JJo. 1] E,P. Stebbing — Onthe Bostrichidae of the Indian Region. ig 



Life-History. — Little is known upon this subject. Mr. Lesne 

 states that the discovery of a Heterarthron in the Old World is a most 

 remarkable one, since all that was known about the Polycaoninae 

 pointed to their being of exclusively American origin. The species 

 above described is a perfectly typical Heterarthron, but markedly 

 distinct from the other known species. It is closely allied to the 

 South American forms, H. rufpes, H. gracileps and H. parvidens, 

 from which it chiefly differs in the absence of all bordering ridge 

 •or keel on the apical declivity of the elytra and by the simple labium 

 of the male. 



Mr. Lesne suggests that appearances are in favour of this 

 species being a recently introduced one into Asia. Personally I am 

 more inclined to the idea that research will not improbably bring to 

 light further specimens in Burma and perhaps Southern Madras. 



BOSTRICHID/E HYPOCEPHAL^. 



Tribe. DlNODERlN^;. 



(See Tabl. des tribus 1*, 3.) 



Lesne. — Ann. Soc. Ent. Fr. LXVI, 1897. 



The tribe is divided into four genera — Dinoderus, Rhizopertha, 

 Stephanopachys, and Prostephanus — of which representatives of only 

 the former two appear to have been reported from the Indian 

 region. 



The following is the portion of Lesne's generic table referring to 

 these two :— 



TABLEAU DES GENRES. 

 1-4 — Front indistinct on notablement plus court que l'epistome. 

 Suture laterale prothoracique tonjours bien marquee en 

 arriere. 

 2-3— Front indistinct. Deuxieme article des antennes plus court 

 que le premier. Dernier segment ventral apparent de 

 l'abdomen presentant aubord posterieur une echancrure en 

 arc de cercle ou s'applique le bord posterieur du pygidium. 

 Aire posterieure du pronotum ponctuee . 



G. Dinoderus, Steph. 

 3-2— Front distinct, de moitie plus court que l'dpistome. 

 Deuxieme articledes antennes aussi long que le premier. 

 Dernier segment ventral apparent de l'abdomen entier, 

 arrondi au bord posterieur. Aire posterieure du pronotum 

 converte de granules ecrases . G. Rhizopertha, Steph. 



C 2 



