BY ARTHUR M. LEA. 401 



scute] lum is invariably present, and is often of comparatively 

 large size. The metasternum is usually almost as long as the 

 following segment, sometimes it is even longer; its episterna are 

 always very distinct. The abdominal sutures are always distinct; 

 that between first and second is frequently curved in the middle, 

 but the two segments are never closely soldered together; the 

 second-fourth are often drawn slightly backwards at the sides, 

 and the second is sometimes not at all or but slightly longer 

 than the third or fourth. In Aonychus the claw-joint is absent, 

 but in very few of the other genera are the tarsi at all remarkable. 

 All are winged. 



The following table is arranged solely for convenience of 

 identification, 



A. Tarsi triarticulate Aonychus, 



AA. Tarsi quadriarticulate. 



B. Body greatly depressed Imalithus. 



BB. Body more or less strongly convex. 



C. Rostrum barbed in the male Glochixorrhinus. 



CC. Rostrum barbed in neither sex. 

 D. Prosternum with supplementary processes.... Mecistocerus. 

 DD. Prosternum without supplementary pro- 

 cesses. 



E. All the femora bidentate Sybulus. 



EE. Anterior femora only bidentate Critomerus. 



EEE. Femora unidentate or edentate. 

 F. Middle coxas exposed internally. 



a. Ocular lobes distinct Berosiris. 



aa. Ocular lobes absent Microberosiris. 



FF. Middle coxae not exposed internally. 

 G. Mesosternal receptacle open. 

 h. Scape shorter than funicle. 

 c. Suture between first and second abdo- 

 minal segments distinct Neomystocis. , ' 



CC. This suture more or less obliterated in 



middle.. Nechyrus. 



hb. Scape the length of or longer than /^q -. 



funicle. [^ L « ^ P" 



d. Elytra at base not much wider than y^ 



prothorax Enteles. 







