46 DESCRIPTION OF INSECTS 



Jintennce slender, extending beyond the humerus, and with 

 the palpi pale rufous. 



Thorax broadest rather before the middle, contracted be- 

 hind, margin a little depressed behind, the edge somewhat 

 recurved, posterior angles obtusely rounded, base im- 

 punctured. 



Elytra profoundly striated, strife impunctured, interstitial 

 lines convex, the third one with two distant punctures. 



Feet testaceous. 



Resembles suhmarginatus and decentis^ but is entirely des- 

 titute of punctures ; the form of the thorax also is perfectly 

 distinct. I caught it on Mr. R. Haines's farm in Germantown. 



19. F. ^veyitralis black, glabrous, all beneath piceous-black ; 

 thorax at base not wider than the pedicel of the post- 

 pectus. 



Letigth rather more than two-fifths of an inch. 



Body above black, polished, beneath piceous.l)lack. 



Antennae piceous, with ferruginous hairs towards the tip ; 

 labrum deep piceous ; palpi piceous. 



Thorax before the middle as broad as the elytra, gradually 

 much contracted behind, base hardly wider than the pe- 

 dicel, lateral margin not depressed, edge not excurved be- 

 hind, dorsal line slightly impressed, basal lines distinct, 

 conspicuously punctured. 



Elytra narrowed behind, strife punctured, interstitial lines 

 hardly convex. 



Pectus impunctured ; feet rufo-testaceous ; postpectiis and 

 venter punctured. 



Very like suhmarginatus ; but the form of tlie thorax is 

 very different. It was taken in Missouri by Mr. Nuttall. 



30. F. *adoxa apterous, black, glabrous, impunctured j strife 



impunctured ; basal thoracic hnes not dih^ted. 

 Length ijalf an inch. 



