Plocaederus ruficornis: Aurivillius, 1910, Arkiv. Zool., 7(3) : 4. - Gressitt & Rondon, 1970, Pac. Ins. Monogr., 24 : 69, fig. 13h. - Hayashi, 1975, Bull. Osaka Jonan Women's Jr. Coll., 10 : 175. - Hudepohl, 1990a, Entomofauna, 11 (3/1) : 65.

Diagnostic characters : body black; entire antennae reddish, first four segments darker; antennal segment 3 - 9 serrate ectoapically, 5 - 10 compressed dorsi-ventrally, subequal; prothorax roughly corrugated; elytron 3 X as long as broad, basal half rugulo-punctate; apical half subglabrous, punctulate with sparsely white pubescences.

Body black; labrum, maxillary and labial palpi castaneous; entire antennae including scape castaneous; elytra with sparse silvery pubesence, getting denser towards the apex; 3/4 basal half of femora, entire tibiae and tarsus castaneous; 1/4 apical half of femora black; undersurfaces pitchy with dense tawny-grey pubescence.

Head little exserted, triangular; fronts oblique; clypeus coarsely puncture anteriorly, with a elliptical depression; gena short; antennae socket depressed, antennifer coarsely puncture and inner side formed a protuberance; vertex with a median ridge, interrupted a little before upper eye lobe; neck finely granulate except a weak median furrow. Antenna as long as body; scape finely punctulate, widen and bent downward at tip, subtruncate and carinulate ectoapically; remaining segments compressed dorsi-ventrally; segment 3 & 4 slightly and 5 - 10 strongly angulated externally; 5 - 10 evenly covered with pubescence. Prothorax trapezoid; base wider than apex; pronotum irregular rugose; side convex, armed with a sharp spine preceed by a protuberance in front; posterior margin of intercoxal process ends with a blunt node. Scutellum triangular, tip rounded, pubescent. Elytron 3 X as long as broad; disc rugulo­punctate on basal half, finner towards apex, subglabrous and punctulate on apical half, middle slightly dented; narrow gradually halfway towards apex, tip subtransversely truncate; armed with sutural spine and an angular cusp. Undersurfaces finely puncture, very pubescent. Legs : femora subclavate alone 3/4 its length, tapered at tip; mid and hind femora compressed laterally and incurvate; inner side of mid femur verriculate.

Measurement : Length 25.3 mm (); breadth 8.5 mm ()

Distribution : Thailand; Peninsular Malaysia; Sarawak; Philippines.

Known habitat : commonly found throughout Loas especially in the mountains, burned forest and clearing (Gressitt & Rondon, 1970)

Host : Mangifera indica

Note : a complete account of the biology of this species was given by Duffy (1968). Aurivillius (1910) gave a description on this species but mistook it as a species novum, holotype of both specimens should be reexamined to determine if this represents a new homonym. The type locality of Aurivillius's species was given as Kuili in West Africa.

Material examined : 1 [160], Sampling log pond, Tubau, Bintulu Div., 18.II.1995, C. K. Lim. (UNIMAS Coll.)