61 



4 (17). Median vitta entire in front, not forked. 



5 (15, 16). Lateral vittae with distinct branch exteriorly. 



6 (11). Punctures of elytral striae moderate or fine; thoracic 



vittae continuous, their outline distinct. 



7 (10). Vittae irregular in outline, not strongly elevated; punc- 



tures of elytral striae rather fine. 



8 (9). Elytral intervals feebly alternating in width and convexity, 



the narrower intervals and thoracic interspaces with a luteous 

 coating; length 11-14 mm. U. S., Cau perUnax. 



9 (8). Elytral intervals flat, equal, usually uniformly coated, 



thoracic vittae in one variety tending to obliteration; length 

 11-14 mm. U. S robiisius. 



10 (7). Vittae strongly elevated, parallel, entire; punctures of 



elytral striae moderate, the intervals alternating in width, 

 the broader strongly convex; surface with luteous coating as 

 in pertinax; length 10-11 mm. Ga., 111., Wis., Nev., Mich., 

 Kan cosiipennis. 



11 (6). Punctures of elytral striae coarse, lateral vittae more or 



less interrupted or obscure just in front of origin of branch, 

 outline of vittae confased by very coarse punctures of inter- 

 spaces. 



12 (13, 14). Hind tibiae of male strongly angulate, angle with 



dense bi;ush of long hair; elytral intervals alternating, the 

 broader and more convex biseriately punctulate, the others 

 uniseriately, striae with coarse punctures; median vitta entire; 

 length 9-12 mm. 111., Wis., Kan scoparius. 



13 (12, 14). Male tihvce normal, elytra! intervals subequal, striae, 



with very coarse foveae; interruption of lateral vittae conspic- 

 uous, the interspaces with coarse subconfluent foveae; median 

 vitta entire; length 8-9 mm. Middle, Western, and Southern 

 States, Can sculptilis. 



14 (12, 13). Male tibiae normal, elytra angulate-carinate at third 



elytral interval, especially on basal half; median vitta not 

 reaching base of thorax, a small callus near anterior angles, 

 punctures foveolate; elytral surface uneven, strijie with foveo- 

 late punctures; surface usually with uniform brownish or 

 olivaceous coating; length 8-12 mm. Middle, Western, and 

 Gulf States cariosus. 



15 (5, 16). Lateral vitt«3 vaguely indicated, branch obsolete, 

 median rei)resented by a short carina beginning at apex and 

 ending in a smooth, usually denuded, rhomboid spot near 

 middle; a small callus near anterior angles; elytral surface 

 uneven, stria) moderately coarsely punctate, surface with 

 brownish coating; length 7.5 -10 mm. Ga. to Mich., 111., and 

 Kan ))icl((H()C('j)/iahis. 



