AMERICAN PHILOSOPHICAL SOCIETY. 471 



marginal groove dilated, piceous, resembling a narrow depressed 

 margin and reflected edge, dorsal line distinct, lateral edge not 

 excurved near the hind angles, base wider than the petiole, pos- 

 terior angles prominent and rounded ; elytra, striae punctured, in- 

 terstitial lines convex, third one with a puncture behind the 

 middle, and one near the tip; feet piceous; postpectus punctured 

 each side behind the intermediate feet and at base; venter im- 

 punctured. 



This species very much resembles decentis, but the thorax is 

 more dilated, and the elytra narrower. It may be distinguished 

 by having the postpectus punctured both at base and each side. 



[Afterwards described by Germaras Poecllus monedula. — Lec] 



18. F.IMPDNCTATA. — Black, glabrous, impunctured; antennae 

 and palpi pale rufous ; fest testaceous. 



Length a little more than two-fifths of an inch. 



Body black, impunctured, glabrous; [45] antennaj slender, 

 extending beyond the humerus, and with the palpi pale rufous ; 

 thorax broadest rather before the middle, contracted behind, 

 margin a little depressed behind, the edge somewhat recurved, 

 posterior angles obtusely rounded, base impunctured; elytra pro- 

 foundly striated, strise impunctured, interstitial lines convex, the 

 third one with two distant punctures ; feet testaceous. 



Resembles suhmargiaatus and decentis, but is entirely destitute 

 of punctures ; the form of the thorax also is perfectly distinct. 

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



[Belongs to Pristodactyla ; described by Dejean as P. ameri- 

 cana. — Lec] 



19. F. VENTRALis. — Black, glabrous, all beneath piceous- 

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

 pectus. 



Length rather more than two-fifths of an inch. 

 Body above black, polished, beneath piceous-black ; 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 pedicel, lateral margin not depressed, edge not excurved 

 behind, dorsal line slightly impressed, basal lines distinct, con- 

 1823.] 



