March, 1845.] 215 



feet dull pale rufous, short, with the tarsi simple; posterior femoral plates ab- 

 ruptly dilated and rounded within. 



CoiirwiiiTES, Latr. 



1. C. atropurpurcus. Black-purple, glossy; feet, epipleurce, lateral edges 

 and tip of the venter, rufous. — 5 I. long, If 1. wide. Pennsylvauia. 



Black-purple, shining, slightly metallic: head profoundly and not densely 

 punctured, with the front triangularly flattened ; clypeus at tip immarginate, 

 slightly declined; labrum dusky rufous: antennae not as long as the thorax, 

 scarcely serrate, blackish, with two basal joints rufous; second joint small, ob- 

 conic, third slightly shorter and less robust than the fourth, eleventh joint with 

 a minute accessorial one : thorax convex, not longer than wide, wider at base 

 than at apex, with the sides rounded from base to apex ; punctured like the 

 head, and like it sparsely pubescent ; medial line entire, somewhat obsolete be- 

 fore the middle ; posterior angles acute, feebly excurved, and like the anterior 

 edge, obsoletely rufous or piceous : scutel ample, clothed with ashy hairs: 

 elytra hardly widest in the middle, finely punctate-striate, the interstices flat, 

 broad, much and finely punctured ; lateral edge obsoletely rufous : beneath 

 black-brown : feet, epipleuras, lateral abdominal margins and tip, rufous. 



2. C. hirticollis. Black-fuscous, densely pubescent ; clypeus strongly im- 

 pressed in the middle at tip ; feet rufous. — 6 1. long, 2 1. wide. Pennsyl- 

 vania. 



Black-fuscous, densely clothed with an ochreous pubescence : head coarsely 

 punctured, with the clypeus immarginate, slightly declined before, strongly im- 

 pressed in the middle at apex ; eyes black, shining ; antennae not much longer 

 than the thorax, fuscous, serrate from the fourth joint, second joint some 

 shorter than the third, which is hardly as long as the fourth, and not as broad, 

 terminal joint subulate : thorax nearly as wide as long, convex, with the sides 

 feebly rounded ; closely and deeply punctured ; dorsal groove only obvious be- 

 hind ; pile placed in whirls ; posterior angles straight, subacute, finely carinate; 

 scutel punctured pilose : elytra punctate-striate, the interstices flat, minutely 

 punctured; densely pilose at base; sides rectilinear from base to behind the 

 middle, thence to the apex gradually arcuated; tip acutely rounded; lateral 

 edges and epipleurae, dusky rufous : feet and lateral margins of terminal ventral 

 segment, rufous ; tarsi simple, with the joints gradually decreasing in length ; 

 posterior femoral plates lanceolate. 



3. C. interstitialis . Black; interstices of the elytra broad, flat, punctulate; 

 clypeus emarginate ; feet and antennae rufous. — 7£ 1. long, 2§ 1. wide. Penn- 

 sylvania. 



Black, with a dark purple reflection, ochreous pubescent : head flattish, 

 densely ochreous pubescent, with the clypeus as in the preceding species ; an- 

 tennae longer than the thorax, subserrate from the fourth joint; rufous; joints 

 as in the preceding species : thorax not much longer than wide, slightly con- 

 tracted at base, with the sides almost rectilinear ; densely and deeply punc- 

 tured ; dorsal groove only apparent towards the base ; posterior angles not ex- 

 curved, acute, strongly carinate, with the carinae slightly oblique : scutel finely 

 26 



