CLASSIFICATION OF THE RHYXCIIOPHOROUS COLEOPTERA. 461 



Beak short, broad, gular margin not promiueut, eyes round. 



SlTONIXI. 



Beak short, very thick, buccal cavity deep Batiiykini. 



Beak modei'ately long, gular margin prominent, peduncle and men- 



tum retracted Alopuixi. 



B. Antenual grooves not extending to the base of the mandibles ; 



,-1. Gular peduncle bi'oad truncate, mandibles emarginate at tip (antennae 



not geniculate, claws toothed) ; Itiiycerixi. 



B. Gular peduncle long : {Mecorhynchi). 



A careful anal^'sis of the tribes composing tlie last division 

 (Mecorliynchi) would extend this memoir to an unsuitable length 

 for my present purpose, and must be reserved for the concluding 

 part of my work on classification,* now in preparation. A few 

 remarks upon the other four tribes, which might even be regarded 

 as sublamiiies, will however not be out of place. The types are 

 well known with the exception of the second, Bathyriui, founded , 



upon a very remarkable species from Arizona and Texas, which ^-^V^ 

 resembles somewhat a Cratoparis, of the family Anthribidffi ; a 

 resemblance increased by the hind angles of the prothorax in ^ 

 being expanded and flattened, so as to be as wide as the base of 

 the elytra. The beak is not longer than the head, deeply con- 

 stricted at base beneath, then suddenly expanded so as to be as 

 broad as long, very thick, strongly channelled and deeply emar- 

 ginate above. The autennal grooves are deep, extending to 

 the base of the mandibles and flexed below the eyes., which are 

 pointed below ; the scape of the antennae extends as far as the 

 eye ; the 1st joint of the funiculus is J as long as the scape ; the 

 2d is about ^ as long as the 1st; the 3d -7th nearly equal in 

 length, gradually a little thicker ; club pubescent, oval, annulated 

 as usual. The buccal cavity is very deep, and square. The gular 

 peduncle is not visible, and the mentum small, narrow, and deep 

 in the cavity ; the mandibles are strong, their base very broad and 

 transverse, the tip (so far as I can see) feebly emarginate. The 

 prothorax is lobed behind the eyes, and the prosternum deeply, 

 almost, semicircularly, emarginate in front. The front coxae are 

 contiguous ; the side pieces of the metasternum narrow ; the sides 

 of the elytra narrowly emarginate behind the humeri, scutellum 

 transverse, wider behind ; the. sutures of the ventral segments are 

 straight, and the segments less unequal than usual, the 3d and ith 



* Classilicatiou ot tlie Coleopieni ot X. America. Smithsonian Institutiou JJiscell. 



Publications. 8vo. 



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