64 
± (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). Vittse 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., Can. pevivncix. 
9 (8). Elytral intervals flat, equal, usually uniformly coated, 
thoracic vittae in one variety tending to obliteration; length 
11-14 mm. U. S. robustus. 
10 (7). V ittae strongly elevated, parallel, entire; punctures of 
elytral striae moderate, the intervals alternating in width, 
the broader strongly convex; surface with luteous coating as 
m pertinax; length 10-11 mm. Ga., Ill., Wis., Nev., Mich., 
-^- an . costipennis. 
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 confused by very coarse punctures of inter¬ 
spaces. 
12 (13, 14). Hind tibiae of male strongly angulate, angle with 
dense brush 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. Ill., Wis., Kan. scoparius . 
13 (12, 14). Male tibiae normal, elytral intervals subequal, striae, 
with very coarse foveaej 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, striae 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 vittae vaguely indicated, branch obsolete, 
median represented 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, striae moderately coarsely punctate, surface with 
brownish coating; length 7.5-10 mm. Ga. to Mich., Ill., and 
. melanocephalus. 
