NORTH AMKKICxVN COLEOPTEKA. 267 



not SO densely, that the intervals between them are entirely obliter- 

 ated. These are the typical foi-nis as described by Knocli. 



One peculiarity of the elytral sculpture is best marked in the 

 southern forms, the denser group of punctuation on each side of the 

 suture beginning about one-fourth from the scutellum, extending 

 from that point nearly half way to the apex. 



When the pubescence is entirely removed from a specimen, as may 

 occur, it is difficult to distinguish an Illinois specimen from the group 

 of species allied to cognata. 



Occurs abundantly in the entire Atlantic region extending to 

 Nebraska and Texas. 



53- li. delata. n. sp. — Oblong, slightly broader behind, piceous brown, head 

 and thorax more shining, surface sparsely clothed with short, semi-erect, grayish 

 hair. Clypeus moderately deeply, broadly emarginate, border very narrowly 

 reflexed, surface densely coarsely punctate, front less densely, front and clypeus 

 with short erect hair. Thorax uarrowed from the base, the sides more oblique 

 in front, margin subcrenate and ciliate, surface with coarse deep punctures not 

 closely placed, a little closer near the side, each puncture with a short semi erect 

 hair, a distinct chanuel along the basal margin from the hind angles nearly to 

 middle. Elytra rather finely and rather closely punctate, forming a somewhat 

 denser space behind the scutellum, the punctures near the base slightly rugose, 

 nearer the apex stellate, discal costfe very indistinct, the surface subopaque. 

 sparsely clothed with short, fine, semi-erect pubescence. Pygidium sjmrsely. 

 irregularly punctate. Metasteruum densely punctured, the hairs yellowish, not 

 long nor dense. Abdomen sparsely finely punctate at the sides, each puncture 

 with a short hair, last two segments more coarsely punctured. Claws curved, 

 with a strong median tooth. Last joint of maxillary palpi fusiform, not im- 

 pressed. Length .65 inch ; 16.5 mm. 



Male. — Antennal club a little longer than the funiculus. Ab- 

 domen slightly flattened at middle, penultimate segment (fig. 33) 

 with an impression at middle which becomes rapidly wider and ex- 

 tends along the posterior border of the segment, on each side of the 

 impression the segment is more convex, and with an oblicpie plica 

 more external, last segment slightly concave, acutely notched at apex, 

 a distinct longitudinal impression. Inner spur of hind tibia half the 

 length of the outer, the latter long and slender. 



Of this species I have seen but two males, not differing. 



This species resembles hirsuta, but is more 'oval, less hairy, the 

 clypeus more widely emarginate and more densely punctured. It 

 has also 10-jointed anteniue, while in hirsida they are but nine. 



Occurs in eastern Kentucky. 



