No. 1. ] E. P. Stebbing—On the Bostrichidae of the Indian Region. 39 



larger than in unicornis ; prothorax is narrower, anterior angles less 

 well-defined, posterior angles are more widely curved. Hairs on the 

 anterior tarsi double the length. Abdominal punctuation finer. 



Heteromorphous <$ : Head and prothorax larger than in ? . Fore- 

 head simple, smooth and shining in the middle. Anterior angles of 

 the prothorax each furnished with an uncus which bounds on either 

 side a median narrow and shallow indentation. The lower marginal 

 tubercle of apical declivity of the elytra only slightly developed, 

 compressed and not conterminous with the lower edge, the upper 

 tubercle much larger, prolonged into a horn curved downwards and 

 inwards. 



For the description of the homeomorphous £ l see above under 

 description of group. 



Distribution. — India : Canara (Bombay Presidency) ; Tharra- 

 waddi (Burma). 



Coll. Ind. Mus. Calc, — Cochin. 



Life~History. — Nothing appears to be known at present. 

 Group II. — Forehead similar in the two sexes. Epistome- 

 convex and a little swollen. The frontal clypeal suture obsolete and 

 not sunken in the middle. Anterior angles of epistome obtuse, not 

 prominent but pointed at the top. Eyes slightly turned upwards 

 behind. Posterior angles of the prothorax marked, often lobed. 

 The posterior surface of the pronotum showing deep impressed pits 

 and adorned in the middle with a more or less defined sculpture 

 resembling imbricate scales. Apical edge of the elytra prolonged 

 and slightly turned back. Fifth abdominal segment fringed with 

 long rufous hairs in the middle of its posterior margin. Second tarsal 

 joint of posterior feet shorter than the last. 



Heteromorphous $ : Prothorax larger, the posterior surface of 

 the pronotum with very scattered punctuations. Apical declivity of 

 elytra furnished above on each side with two marginal tubercles 

 of which the inner one is hook-like. 



? . Prothorax smaller. The posterior surface of the pronotum 



densely punctuate. Apical declivity of the elytra without marginal 

 tubercles. 



Homeomorphous 6*: Prothorax as in the?. The inner upper 

 marginal tubercle of the apical declivity much less developed than 

 in the heteromorphous c? . Only one species as yet described— *H. 

 aequalis. 



14. Heterobostrichus aequalis, Wat. 



Waterhouse, 1884, Proc. Zool. Soc. Lond., 1884, p. 215, PI. XVI,, 



f-3 (2) (?)• 



1 One specimen taken at the Seven Pagodas, Tonkin. 



