Genus Xylotrechus Chevrolat

Xylotrechus Chevrolat., 1860, Ann. Soc. Ent. Fr., ser 3, 8 : 456 (type-species : X. sartorii Cherv.) loc. cit. Pascoe, 1869, Trans. Ent. Soc. Lond., ser 3, 3 : 606. - Gahan, 1906b, Fauna British India, Col. 1 : 241. - Gressitt, 1940, Philip. J. Sci., 72 (1-2) : 67.; 1951c, Longicornia 2 : 231.; 1959, Pac. Ins., 1 (1) : 158. - Gressitt & Rondon, 1970, Pac. Ins. Monogr., 24 : 194.

Amauresthes Chevrolat, 1863, Mem. Soc. R. Sci. Liege, 18 : 327, Part. loc. cit. 

Xyloclytus Reitter, 1912, Fauna Germ., 4 : 46, note 3 (type-species : Clytus chinensis Cherv.) loc. cit

Diagnostic characters : frons with one or more branching carinae; vertex and frons without distinct boundary; antennae inserted under prominent lateral edge or carinae that continued downwards along each side; antennal support slightly narrower than lateral genal margin; antennae shorter than body in both sexes, not extending beyond 1/3 of elytral base, generally few basal segments (3 - 5 or 3 - 7) setose or spined pre-endoapically; prothorax cydariform to oblong-oval.

Key to species of Xylotrechus in Sarawak

1.    Lateral carinae of frons prominent; altogether 5 carinae on frons, 2 median united  to from a V-shaped mark, 1 on vertex, 2 laterad near eyes. ……...2
Lateral carinae of frons not prominent or ridged ......……………………..4

2(1) Lateral ridge on frons short, not extending beyond anterior of upper eye lobe, abreast with ocular margin; prothorax cydariform; antennae short, not exceeding posterior margin of prothorax . ………………………………..3
Lateral ridge on frons extending to mandible, raised and distanced from frontal ocular margin; prothorax longer than broad; antennae extended to 1/3 of elytra from base. - pedestris PASCOE, 1869

3(2) Head with 5 carinae, the one on vertex distinctive; lateral dark brownish   patch on prothorax segregated, not contiguous with apical. or basal end; apex of 2nd elytral band curved posteriorly, not reaching external margin; femora entirely castaneous - brevicornis PASCOE, 1869
Head with 4 distinctive carinae, the one on vertex obscure; lateral brownish patch on prothorax large, joined to basal margin; 2nd elytral band transverse, parallel to 3rd, both reaching external margin; 1/3 basal of mid and hind femora testaceous, the rest castaneous .- Xylotrechus brevicornis GAHAN ferebrevicornis subsp. nov.

4(1) Carinae on frons clearly visible or not obscure by dense pubescence; prothorax semi pubescent with blackish spots; elytra black with ashey to lacteous bands or markings. .....……........…….…………………………5
Entire frons extremely pubescent with decumbent hairs obscuring carinae;  prothorax and wlytra densly clothed with lacteous pubescence, the latter with 3 fuscous markings or 4 lacteous elytral bands. - discors GAHAN, 1906

5(4) Median of frons with 4 carinulae extending to clypeus …..........………….6
Median of frons with only 2 parallel, approximate carinulae, not extending  below lower eye lobe. …………………......…………………………..…7

6(5) Frons as broad as long; median carinae on frons bifurcate, the two at side   widely separated and excurved at both ends; elytra at most 2.5 X as long as prothorax; transverse basal elytral band narrow, more like a greyish shade; apex roundly emarginate with angular and sutural spine though both very weak - hypoleucus PASCOE,1869
Frons longer than broad; carinae on frons more of quadri-furcate from a single stem at clypeus; body elongated; elytra 3.5 X as long as prothorax; basal elytral transverse band wide, distinctive; apical tip roundly dehiscent, not dentate; apex rounded with an obscure tooth at outer margin - consocius GAHAN, 1906

7(5) Prothorax with a median longitudinal ashey stripe; 3rd elytral band behind middle crescentric; deflexion of basal band straight; entire mesosternum clothed with chalky-white pubescence; hind femora not carinate - longitudovirgatus sp. nov. 
Prothorax without a median longitudinal stripe; 3rd elytral band behind middle more triangular; deflexion of basal band oblique; posterior end of episternum of mesothorax with a whitish fascia; mid femora carinate - decoratus PASCOE, 1869

Xylotrechus pedestris PASCOE

Body overall castaneous; head castaneous with evenly distributed white pubescence, denser on gena and gula; molar black; antennae entire fusco-testaceous, last 4 - 5 apical segments teataceous or whitish; prothorax dark castaneous, entirely clothed with minute dense white pubescence except three investitus fuscous spots; median one slightly elongated, a little behind middle; laterad one circular, on each side of middle; elytra fusco-testaceous with pale whitish bands and markings; undersurfaces covered with dense whitish pubescence; femora castaneous, sparse pubescence whitish; tibiae fuscous.

