NORTH AMERICAN COLEOPTERA. 95 



elytra a little wider than the thorax, sides parallel at base, narrowed at apical 

 two-fifths, the margin feebly serrulate, the apices obtuse ; disc feebly convex, 

 basal fovea rather deep, the first costa elevated from apex nearly to middle, then 

 expanding in a smooth space ; the second costa slightly elevated near apex, then 

 expanding in a wide, smooth space, again narrowing, but becoming somewhat 

 wider near the base ; third costa indicated by an oblique, smooth line, the fourth 

 scarcely at all indicated ; the intervals between the costse and smooth spaces very 

 densely and finely punctured, except a space at and behind the humeral umbone ; 

 body beneath coarsely not closely punctate; presternum very distinctly lobed in 

 front ; ventral segments with feebly indicated, smooth, lateral spaces, the margin 

 of the last segment serrulate ; anterior femur with an acute tooth, serrulate on 

 its distal edge. Length .46 - .56 inch ; 11.5 - 14 mm. (Fig. 120. ) 



Male. — Presternum densely punctured with a smooth elevated median line, 

 sparsely pubescent ; anterior tibia (124) slightly arcuate, a slight subbilobed dila- 

 tation extending one-third from the tip ; middle tibia slightly arcuate, thickened 

 at apex, the posterior straight ; last ventral segment (122) semi-circularly emar- 

 ginate at apex, vaguely concave at middle ; last dorsal coarsely punctate, sub- 

 truncate at apex. 



Female. — Prosternum with very coarse punctures, not closely placed, median 

 smooth space distinct ; anterior tibia slightly arcuate, the middle and posterior 

 nearly straight; last ventral segment (123) with a slight triangular notch. 



The extent of the smooth spaces formed by the dilatation of the 

 costae is variable. The aspect of the species is peculiar, and totally 

 unlike any other in our fauna. 



I have seen three % specimens in the cabinet of Dr. LeConte from 

 New Mexico and one 9 in my cabinet fi-om Arizona. 



25. C exesa Lee. — Form rather broad, nearly as in femorata. but rather 

 more acute posteriorly, color dark bronze, the punctured spaces somewhat cu- 

 preous, beneath brassy; antennae cupreous, narrower to tip, third joint as long 

 as the next two ; front rather flat, coarsely, closely punctate, sparsely pubescent, 

 the occipital carina bifurcating on the vertex, two small, round callosities at the 

 middle of the front; clypeus (126) with a broadly oval emargination at middle, 

 arcuate each side ; thorax nearly twice as wide as long, narrower at base, the 

 sides suddenly narrowing at apex and obliquely at base ; disc moderately convex, 

 a vague, median depression with a smooth line posteriorly, a large callosity each 

 side of middle in front, another oblique nearer the side, two callosities on each 

 side near the base, more or less confused, the surface otherwise coarsely and sub- 

 confluently punctured ; elytra wider than the thorax, the humeri quite promi- 

 nent, sides subparallel, obliquely narrowed at apical third, the margin serrate, 

 the apices obtuse ; disc moderately convex, the first costa elevated from apex to 

 near the base expanding in a broad space, the other costse interrupted and broadly 

 expanded in smooth spaces, the fourth finely elevated, the basal fovea moder- 

 ately deep, two discal densely punctured foveje, the first one-third from apex, 

 transverse, extending from the first to the fourth costa, a second in front of mid- 

 dle, larger, extending from the first to the third costa; the smoother spaces 

 formed by the dilated and confluent second and third costse are placed posteriorly 

 to these fovese and between them and with a larger smooth space near the base 

 extending from the first to the third costa ; the surface otherwise than men- 



