LeConte.] 



ERIRHININI. 183 



Our genera may be tabulated as follows : 



Club of autennaj entirely sensitive 2. 



" " partly smooth and shining ; pros- 



ternuni not excavated LISSORHOPTRUS. 



2. Prothorax feebly constricted in front BAGOUS. 



" very strongly constricted in front. ... PNIGODES. 



LISSORHOPTRUS n. g. 



This is the genus indicated without characters, and not named by Lacor- 

 daire.* It is founded upon Bagous simplex Say. It difters remarkably 

 from the other genera of the group by the antennae, the club of which is 

 smooth and shining for two-thirds the length, and annulatedonly near the 

 tip ; the funiculus has but six joints, of which the first is stout, and the 

 second a little longer than the others, which increase slightly in thickness. 

 The prosternum is flattened, not excavated, transversely impressed in front 

 of the coxae, which are very large ; tibiae not very slender, somewhat 

 curved, armed with a terminal hook. Tarsi narrow, last joint as long as 

 the two preceding, claws slender, approximate. Beak stout, as long as the 

 prothorax. Antennal grooves suddenly deflexed. 



This is again a genus of transition, and only differs from Onyehylis by 

 the third joint of tarsi not emarginate, by the peculiar antennal club, by 

 the tibiaj armed with sti'onger terminal hook, and the articular surface 

 even of the hind pair lateral. 



1. L. simplex. Bagou's simplex Say, Cure. 29 ; ed. Lee. i, 297 ; Bagous 

 egenus Gyll., Sch. Cure, iii, 549 ; Notiodes eg. ibid, vii, 2, 184. 



Middle and Southern States to Texas. Say's description is far from 

 sufficient. 



2. L. apiculatus. Notiodes apieulatus Gyll., Sch. Cure, iii, 320. 

 Southern States and Texas. Only differs from the preceding by the 



usually larger size, and by the transverse impression at the middle of the 

 sides of the prothorax being wanting. 



BAGOUS Germ. 



The essential characters of this genus consist, in my opinion, in the tibisu 

 being slender, strongly curved and armed at the tip with a strong hook, so 

 that the articular surfaces become lateral; the tarsi are narrow, not spongy 

 beneath, though the third joint is sometimes wider and emarginate. The 

 claws are divergent, sometimes rather large. The club of the antennae is 

 entirely pubescent, sensitive, and larger than usual ; the antennal grooves 

 are deep and extend to the eyes ; the beak varies in form. The proster- 

 num is broadly and deeply excavated in front of the coxae, and the groove 

 is sharply limited at the sides by ridges ; the postocular lobes are large. 



* Gen. Ool. vi, 489, note 2. 



