264 COLEOPTERA OF NORTH AMERICA. 



though in some of the species of the second group very slightly 

 so ; the neck is not very slender ; the hind coxae are nearly con- 

 tiguous, the intercoxal process being very small and acute. 

 The genera indicate three groups : — 



Claws cleft to the base. Nematopli. 



Claws slightly dilated at the base. Eurygenii. 



Claws with a broad basal tooth. Pedili. 



Group I. — Nematopli. 



Nematoplus collaris Lee, a. slender black insect with a reddish- 

 yellow thorax, alone constitutes this group ; the mandibles are 

 acutely emarginate at tip ; the epistoma is not separate from the 

 front ; the maxillary palpi are but feebly dilated ; the middle coxae 

 are distinctly separated ; the abdomen of the male has six ventral 

 segments, the fifth being emarginate ; the tarsi are entirely fili- 

 form, and the claws are cleft to the base, as in Stenotrachelus. 



The insect is very rare, and is found in the Northwestern States. 



Group II. — Eurygenii. 

 Elongate insects clothed with gray pubescence ; the mandibles 

 are broadly truncate at .tip ; the epistoma is not separate from the 

 front ; the maxillary palpi are considerably dilated ; the middle 

 coxae are very slightly separated ; the abdomen in both sexes has 

 but five ventral segments ; the anterior tarsi are somewhat di- 

 lated, and the penultimate joint of all is bilobed ; the claws are 

 very slightly dilated at base. 



Last joint of maxillary palpi broad, securiform. Eurygenius. 



Last joint of maxillary palpi long, cultriform. Stereopalpus. 



The three species of the first genus differ in the form of the 

 eyes ; in E. Wildii Lee. they are deeply emarginate, in the Cali- 

 fornian E. constrictus Lee. slightly, and in E. murinus scarcely 

 at all emarginate. Those of the second genus have the eyes very 

 slightly emarginate ; in both the eyes are less finely granulated 

 than in the first and third groups. 



Group III.— Pedili. 

 This group consists of but a single genus, Pedilus, represented 

 by several species in the Atlantic, and one in the Pacific district. 

 They are prettily colored insects, with the thorax globose, polished, 

 and usually yellow ; in the males the tips of the elytra are con- 

 vex and polished, resembling somewhat a vesicle. 