Head short, subvertical, front curved; labrum and clypeus at same plane; the latter explanate, punctate; frons concave, with a raised anterior carina that bifurcate a little behind anterior ocular margin; another faint median carina arise from in between, continued to vertex and terminate behind posterior margin of upper eye lobe; gula slightly convex, strongly angulated with ventral of temple; vertex coarsely granulated; antennal socket conceal by a strongly raised lateral ridge that extended to the anterior, circumscribe beside inner ocular margin and then excurved to base of mandible; eye equidistantly notched, upper lobe about the same side as lower. Antenna shorter than body, not extending beyond 1/4 from base of elytra; scape barely reaching anterior of prothorax, as long as segment 3; 3 distinctively longer than 4; 5 subequal to 3; remaining gradually decreased in length; apical. segment acute. Prothorax longer than broad; broadly ovate, anterior narrower than base, with a glabrous annular girdle at apex; the widest at 1/3 from base; disc concave; side rounded; pubescent area coarsely punctate; interstice pubescent; punctures glabrous; three investitus fuscous patches granulo-striate; prosternum convex. Elytron 5 X as long as broad; subparallel; truncated at apex with an angular tooth; apical margin rounded; disc with 4 bands; 1st basal, transverse and indistinctive, bend on reaching humeral angle and curved posteriorly, the outer edge concave or rounded; 2nd wide, about 1/3 width of elytron, proceed from scutellum along suture, oblique outwards at 1/3 from base touching the humeral stripe, become narrower and again abruptly inclined latero-posteriorly towards the outer elytral margin; 3rd triangular, anterior margin oblique, tip touching suture at middle, posterior margin transverse; 4th apical, forming a large roundish patch. Legs compressed laterally; fore femora 1/2 as long as mid femora; apical half of latter fusiform, base decurved and pedunculate; hind femora subparallel, feebly widen towards apex, reaching tip of elytra; first hind tarsal segment strongly compressed, very long, 3 X as long as 2 + 3 united.

Measurement : Length 10.0 - 15.0 mm; breadth 2.5 - 4.0 mm.

Distribution : Sarawak

Note : the description was also based on an old specimen and thus the color faded. The original description described the body ashy in color, antennae and elytra blackish. This species can be easily distinguished by the carinae on frons, the oblong-ovate prothorax, the three dark brownish spots in the pronotum, the marking on elytra and the strongly compressed first hind tarsal segment that is 3 X as long as 2 + 3 united.

Material examined : 1 specimen, [FN 79-0185], Sematan (State land), Lundu, Kuching Div., 20.VI.1979, Mercer (For. Dept. Coll.); 24 specimens, all in SM Coll. : Kuching, Kuching Div., 5.V.1903; Matang Road, Kuching Div., 4.XII.1909; Mt. Merinjak (2200 ft), 28.V.1911; Kuching, Kuching Div., 18.II.1914; Matang Road, Kuching Div., 9.IV.1910; Matang Road, Kuching Div., 7.III.1910; Kuching, Kuching Div., 10.I.1902; Serambu, near Bau, Kuching Div., I.1912; Mt. Murud, ulu Barain, Miri Div., XI-XII, 1912; Kuching, Kuching Div., 25.VIII.1899; Kuching, Kuching Div., 23.IV.1900; Matang Road, Kuching Div., 24.IV.1910; Kuching, Kuching Div., 19.V.1903; Kuching, Kuching Div., 19.V.1903; Baram, Miri Div., 13.X.1910; Kuching, Kuching Div., 5.V.1903; Matang Road, Kuching Div., 14.X.1909; 4th mile Rock Road, Kuching Div., 7.V.1909; Mt. Murud, ulu Baram, Miri Div., XI-XII,1914; Matang (2800 ft), II.1902; Kuching, Kuching Div., 26.VI.1899; 4th mile Rock Road, Kuching Div., 20. IV.1909; Matang Road, 4.VI. 19 10; Kuching, Kuching Div., 1. IV. 1903.

