NORTH AMERICAN COLEOPTERA. 101 



Male. — Prosternura deusely punctate, sparsely pubescent ; anterior tibia (158) 

 slightly arcuate, with a small semi-circular dilatation before the apex ; middle 

 and posterior tibise straight; last ventral segment (1.57) broadly arcuately trun- 

 cate ; last dorsal sparsely punctate, entire. 



Of this species I have seeu but three males. It resembles very 

 closely and might readily be mistaken for deleta, which has, however, 

 the first costa at least elevated neai- the apex. In deserta the clypeus 

 is rather more broadly emarginate and the anterior tibia of the male 

 otherwise formed. 



Occurs in the Mojave Desert of California, also near San Diego. 



32. C lixa n. sp. — Form subcylindrical, moderately convex, dark bronze, 

 moderately shining, sparsely pubescent ; antennte dark bronze, gradually more 

 slender to the tip, the third joint but little longer than the second or fourth; 

 front convex, coarsely and moderately closely punctured in both sexes and 

 slightly pubescent; clypeus (160) broadly triangularly emarginate at middle, 

 rounded on each side ; twice as wide as long, base and apex equal, the sides regu- 

 larly arcuate ; disc convex, coarsely, deeply and rather closely punctate, more 

 densely at the sides, often with a median smooth space posteriorly, but without 

 distinct callosities ; elytra scarcely wider than the thorax, parallel, narrowed at 

 apical third, the margins finely serrulate, the apices obtuse ; disc convex, the first 

 costa distinctly elevated from the apex to middle or even more, and continued 

 by a smooth line, the second and third indicated by smooth lines, basal fovea dis- 

 tinct, a faint, more densely punctured fovea one-third from apes external to the' 

 second co.sta, another in front of middle interrupting the second costa, surface 

 otherwise relatively coarsely and rather closely punctate ; body beneath more 

 shining than above, the punctuation less coarse and moderately close along the 

 side of the body and ventral segments, these with a feeble lateral umbone, the 

 last segment with serrulate margin ; anterior femur with a small, rather acute 

 tooth, serrulate on its outer edge ; jn'osternum scarcely lobed in front. Length 

 .16 - .28 inch ; 4-7 mm. (Fig. 1.59.) 



Male. — Prosternum coarsely and moderately closely punctured, scarcely punc- 

 tured near the anterior margin: anterior tibia (163) .slightly arcuate and grad- 

 ually thicker to tip and with a very faint dilatation at apex ; middle tibia very 

 slightly arcuate, the posterior straight; last ventral segment (161) nearly semi- 

 circularly emarginate, last dorsal coarsely sparsely punctate, slightly emarginate 

 at apex. 



Female. — Prosternum more coarsely and si)arsely punctate, a median smooth 

 space posteriorly; tibiae nearly straight; last ventral (162) longer than in the 

 male, the apex truncate, with distinct but not prominent angles; last dorsal 

 coarsely, sparsely punctate, apex entire. 



This species might be mistaken for a small form of deleta. It is, 

 however, more cylindrical, the punctuation relatively coarser, and 

 the thorax without callosities. The male sexual characters are not 

 different, but the last ventral of the females is distinctly so. 



Occurs in Texas and Arizona, taken rather abundantly by Morri- 

 son in the latter reg-ion. 



