410 COLEOPTERA OF NORTH AMERICA. 



Tribe I.— PEDILINI. 



The species of this tribe are of much larger size than those of 

 the other tribes, varying in size from one-fourlh to one-half au 

 inch in length ; they are found on flowers. 



The head is constricted far behind the eyes, which are tolerably 

 finely granulated, never regularly oval, and always emarginate, 

 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. Eukygekii. 



Claws with a broad basal tooth. Pedili. 



Group I. — Nematopli. 



Nemafoplus 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 coxie 

 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 

 cox£e are very slightly separated ; the abdomen in both sexes 

 has but five ventral segments; the anterior tarsi are somewhat 

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

 very slightly dilated at base. 



Terminal joipt of antennae not elongated ; 



Last joint of maxillary palpi broad, securiform. Eurygenius, 



Last joint of maxillary palpi long, cultriform. Stereopalpus. 



Terminal joint of antennae much longer ; 



Last joint of maxillary palpi elongate, subtriangular. Bactrocerus. 



The three species of the first genus difi'er in the form of the 

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



