40 Indian Museum Notes. [Vol. VI, 



uncipennis, Leslie, 1895, An. Fr. 1895, P* *73 ( o* ?)• 

 fpapuensis, MacLeay, 1886, Proc. Linn. Soc. N. S. W., 2nd Ser., 



P- 154 ( ? )• 



Bostrichus aequalis, Ind. Mus. Not, V. 1, 34. PI. Ill, fig. 7. 



Lesne, An. Fr., 1898, p 560. 



Long. 6 — 13 millim. Parallel, very slightly depressed, of a more 

 or less dark brown colour, often rufous, glabrous beneath; thighs 

 often reddish. Forehead and epistome rasp-like, the punctures being 

 irregularly distributed with very short and not thick pubescence. 

 Elytra strongly and densely punctuate, the pits arranged in fairly 

 regular rows of striae j punctuation of the apical declivity variable. 

 Apical edge of the elytra turned back and furnished with a border 

 thickened laterally and separated from the edge of the elytra. 

 Abdomen with a very firm and very dense punctuation, rasp-like, its 

 pubescence very fine, and not easily perceivable. Second tarsal joint 

 of hind legs much shorter than the last. Most of the different sexual 

 characteristics have been given above. Heteromorphous $ . The pro- 

 thorax is sometimes wider than the elytra, its posterior angles not 

 being, or only very slightly, lobed and the tooth of the interior angles 

 is generally more prominent than in the other forms. The spacing 

 of the large sunken pits on the posterior surface of the pronotum 

 allows of the ground sculpture being seen which appears like imbri- 

 cate scales, shining, and with finely marked contours. Apical decli- 

 vity of elytra shows on either side on its upper edge, a longish tooth, 

 slightly inclined towards the long axis of the body and curved 

 inwards above. Outside of this sort of uncus is a costiform callosity. 1 



In the ? prothorax is smaller, its posterior angles are nearly 

 always lobed ; the deep pits which cover the posterior surface of the 

 pronotum are so close together as to obliterate any other sculpture. 

 On either side of the upper edge of the apical declivity of the 

 elytra there are only two costiform callosities, very little prominent. 



Males are to be found much smaller than the ordinary 

 heteromorphous $ and having a proportionately smaller prothorax 

 resembling that of the ? . In these the elytral tooth is short and not, 

 or hardly, curved or it may even be replaced by a simple prominent 

 edge. 2 But this homeomorphous form is not fixed and all gradations 

 are found. 



Further, this elytral tooth of the $ , even when well developed, is 

 very variable. More or less wrinkled and punctuate at its base, it 

 is at times simple, regularly arched and thinned out at its tip, or it is 

 furnished near the middle of its posterior face with a tubercle which 



1 These elytral teeth and callosities are similar to those of the males of 

 H. unicornis and pileatus and similar ones are not to be found in any other 

 Bostricriids. 



1 One specimen from Soembawa (Coll. Bedel). 