Xylotrechus brevicornis PASCOE

Xylotrechus brevicornis Pasc., Trans. Ent. Soc. Lond., ser 3, 3 : 608. - Aurivillius, 1912, Colelpt. Cat., 39 : 365. - Gressitt, 1951b, Ann. Ent. Soc. Amer., 44 (1) : 206.

Body fuscous to pitchy; head pitchy with flavo-albus pubescence; maxillary and labial palpi, base of mandible, labrum, clypeus and entire antennae castaneous; on prothorax pale infuscate to flavoviren with grayish tinge; pronotum with three fuscous patches, the median oblong, another separated one on each side of middle; scutellum lacteous with olivaceous tinge; elytra fusco-piceous with flavotestaceous markings; undersurfaces fuscous with flavo-albus pubescence except epimeron of meso- and metathorax, middle of metathorax, an anterior triangular notch on episterna of metathorax and middle of all abdominal segments; femora and tibiae fuscous with grayish pubescence; all tarsus castaneous.

Head very short, very much rounded in front if view from side; mandible triangular; clypeus trapezoid, oblique with forns, suture with labrum obvious, narrower at apex; upper gena very short, widen ventrally because of oblique lower ocular margin; mentum at right angle with gula, as if anterior of head abscissus; frons with two median carina that united between eye lobe to form a V-shaped mark, continued towards anterior in a strongly raised and decurved ridge; lateral ridge near antennifer strongly produced, obscuring antennal condyle, extended anteriorly circumscribe very near inner ocular margin and extenuate upon gena; all carinae glabous, interstice very pubescent; vertex with a short median carina. Antenna very short, last two apical segments extended beyond elytra; scape decurved at apex, a little longer than segment 3; 3 distinctively longer than 4; endoventrally cirrose on segment 3 - 6. Prothorax cydariform; as broad as wide; abruptly rounded near base; entirely granulated and pubescent; pronotum with a median longitudinal oblong patch that widen posteriorly, extending to but not touching apex and ends slightly before basal margin; sides of middle with a separated guttiform patch each, anterior boundary rounded, antenuate posteriorly to a sharp point. Scutellum semicircular. Elytron 4.5 X as long as broad; narrower towards apex, transversely truncate; angular spine obscure; disc with 5 bands; 1st transverse, extended along basal margin until ventral of humeral protuberance; 2nd subtransverse, curved backwards at 2/3 from suture; 3rd at middle, transverse but not reaching external margin, posterior margin curved near suture; 2nd and 3rd united along suture; 4th a little more than 1/3 from apex, transversely triangular; 5th apical, margin oblique to angular spine. Undersurfaces : anterior and posterior margin of metathorax densely pubescent, middle bare; episterna of metathorax very pubescent except the anterior triangular notch; pubescence congregated at side of abdominal segments; only tip of last abdominal segment extended beyond elytra. Legs : basal half of mid femora pedunculate, apical half fusiform; hind femora subfusiform, base narrower, apex not reaching tip of elytra; first hind tarsal segment 3 X as long as 2 + 3 united.

Measurement : Length 10.0 - 15.0 mm ; breadth 2.5 - 4.0 mm.

Distribution : Sarawak

Material examined : 1 [FN 87-0524] Beluru forest Reserve, Forescom, 15.VIII.1987, Lippa Akeng (For. Dept. Coll.); 8 specimen, all in SM Coll. : Mt. Murud, ulu Baram, Miri Div., XI-XII. 1914; Kuching, Kuching Div., 25.X.1897; Mt. Sibau, Balai Ringin Protected Forest, Samarahan Div., V-VI.1902; Kerpok Hill, near Banting, Sri Aman Div., 24-25.V.1909; Mt. Murud, ulu Baram, XI-XII.1914; Lundu, Kuching Div., 21.X.1909; Siol, Petra Jaya, Kuching Div., 20.VI.1910; Mt. Murud, ulu Baram, Miri Div., XI-XII.1914.

Xylotrechus brevicornis GAHAN ferebrevicornis sp. nov. 

