228 Memoirs of the Indian Museum. [Voi.. Ill, 



marginal groove incomplete across the middle both before and behind , its anterior 

 extremities merged in a pair of somewhat triangular strongly punctured areas, 

 behind each of which a more or less definite band of punctures extends back parallel 

 to the sides, crossing in their course the upper parts of the two scars, which are 

 also thickly punctured. Median groove very distinct, almost invariably complete. 

 Punctures and hair on lateral plates of lower side of prothorax somewhat sparser 

 than in 0. cantori ; posterior plate of prosternum with a few hair-bearing punctures, 

 anterior plate unusually hairy. Scutellum striato-punctate and pubescent beside 

 greater part of anterior margin, punctures continued backwards on either side of 

 middle line about half way to posterior margin; otherwise smooth and polished. 

 Mesosthoracic episterna polished and punctured above and along anterior margin, 

 dull and unpunctured in posterior angles. Mesosternum striato-punctate in extreme 

 anterior angle; scars dull, small, but continuous behind and on the inner side with a 

 dull and finely punctured area occupying the whole of the lateral angles ; the rest 

 highly polished. Metasternum with lateral areas rough, slightly hairy in front, very 

 narrow, parallel-sided or nearly so; central area extensive, badly defined; anterior 

 intermediate areas somewhat hairy, but rather indistinctly punctured; posterior 

 intermediate areas completely or very incompletely covered with sparsely or rather 

 thickly scattered strong punctures, which are thickest close to the posterior margin. 

 Posterior parts of hind coxae somewhat, scars of abdominal sterna strongly and 

 extensively, roughened or finely punctured. I^ateral grooves of elytra wide, with more 

 or less transversely linear punctures ', dorsal grooves normal; shoulders slightly hairy. 



Genus ACERAIUS, Kaup. 

 Aceraius wallacei (Kuwert). 

 PI. xii, figs. 26-260. 

 Regd. No. '— Kuching, Sarawak Sarawak Museum. 



The Berlin collections include specimens from the Malay Peninsula and from 

 Mt. Kina Balu ; and the Hamburg collection specimens from Somgei Isaiah. 



Description. — Length 32-37 mm. Lahrum hairy, punctured, sides parallel, angles 

 rounded, left angle more pointed but hardly more prominent than right. Antennae 

 with all six lamellae pilose and very long and slender. Upper margin of mandibles 

 behind upper tooth straight or slightly concave ; apex of right upper tooth acute ; 

 left upper tooth acute or truncate, bent over inwards a little; horizontal groove 

 of left anterior lower teeth very pronounced, dividing tooth into two parts of which 

 the upper is often somewhat larger and blunter than the lower ; lowest terminal and 

 anterior lower teeth of right side very small, both dorsal and ventral portions of 

 right anterior lower tooth distinct. Median part of mentum usually with sunken 

 semi-circular area along anterior margin and three or four large punctures behind, 



' See also below, p. 285, footnote. 



