SILPHIDJE. 45 



and hairiness of the elytra, luit their non-truncate character and the apical 

 slenderness of the hind tibia' show that it can not be referred to that genus. 

 The elytra are long and narrow, without longitudinal carinaj, with tapering 

 pointed apices, sparsely covered with rather long hairs, visible only on the 

 pale transverse bands which cross the base and middle of the apical half of 

 the elytra; these have rounded outlines, apparently just fail to reach either 

 margin, and are more than half as long as broad on each elytron; the abdo- 

 men is hairy and angulate at tip, the hind tibia? slender and equal, with 

 rather dense and coarse erect hairs and apparently without apical spurs. 

 The hind tarsi are also hairy but less prominently, the first joint long, all 

 the remainder short and equal, the last not seen in the specimen. 



Length of fragment, 6 mm.; of elytron. f> mm.; breadth of same, 1.5 

 mm.; probable full length of elytron, 6 mm; probable length of beetle, 11 

 mm.; length of hind tibia-, '2.5 mm. 



Florissant, Colorado; one specimen, No. 4700. 



AGYRTES Frohlich. 



The specie* here described is the only known extinct form of this 

 genus, which has now a very limited number of species in the north tem- 

 perate zone, and only one in the United States. 



AcYRTES PKIMOTICUS sp. noV. 



PI. V, tig. 6. 



The specimen referred here is considerably larger than our native 

 species and by no means of so slender a form, but it would seem to fall 

 here from the structure of the antennas and elytra and can not be referred 

 to any other of our genera of Silphida-. The specimen is tolerably perfect 

 on the right half of the body, but does not show any important part of the 

 leu's. The head is transversely oval, smooth, with tolerably large round 

 eyes. The antenna:' reach to the base of the elytra; the third joint, though 

 twice as long as the second, is not longer than the succeeding, though much 

 slenderer than they and equal, while the next five, though submoniliform, 

 are larger apically than basally, increase very slightly in size, and the last 

 three are scarcely larger, equal, and subquadrate, the last apically rounded. 

 Thorax nearly twice as broad as lony, much narrower in front than behind, 



