OF PHILADELPHIA. 95 



at the posterior margin ; basal angles rectangular, acute ; base 

 niucli narrower than the elytra : elytra with punctured stri^, 

 punctures small ; interstitial lines slightly convex; beneath dark 

 piceous or blackish. 



The form of the body and the curvature of the thorax are very 

 similar to those of F. unicolor Say, nevertheless it is a much 

 smaller insect, the thoracic base is depressed and the posterior 

 angles are acute, and the striae of the elytra are more deeply im- 

 pressed than in that insect. It was found on the Arkansa river 

 near the Rocky Mountains. It belongs to the genus Pterostichus 

 ofBonelli. 



[Belongs to Evarthrus. — Leg.] 



ZABRUS Clairv. 



Z. AVIDUS. — Black ; feet rufous; base of the thorax and striae 

 of the elytra punctured. 



Length seven-twentieths of an inch. 



Body deep black : labrum deep piceous : antenuge and palpi 

 rufous : thorax short and wide, with a few punctures before, and 

 numerous ones on the posterior depressed margin ; dorsal line very 

 distinct ; elytra punctured ; interstitial lines depressed, a little 

 convex ; beneath black : venter deep piceous at tip : feet rufous. 



[An Amara of the division Liocnemis, afterwards described as 

 A. confinis Dej. — Lec] ri49l 



CALOSOMA Linn. Latr. 



L C. OBSOLETA.— Brownish-black; elytra reticulated and with 

 three series of impressed bluish spots. 



Inhabits Arkansa. 



Body brownish black : mandibles rugose and convex on the 

 superior surface : thorax obtusely and minutely rugose, impunc- 

 tured ; region of the posterior angles indented ; an abbreviated 

 impressed dorsal line ; posterior angles rounded, extended back- 

 ward a little beyond the basal line : elytra reticulate ; longitudi- 

 nal lines slightly impressed, not more dilated than the transverse 

 ones, which are mostly continuous, their points of intersection 

 marked by a puncture; three series of impressed bluish or viola- 

 ceous obscure spots on each elytron ; lateral margin in a certain 

 light very obscurely purplish. 

 1823.] 