Head very short, rounded in front; molar truncated; labrum and clypeus fit entirely in between mandible when close, both glabrous with few bristles; gula deflexed; mantum oblique, as if anterior of head truncated; frons with a broad longitudinal median carina, not strongly raised, punctate and bifurcate a little in front of canthus; weakly granulo-striate between furcae; lateral ridge conspicuous, circumscribe inner ocular margin and extenuate near gena; interstice of these ridges densely and uniformly pubescent; vertex with a weak and short median carina, pubescent; neck very short, reticulo-punctate. Antenna short, barely reaching elytra in ; scape as long as segment 2 & 3 combined; 4 & 5 subequal, half as long as 3; 3 - 6 spined endoapically. Prothorax cydariform; side abruptly rounded at base; widest 1/3 from base; anterior with an annular ridge; pronotum with a median oblong investitus patch that widen posteriorly, not reaching basal margin but touching the apical; each side with a large suboval patch, abscissus posterior-ventrally; these patches coarsely granulate; area in between densely pubescent. Elytron 4.5 X ,is long as broad; truncated at apex with a weak angular cusp; disc with 5 bands; 1st basal, transverse, not extending to humeral protuberance; 2nd transverse, not reaching external margin, tip abruptly bent at right angle; 3rd at middle, acuminate outwards; 2nd and 3rd joined along suture; 4th 1/3 from apex, wide at suture, tapering towards middle, slender and feebly inclined Posteriorly after that, not reaching outer margin; 5th apical, narrow, margin oblique. Undersurfaces : those fuscous portions punctulate and sparsely pubescent; posterior margin of abdominal segment 4 reaching apex of elytra, last segment totally exposed. Legs : fore femora fusiform; base of mid and hind femora pedunculate; apical half of former subfusiform, the later clavate; first hind tarsal segment 2.5 X as long as 2 + 3 united.

Holotype (For. Dept. Coll.) [FN 81-0392] Kengana P.I.L3.,Tg. Tawong, Mukah, Sibu Div., 13.VII.1981, Mercer et. al. Length 13.7 mm; breadth 3.4 mm.

Syntype (SM Coll.) 17 specimens : Matang Road, Kuching Div., 7.V.1915; Kuching, Kuching Div., 16.X.1899; Matang Road, Kuching Div., 7.V.1913; Matang Road, 7.V.1913; Matang Road, Kuching Div., 7.V.1913; Kuching, Kuching Div., 13.II.1914; Matang Road, Kuching Div., 7.V.1913; Matang Road, Kuching Div., 1.XII.1909; Kuching, Matang Road, Kuching Div., 7.XII.1915; Bukit Kuching Div., 13.II.1914 Sap, 19.VI.1913; Matang Road, Kuching Div., 7.V.1913; Matang Road, Kuching Div., 24.XI.1915; Matang Raod, Kuching Div., 24.VI.1910; Bukit Sap, 19.VI.1913; Matang Road, Kuching Div., 2.XII. 1909; Baram, Miri Div., 15.X.1910. Length 9.0 - 12.0 mm; breadth 2.2 - 3.5 mm.

Distribution : Sarawak

Note : Very similar to X. brevicornis at first look but differ in (i) maxillary and labial palpi of this species being testaceous, (ii) the lateral patches on prothorax that is abscissus posterior-ventrally at basal margin and large size that almost cover entire side, (iii) middle of mesosternum that is investitus, (iv) more well defined triangular patch on episternum of metathorax, (v) unique markings on abdominal segments that has a bisinuate border, (vi) the base of middle and hind femora is honey yellow, (vii) the 1st basal elytral band not extending under humeral protuberance, (viii) the 2nd transverse band only abruptly bent at tip and (ix) sutural half of 3rd acuminated instead of curved. 

Xylotrechus discors GAHAN

Xylotrechus discors Gahan, 1906a, J. Fed. Malay States Mus., 1 : 112, p1.VI, fig. 2.; Gahan, 1907, Ann. Mus. Genova, 3 (3): 73 (loc. cit.). - Aurivillius, 1912, Coleopt. Cat., 39 : 365.

Head and prothorax black, with dense lacteous pubescence; pronotum with a short median blackish median stripe near to base; antennae dark fuscous with dense whitish pubescence, apical segments more ferrugineous; scutellum. with apical margin chalky-white, base fuscous; elytra black with lacteous and fuscous pubescence; the former occupying larger percentage; undersurfaces entire and extremely densely clothed with lacteous pubescence; fore and mid coxae ochraceous; femora and tibiae black.

