442 COLEOPTERA OF NORTH AMERICA^ 



Group I. — Ophryastes. 



Rostrum robust, ang-ular, more or less distinctly trisuleate, tip 

 feebly emarginate with a small triangular smooth space. Antennae 

 moderately robust, scaly, scape gradually thicker, nearly attaining 

 the eyes, funicle 7-jointed, the last joint contiguous to the club 

 which is oval. Scrobes deep, passing obliquely downwards in 

 front of the eyes. Eyes oval, transverse, pointed beneath. Thorax 

 variable in furm, either oval or transverse, and with callosities at 

 the sides. Elytra oval or oblong. Scutellum wanting. Abdo- 

 minal sutures straight, second segment equal to, or very little 

 longer than the third. Tibiae not mucrouate at tip. Tarsi vari- 

 able. Claws free. 



The articular surfaces at the tips of the hind tibijB are very 

 nearly terminal and in great part scaly. Lacordaire calls them 

 " caverneuses," but without reason (for the majority of our spe- 

 cies). They are cavernous in some Eupagoderes. The meso- 

 sternal side pieces are very unequal, the epimeron being very 

 small. The nietathoracic epistcrnum is moderately broad and the 

 suture more or less distinct. In all the species the ocular lobes 

 are of moderate size and fimbriate. The surface of the body is 

 densely scaly and without any pubescence. 



Two genera appear to be indicated in our fauna: — 



Tarsi slender, third joint not wider tlian second, and simply emarginate ; 

 sides of thorax with tuberosities more or less marked ; tips of tarsal 

 joints beneath spiniform. Ophryastes. 



Tarsi dilated, third joint usually wider than the second and deeply bilobed ; 

 thorax oval without tuberosities, tarsi beneath not spinous at tip. 



Eupagoderes. 



In the first genus the elytra are broadly oval, in the second 

 elongate oval. In the latter also, the legs are longer. 



The species occur from Kansas to eastern California, and 

 Lower California. 



Groiip II. — Rhigopses. 



Rostrum quadrangular, broader in front, deeply sulcate above. 

 Eyes narrow, acute beneath. Tarsi not dilated, beneath spinu- 

 lose, third joint emarginate, but not broader than the second. 

 Corbels of hind tibiae feebly cavernous. Posterior coxae very 

 widely distant. Intercoxal process broad, truncate, second abdo- 



