1891.] [Horn. 



The thorax is wider than long, the median line impressed. 



The male has simple anterior tarsi. The last ventral is broadly trian- 

 gularly emarginate and impressed along the middle. 



This species is notable in having the claws cleft very near the tip, so 

 that the under portion is but little shorter than the upper. 



Occurs in Colorado and New Mexico. Collected by Prof. F. H. Snow. 



C. elegans, Lee,. Ann. Lye., v, p. 161; Proc. Acad., 1853, p. 341 ; var. 

 humerdlis Horn, Trans. Am. Ent. Soc., 1870, p. 93. 



Antennae filiform, moderately closely articulated, joints all longer than 

 wide. On each side of the front, at the insertion of the antennae, is a gib- 

 bosity causing a deep depression above the clypeus. 



When fully colored, the dull blue elytra have a yellow vitta of irreg- 

 ular form starting from the humeri, continuing closer to the side than the 

 suture and with an interruption near the apex. The vitta may be 

 reduced in size until there remains merely a triangular humeral spot. 



The males have the anterior tarsi dilated, not very notably except the 

 first joint ; there is, however, no depression above. The last ventral 

 segment is feebly triangularly emarginate. 



Occurs in various parts of Southern California, from San Diego north- 

 ward. 



C. perpulchra Horn, Trans. Am. Ent. Soc., 1870, p. 92. * 



Very like elegans in all its structural characters. The bright blue elytra 

 have three yellow bands, basal, median, and apical, interrupted by the 

 suture. This species may vary by the gradual loss of the bands, from the 

 apical to the basal, until the elytra are entirely bfue. Those with the 

 humeral spot only resemble the var. Jiumeralis, of the preceding species ; 

 but apart from the ornamentation, the two species may be distinguished 

 by the present having a brighter blue color, smoother surface, the head 

 and thorax quite smooth, while in elegans they are very obviously punc- 

 tate. 



The sexual characters are as in elegans. 

 Occurs in Owen's Valley, Cal. 



C. Fuller! Horn, Trans. Am. Ent. Soc., 1878, p. 59. 



Black, subopaque. Antennae filiform, but rather stout ; joints closely 

 articulated and scarcely longer than wide. Head, from in front, triangular 

 in form, the sides parallel behind the eyes, hind angles obtuse, occiput 

 truncate. Thorax nearly twice as wide as long. 



The anterior tarsi of the male are simple ; the last ventral broadly tri- 

 angularly emarginate, the fifth broadly and not deeply emarginate. 



Occurs in Southern California. Found rather abundantly by Mr. Mor- 

 rison. 



C. moesta Horn, Trans. Am. Ent. Soc., 1878, p. 59. 



Entirely black. Thorax longer than wide, not closely punctate. 

 Antennas slightly thicker externally, the joints submoniliform and not 



