No. 1.] E. P. Stebbing—On the Bostrichidssofthe Indian Region. 2,7: 



present. In the first the mandibles are more or less attenuated in- 

 their upper halves and nearly always pointed at their tips and when 

 in play they rub over one another, their ends crossing. Even when 

 short and obtuse at the apex they retain their oblique position and 

 their tips do not meet in repose. In the second division the 

 mandibles are shorter and more robust, as wide at their tips as in 

 the middle, truncate at their ends. They move in the same plane 

 and when at rest they meet one another along the whole length of 

 their sides. 



The Bostrichinss with mouth parts built on the first type 

 (oxygnathes) form Lesne's Bostrichinss and Apatinss, those on the 

 second plan (pachygnathes) his sub-tribe Sinoxyloninss. 



The Bostrichinss of the first type divide themselves into two 

 groups of which it is easy to define the limits. The absence of the 

 long and thin ovipositor so constantly present in the females of the 

 Sinoxyloninss and Bostrichinss sens. sir. suffices of itself to 

 justify the separation of the sub-tribe Apatinss as distinct from 

 the other two. 



In the Bostrichinas sens. str. the mesosternum and metasternum 

 meet at the exterior edge of the intermediate coxa except in 8 or 9 

 species where these pieces are only very slightly apart. In the 

 Apatinse the lateral edges of the .meso and meta-sternum are 

 markedly apart. The tarsal joints 2-4 of the Apatinse are 

 furnished near the ends on their under surfaces with dense and 

 regular brushes of hairs. This is rarely found in the sub-tribe 

 Bostrichinss sens. str. 



Sub-tribe Bostrichinss sens. str. 

 I. Bostrichus. 



The sub-tribe Bostrichinss s. str. answers to the great genus 

 Bostrichus as understood by Gu^rin-Me'neville, Lacordaire and 

 J. Duval. The limits of this genus had never been properly defined 

 till Mr. Lesne's memoir appeared. The following are the charac- 

 ters : — 



The labrum always very strongly transverse is at most as wide as 

 the median indentation of the anterior margin of the epistome. The 

 prothorax has no lateral suture and is often prolonged into horns 

 at the anterior angles. Neither the portion of the prosternum situated 

 in front of the anterior coxae, nor the intercoxal lobe of the meso- 

 sternum are thinned out into a blade-like edge. The abdomen has 

 always five visible segments, the first four are simple and it is very 