Head elongated, vertical; lateral margin of frons parallel between eyes and antennal support, widening to gena; frons with 2 carinae side of median, diverge towards antennifer; vertex coarsely punctate, especially around ocular. Antenna shorter than body, extended to 1/2 of elytra; scape long, reaching apical margin of prothorax; segment 3 & 4 subequal, as long as scape; 5 longest, slightly longer than scape; 1/4 apex of segment 11 apiculate. Prothorax longer than broad; apex as wide as base; both narrower than elytra; pronotum with a investitus but granulated median stripe behind middle, this being gibbose. Scutellum semicircular; apical margin pubescent; base investitus, finely punctulate. Elytron 7.2 X as long as broad; parallel; tip broadly rounded, not spine or dentate; 4 lacteous band almost covered entire disc; 1^st basal, broad and transverse, 4 X as deep as scutellum.; 2nd broad, conected to former along suture, sloping, anterior broder biemarginate, leaving a sharp point at deflexion, posterior border ablique-straight; 3rd campanulate; 4th apical, connected with 3rd along suture; all bands approximate. Legs : 1/5 of hind femora extended beyond elytral apex.

Measurement : Length 13.0 mm; breadth 2.5 mm.

Distribution : Peninsular Malaysia; Sabah.

Note : this pecies was collected from Sabah. 

Material examined : 1 specimen, Mt. Kinabalu (4500 ft), Sabah, 4.X.1913 (SM Coll.).

Xylotrechus hypoleucus PASCOE

Entire head black, semi investitus with few scattered ashey pubescence; 4 basal antermal segments fuscous; 5 - 11 whitish pubescence; prothorax with a faint broad transverse fuscous patch; scutellum white; elytra black as ground color, clothed with blackish to fuscous pubescence, bands made of ashey pubescence; prosternum with denser whitish pubescence; posterior end of episternum of mesothorax, entire episternum of metathorax, latero-ventral of abdominal segment 1 & 2 with dense chalky-white pubescence; epimeron of mesothorax impubis, fuscous; legs fuscous; femora with long hairy ashey bristles; tarsus ochraceous.

Head short, broad; smoothly curved at side profile; mandible short, very much retracted, semicircular when closed pair-wise; labrum very small, narrow; clypeus and frons contigeous, sulcus not distinctive, occupying entire frontal of head; the latter rectangular, wide, paralled-side and carinate at side; frons with 4 carinulae, median one elongated Y-letter, another 2 side of median, all widely separated, interspace subglabrous to sparsely punctulate with thin scattered pubescence. Antenna shorter than body, extended to 1/3 of elytra; segment 2 half to 1/3 of scape; 3 a little longer than scape; 4 & 5 subequal to scape; 6 - 11 cylindrical, gradually shorten; 11 rounded at apex. Prothorax as long as broad; ovate; widest part at middle, as wide as elytra; side roundly convex; base narrower than elytra; disc convex dorsally; both ends not constricted but with a small annular ridge; pronotum granulate. Elytron 6 X as long as broad; parallel sided; tip roundly truncated, emarginate near weak angular and sutural tooth; lst band transverse along base, indistinctive, more like a greyish shade, circumscribe scutellum; 2nd begin from scutellum, excurved to 1/4 of base, posterior border transverse; 3rd a little behind middle, wider at suture, anterior border oblique, posterior border sinuate; 4th apical, round spot. Legs : fore and mid femora gradually widen towards apex; hind femora long, rod-liked; all finely punctulate with fine pubescence and scattered long hairy bristles; tibiae linear.

Measurement : Length 7.0 - 11.0 mm; breadth 1.5 - 2.2 mm.

Distribution : Sarawak; Aru; New Guinea.

Material examined : 2 specimens, all in SM Coll. : Kuching, Kuching Div., 12.IX.1900; Matang Road, Kuching Div., 12.XII.1910.

Xylotrechus consocius GAHAN

Xylotrechus consocius Gahan, 1906a, J. Fed. Malay States Mus., 1 : 111 (Malacca), pl.VI, fig. 3. - Aurivillius, 1912, Coleopt. Cat., 39 : 365.

Head black, entirely covered with ashey pubescence; antennae blackish fuscous; 4 - 5 apical segments yellowish-ferrugineous, all segments with whitish pubescence, denser towards apex; prothorax black, dense ashey pubescence; pronotum with 3 fuscous dots, 2 at middle of side of median, 1 at basi-median, all united to form a somewhat T-shaped mark; scutellum white; elytra black as ground color, marking made of ashey and blackish pubescence; entire mesosternum and abdomen clothed with whitish pubescence except for the ventral surface of 3 basal sterna.

