H. C. FALL. 123 



This species doubtless passes in collections for dimidiatus, 

 in which, however, the hind tibiae of the male are gradually 

 widened from the base, the inner margin straight. 



C, longus n. sp. 



Elongate, parallel, convex, feebly shining, brown, the head and pro- 

 pygidium somewhat darker, the elytra, legs and antennas a little paler ; 

 pubescence of upper surface short and rather inconspicuous ; sides of 

 prothorax and elytra fimbriate with short close-set hairs. Head and 

 prothorax densely punctate, elytra a little more finely and less densely 

 so, the dorsal segments of the abdomen still less closely punctate though 

 not sparsely so. Head fully § as wide as the prothorax. Prothorax % 

 as long as wide, very little narrowed in front, sides nearly straight, 

 hind angles rounded. Elytra with sutural length slightly shorter, and 

 lateral length a little longer than their width ; \ longer along the 

 suture than the prothorax. Body beneath densely punctate anteriorly; 

 abdomen somewhat less so. Additional anal segment of male inferior 

 in position. Legs short and stout, differing very little in the sexes. 

 Length, 4.4 mm. ; width, 1.7 mm. 



Santa Rita Mountains, Arizona. A single pair kindly 

 given me by Mr. Schwarz. 



In Horn's table this species would fall near mutilatus, but 

 the large size, narrow, parallel, rather convex form give it 

 an appearance which is quite different from any of our other 

 species. The ciliae of the lateral margins of the prothorax 

 and elytra are longer than in any other of our species, 

 except possibly longiventris. 



C. longiventris Sharp. 



Specimens which agree sufficiently well with Sharp's short 

 description of this Mexican species have been taken in the 

 Santa Rita Mountains of Arizona by Hubbard and Schwarz, 

 and more recently by Prof. Snow. It is a stout convex 

 species of the general type of pallipennis, but longer, fusc- 

 ous, the antennae, legs and vertex rufous, the elytra rufous 

 with the suture narrowly at base, and a broad median stripe 

 or cloud fuscous. Punctuation nearly as in pat 'Upturn's; sup- 

 plementary anal segment of male vertical, produced, nar- 

 rowed to apex, the tip rounded and polished ; last ventral 

 with an apical fovea, on each side of which is a transverse 

 polished tuberculiform elevation. Tibiae all stouter in the 



TRANS. AM. ENT. SOC, XXXVI. JUNE, 1910. 



