DORYSTHEXES. O 



Synopsis of Genera. 



A. Mandibles long, curving downwards and 



backwards, narrowing towards apex. 



a. Antennae subimbricate ; lobes of third 



tarsal joint narrowed, usually spined at 

 apex. 



a'. Marginal teeth of prothorax short ; 

 prosternum witli strong anterior pro- 

 cess in cJ . 



a 2 . Only one distinct marginal tooth to 

 prothorax; prosternal process of c? 



simple DORYSTHKNES. p. 5. 



b~. Three distinct marginal teeth to pro- 

 thorax ; prosternal process of $ 



bifid DISSOSTERNUS p. 7. 



b'. Marginal teeth of prothorax long and 

 sharp ; prosternum without anterior 

 process BALADEVA, p 8 



b. Antennae serrate but not imbricate ; lobes 



of third tarsal joint rounded at apex, 

 a'. Pronotum strongly convex ; nm-ginal 



teeth rather short LOPHOSTERNUS, p. 9. 



b'. Pronotum feebly convex ; marginal 



teeth long and spiniform PARAPHRUS, p. 13. 



B. Mandibles vertical or oblique, not recurved. 



a. Mandibles of moderate length and never 



falciform; third tarsal joint incompletely 



bilobed or simply emarginate. 



a'. Marginal teeth of prothorax short ; 



tibiae not carinate ; antennas of <3 



usually either imbricate, pectinate or 



flabellate PRIONUS, p. 14. 



V . Marginal teeth of prothorax long and 



spiniform ; tibiae carinate and sulcate ; 



antennae serrate or subserrate 



a 2 . Epipleures of elytra gradually and 



only slightly widened towards base. 



a 3 . Antennal supports depressed : pro- 



notum not tuberculate PRIONOMM.*, p. 16. 



b 3 . Antennal supports raised; pro- 



notum bituberculate ANCYLOPHOTUS, p. 18. 



5 2 . Epipleures cf elytra strongly widened 



out below shoulders LOGJEUS, p. 19. 



b. Mandibles long, very long and falciform in 



fully developed males; third tarsal joint 



completely bilobed PRIOTYRANNUS, p. 21. 



Genus DORYSTHENES. 



Dorysthenes, Vigors, Zoof. Journ. ii, p. 514 (1826) ; Lacord. Gen. 



Cottopt. viii, i>. 53 (1869). 

 Cj-rtognathus, Casteln. Hist. Nat. An. Art. ii, p. 389 (1840). 



Type, D. restrains, Fab. 

 Range. India, Burma and Siam. 



3 . Mandibles long, curved backwards below, gradually narrowed 

 and only slightlv incurved towards the tip. Antenniferous tubers 