Head vertical, narrower than prothorax; gena and mandible long; clypeus and frons at same plane, rectangular; frons with 4 carinae branched off from a stem near clypeus, medial two parallel, outer 2 diverge; few scatered dark impubis spots below lower eye lobe; similar dots on vertex. Antenna shorter than body, extended to 1/2 of elytra. Prothorax oblong-cylindrical; 1.5 X as long as broad; narrower than elytra; disc coarsely granulate especially along median. Scutellum squarish; posterior edge rounded. Elytron elongated; 7 X as long as braod; parallel-sided; apical tip roundly dehiscent with an obscure angular tooth at the outer margin; apex rounded; disc with 4 ashey bands; 1st basal, 2 X as deep as scutellum, transverse; 2nd broad, transverse, at 1/3 from base, connected to former band by a narrow slightly curved stripe along suture; 3rd triangular, wider at suture, anterior border bisinaute, posterior border feebly attenuate at suture; 4th apical, oblong, 1/5 of apex, border terminate at puter angular tooth; all 4 bands widely distant.

Measurement : Length 10.0 mm; breadth 2.0 mm

Distribution : Sarawak; Peninsular Malaysia (Malacca). 

Note : differ from hypoleucus by the more elongated body, the carinae on frons, the basal and 3rd elytral bands and lastly the roundly dehiscent apical tip.

Material examined : 1 specimen: Mt. Murud, ulu baram, Miri Div., XI-XII, 1914 (SM Coll.).

Xylotrechus longitudovirgatus sp. nov.

Head about as long as broad; mandible pubescent at base; clypeus feebly oblique with frons though sulcus obscure, finely punctulate and pubescent; lateral margin of frons constricted between eyes, gradually widen towards gena, moderately pubescent with 2 approximate median carinae, carinae more distinctive between antennal support and diverge at vertex; the latter with another median carina. Antenna shorter than body, exserted to a little more than half of elytra; slender, filiform; scape thinly pubescent; segment 3 slightly than scape; 4 subequal to scape; 5 subequal to 3; 6 - 11 gradually shorten. Prothorax shortly-ovate; constricted at base with a transverse fascia that continue ventrally to coxae; widest part at 2/3 from base, gradually narrow to apex; longitudinal median stripe on pronotum extended from basal fascia to middle where it suddenly becomes much narrower and continue to apex. Scutellum semicircular. Elytron 6 X as long as broad; parallel, gradually curved at 1/4 from tip; apex obliquely truncate with an angular cusp and a weak sutural spine; feebly dehiscent at sutural tip; disc with 4 bands; 1st extended transversely from scutellum along base to humeral angle where it abruptly bent and continued longitudinally to before middle; 2nd narrow, begin behind scutellum. (not touching it) along suture and obliquely excurved and attenuate outward but not reaching external margin; 3rd behind middle, triangular, anterior joining 2nd band by a very narrow sutural stripe, posterior border transverse; 4th at 1/5 of apex, getting narrower towards tip, outer border terminate at sutural tooth; all elytral bands not reaching external margin. Undersurfaces : intercoxal process of mesothorax 3 X to 4 X wider than fore intercoxal process. Legs : fore femora subfusiform; mid femora peduncle-clavate; hind femora sublinear, gradually widen towards apex; first hind tarsal segment 2 X as long as 2+3 united.

Holotype (SM Coll.) Kuching, Kuching Div., 20.VII.1900. Length 11.0 mm; bredth 2.5 mm.

Allotype 1 (SM Coll.) Sadong, Samarahan Div., VIII.1903. Antennae extended to 2/3 of elytra. Length 9.0 mm; bredth 2.0 mm.

Paratype 3 (SM Coll.) Serambu, near Bau, Kuching Div., I.1912; 2 ex. (same locality) Tuesan ?, VIII.1900. Length 10.0 - 11.0 mm; breadth 2.0 - 2.5 mm.

Note : differ from decoratus in having a longitudinal median stripe on pronotum, 1st  basal band contineous; 3rd triangular, joining 2nd by a narrow sutural stripe, less prominent angular spine and a more parallel elytra.

