Genus Imbrius Pascoe

Imbrius Pascoe, 1866, Proc. Zool. Soc., : 528 (type-species : I.lineatus Pasc., 1866) loc. cit.; 1869, Trans. Ent. Soc. Lond., ser 3, 3 : 518. - Gahan, 1891, Ann. Mag. Nat. Hist., 6 (7) : 22 (loc. cit.). - Aurivillius, 1912, Coleopt. Cat., 39 : 59.

Diagnostic characters : head weakly produced with a deep median sulcus between antennal insertion and upper eye lobe, narrower behind eye; frons laminiform, rough; terminal segment of maxillary and labial palpi truncate; eye large, prominent, upper lobe approximate; antennae little longer than body in both sexes; gula with a transverse groove that feebly curved at side, raised posteriorly with elevated area strongly punctate; antennal scape acutely thicken, apex of 3 - 5 nodose or slioghtly thicken, 7 - 10 angulate externally; prothorax longer than broad, side unarmed, disc deeply rugose; anterior of pronotum with a somewhat semicircular raised area, corrugation behind vigourously interrupted producing several protuding peak or tubercle; elytra coarsely punctate, apex rounded; fore coxal cavity closed; intercoxal process of mesothorax declivent.

Key to species of Imbrius in Sarawak

1.    Apex of antennal segment 3 - 5 distinctively and strongly nodose; segment 3 short, at most subequal to 1 + 2 united; posterior of fore intercoxal process sloping, not tuberculate - ephebus PASCOE, 1866
Apex of anternnal segment 3 - 5 subnodose; segment 3 very long, longer than 1 + 2 united; posterior of fore coxal process vertical, tuberculate. - acutipennis (FISHER), 1935

Imbrius ephebus PASCOE

Imbrius ephebus Pascoe, 1866, Proc. Zool. Soc., : 529 (loc. cit.); 1869, Trans. Ent. Soc. Lond., ser 3, 3 : 519. Aurivillius, 1912, Coleopt. Cat., 39 : 59.

Head, prothorax and elytra fuscous with pale tawny pubescence; antennae fusco-castaneous especially apex of each segment; elytra and undersurfaces clothed with dense and even yellowish-luteous pubescence; legs same color as antennae.

Head triangular with a constricted neck; frons with a deep- sulcus below antennal support, surface uneven; eye large, occupying almost entire lateral side; vertex with a deep median groove passing from between antennae, upper eye lobe and proceed to the neck. Antenna slightly longer than body in ; scape transverse, coarsely punctate and pubescent; segment 3- 5 nodose at apex in , less distinctive in , segment 3 of longer than 4 or 1 + 2 united, only about as long in ; 7 - 10 angulate extoapically, each segment subequal. Prothorax longer than broad; cylindrical; anterior of pronotum with a raised area, behind it transversely and deeply corrugated, sometimes interrupted producing several prominent acanthus. Elytron 5 X as long as broad; parallel; gradually narrow at 1/5 from apex and rounded; disc coarsely punctate, pubescent. Legs: femora fusiform with the base much narrower; 1 and 2 tarsal segments of each legs subequal in length.

Measurement : Length 15 - 18 mm (); 15 - 16 mm ()
 Breadth 3 - 4 mm (); 3 - 3.5 mm ()

Distribution : Sarawak; Peninsular Malaysia (Penang; Malacca); Java; Singapore

Material examined : 6 Matang road, Kuching Div., 9.IV. 1912; Matang road, Kuching Div., 7.X.1909; Matang road, Kuching Div., 18. IX. 1914; Matang road, Kuching Div., 21.IX.1911; Matang road, Kuching Div., 1.XII.1909; Ratuh, Ulu Sadong, Samarahan Div., 15.V.1914 (all SM Coll.).; 2 Matang road, Kuching Div., 13.XI.1909; Buntal, Kuching Div., IV.1903 (all SM Coll.).

Imbrius acutipennis (FISHER)

Dymasius acutipennis Fisher, 1935, J. Fed. Malay States Mus., 17 : 586.
Imbrius acutipennis : Hudepohl, 1989a, Entomofauna, 10 (5) : 51.

Head fuscous with dense tawny pubescence especially around ocular and frons; antennae fascous with sparse tawny pubescence, dense on scape, nodose apex castaneous; prothorax fuscous, tawny pubescence at side of middle; elytra, undersurfaces and legs evenly clothed with pale-luteous pubescence.

Head highly raised between antennal insertion with a wide median groove; a small carina inside the latter; frons short, transverse with 2 deep foveae side of middle below antennal support. Antenna longer than body in both sexes; scape gradually widen at apex, very pubescent and punctate; segment 3 long, almost 2 X as long as 4; apex of 3 & 4 subnodose; 5 distinctively longer than 4, little shorter than 3; 6 - 10 angulate ectoapically in , less so . Prothorax with a V-shaped groove behind anterior constriction; 1.5 X as long as broad; pronotum deeply rugose, middle with several pointing but irregular-shaped tubercle, side vermicular; posterior end of fore intercoxal process tuberculate. Elytron 4 X as long as broad; parallel, gradually curved at 1/6 from apex; tip rounded, subtruncate near suture; disc evenly punctate and pubescent.

Measurement : Length 29 mm (); 15 mm (); 
Breadth 7.5 mm (); 6 mm ()

Distribution : Sarawak; Sabah

Material examined : 1 Santubong, Kuching Div., V.1902 (SM Coll.); 1 Matang, Kuching Div., 22.III.1911 (SM Coll.).