THE CANADIAN ENTOMOLOGIST. 157 



Claws cleft ; grooved line on the temples straight and extending 

 from the eyes to the occiput ; maxillary palpi 6 jointed, labials 

 stout, 4-jointed ; first ventral segment with a tooth beneath 



(Australia) Rhagigaster, Guerin. 



(^Type R. unicolor, Guer., ^ . 

 = Diamma ephippiger, Gue'r., ? .) 



2. Claws cleft ^. 



Claws simple 4. 



3. Head subquadrate, not or scarcely longer than wide ; eyes very large ; 



ocelli present ; mandibles 3- or 4-dentate ; maxillary palpi 6-jointed, 



labials 4-jointed (Australia) Diamma, Westwood, 1835. 



=:Trachypterus, Guer., 1839. 

 (Type D. bicolor, VVestw.) 



Head oblong, more than twice longer than wide ; eyes minute ; ocelli 

 wanting ; mandibles at apex bidentate ; maxillary and labial palpi 



both 4-jointed (Australia) Eirone, Westwood. 



(Type E. dispar, Westw.) 



4. Head large, oblong, longer than wide ; eyes minute ; maxillary and 



labial palpi both 4.jointed (South America) Aelurus, Klug. 



(Type A. nasutus, Klug.) 



Head large, subquadrate, a little wider than long, and much wider than 

 the thorax ; prothorax ovate ; mandibles (?) simple ; maxillary palpi 



6-jointed (Australia) Ariphron, Erichson. 



(Type A. bicolor, Erich.) 



5. Mandibles tridentate 6. 



Mandibles bidentate 9. 



6 First transverse cubitus without an appendage, the first cubital cell 



undivided .... 7. 



First transverse cubitus with an appendage or spurious nervure, which 

 divides the first cubital cell into two more or less distinct cells .... 8. 



7. Second cubital cell receiving both recurrent nervures ; maxillary palpi 



6-jointed, labials 4-jointed Diamma, Westwood. 



Second cubital cell receiving only one recurrent nervure — the first, the 

 second recurrent nervure being interstitial, or nearly, with the second 



transverse cubitus (Australia) Oncorhinus, Shuckard. 



(Type O. xanthospilus, Shuck.) 



