8 CALIFORNIA ACADEMY OF SCIENCES. 



This sj)ecies may be distinguislied by its black color, 

 dark legs and coarse pubescence of the head, but especially 

 by the shape of the prothorax, in which the anterior angles 

 are not distinctly rounded. 



4— C. mobile ^- sp. — Eather slender, black tliroiigliout, apices of the elytra 

 just visibly paler, fuscous; legs dark brown, castaneous, tarsi testaceous; an- 

 tennas piceous, fuscous toward tip; pubescence of the elytra and abdomen 

 veiy fiine, short and extremely dense, sericeous, fulvous, that of the head and 

 pronotum excessively fine, rather sparse, dark piceo-cinereous and scarcely 

 visible. Head moderate; sides parallel and feebly arcuate; base truncate, 

 angles rather broadly rounded; surface moderately convex, rather coarsely 

 and denselj^ punctate, more finely so behind, with a narrow median impunc- 

 tate line; punctures round, feeble; between the antennas there are two rather 

 large setigerous punctures; Inbrum with four small, robust, triangular teeth; 

 autennjB distinctlj^ shorter than the head and prothorax together, very feebly 

 incra-^sate, rather slender; basal joint as long as the next two together, sec- 

 ond scarcely two-thirds as long as the third and equal in length to the fourth, 

 tenth slightly longer than wide. Prothorax nearlj^ quadrate; sides parallel 

 and distinctlj^ arcuate; base and apex evenly, rather strongly, and nearly 

 equalh" arcuate, the latter with a small feeble median sinuation; apical angles 

 rather broadly rounded, basal very broadly so; disk transversely and rather 

 feeblj^ convex, very slightly wider than the head, evenly finely and extremely 

 densely punctate; x^unctures very feebly impressed, almost contiguous; me- 

 dian line almost obsolete. Elytra at base just perceptibly wider than the 

 pronotum; sides very feebly divergent and feebly arcuate; together broadly, 

 evenly and rather strongly sinuate at apex; disk transversely and moderately 

 convex, one-fourth longer than M'ide, nearly one-half longer than the prono- 

 tum, feebly impressed on either side of the slightly elevated suture, rather 

 finely and very densely punctate; punctures slightly asperate and much finer 

 near the apex. Abdomen nearly as wide as the elytra; sides of the fifth seg- 

 ment feebl}'' convergent toward tip; surface transversely strigate in close 

 wavy lines of minute asperities; each segment having one or two transverse 

 rows of four to six very small setigerous punctures upon both the dorsal and 

 ventral disks. Legs slender; first joint of the posterior tarsi slightly shorter 

 than the next two together, as long as the last two, one-half longer than the 

 second. Length 4.0 mm. 



Monterey Co.. 2. ? 



Described from the female in which the sixth segment is 

 very evenly rounded behind. There are many erect bristling 

 setce on the abdomen toward tip; the transverse series of dis- 

 cal punctures upon the abdomen are characteristic of this 