Xylotrechus decoratus PASCOE

Head black with whitish pubescence; maxillary and labial palpi, labrum, mandible and anterior of clypeus castaneous; antennae fusco-ferruginous, castaneous with dense whitish pubescence towards apex; prothorax fuscous, densely cover with pale lutescent pubescence except three investitus fuscous patches, one median of pronotum and one each at anterior of sides; scutellum lacteous; elytra black with mixture of lutescent and fuscous pubescence; the fomer forming unique markings with pale olivaceous tinge while the latter produce a reddish tinge according to lighting; undersurfaces generally fuscous with dense lacteous pubescence, denser on posterior edge of prosternal epimeron and epipleura of metasternum, forming an oblique and horizontal albus band respectively; entire fore and middle coxae covered with lacteous pubescence; femora and tibiae fuscous with similar pubescence.

Head slightly exserted, fronts oblique, ventral acutely angulated below lower eye lobe; labrum and anterior of clypeus impunctate, bare; gena deep, anterior margin roundly notched; frons with two parallel approximate carinae between eye, united and extenuate in front, terminated at posterior end of upper eye lobe; antennal insertion depressed, emarginate with a crescentric clavus region in front; inner antennifer margin feebly ridged, continued around inner ocular margin and inclined outward touching base of mandible; vertex acutely deflex with frons, coarsely punctate and pubescent; neck very short. Antenna shorter than body, not extending beyond 1/3 basal of elytra in ; scape cylindrical, closely punctulate, 1.5 X longer than segment 3, posterior reaching prothorax; 3 - 5 subequal; remainder gradually shorten; first five basal segment moderately pubescent, remaining clothed with dense pubescence; ventral surface with rows or tuft of apical bristles. Prothorax as broad as wide; cydariform; disc concave, anterior with a complete annular ridge, posterior with discrete margin; coarsely punctate and somewhat reticulate; the longitudinal pronotal fuscous patch dilated at middle with circular postero-lateral periphery; the laterad oblique, subelliptical; area in between at each side forming whitish stripe, broader at base, strongly constricted and aduncate inwards in front, diverged at right angle at apex and combine with the prosternal pubescence below; prosternum declivent anteriorly. Scutellum transverse, posterior margin ovate. Elytron 5 X as long as broad; gradually narrow towards apex; obliquely truncated with a sharp spine at angle; disc with 5 bands; 1st basal, begins from scutellum and extended transversely half of elytron; 2nd longitudinal stripe from humeral angle running obliquely to the middle; 3rd not touching scutellum, longitudinally along suture, bent at right angle externally and slightly curved upwards at apex enclosing the 2nd a little before outer margin; 4th cresentric with the other half, pointing backwards, posterior edge rounded near suture; 5th apical, oblong, 1/3 of apex, outer boundary reaching angular spine. Undersurfaces : anterior of episterna of mesothorax investitus, punctate. Legs compressed laterally especially middle and hind pairs; evenly pubescent; mid femora accrescent, subelavate; hind femora sublinear; external side of both with a glabrous line running from base to apex; first hind tarsal segment slightly longer than 2 + 3 united.

Measurement : Length 10.5 - 12.0 mm.; breadth 2.5 - 3.0 mm.

Distribution : Sarawak; Singapore.

Note : the redescription was based on a aging specimen. Thus the coloration might have a slight difference with the original one. The lacteous color of undersurfaces might be result of fading from the original described lemon-yellow color. This is also true for the color of elytra which might be of pure black in the case of fresh specimen.

Material examined : 1 specimen, [FN 87-1121] Hose Mt., kapit Div., 28.IX.1987, Lippa Akam (For. Dept. Coll.); 15 specimens in SM Coll. : Mt.Merinjak (2200 ft), 28.V.1914; Mt.Merinjak (2200 ft), 27.V.1914; Mt.Merinjak (2200 ft), 26.V.1914; Mt.Merinjak (2200 ft), 23.V.1914; Quop, Samarahan Div., III.1914; Kuching, Kuching Div., 18.II.1914; Kuching, Kuching Div., 18.II.1914; Baram, Miri Div., 15.X.1910; Matang Road, Kuching Div., 10.VIII.1913; Santubong (2600 ft), Kuching Div., II.1900; Penrissen, Kuching Div., V.1898; Matang Road, Kuching Div., 24.VII.1909; Melinau, near Mt. Mulu, Miri Div., 8.XI.1910; Penrissen, Kuching Div., V.1899; Tzesan ?, VIII.1900.