(5 CALIFORNIA ACADEMY OF SCIENCES. 



This species maj be distinguished by its black color, 

 dark legs and coarse pubescence of the head, but especiall}' 

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

 are not distinctly rounded. 



4 — C. mobile u- sp. — Eather slender, black thronghoiit, apices of the elytra 

 jiist visil)ly paler, fuscous; legs clarkbrowu, castaueous, tarsi testaceous; an- 

 teunre piceous, fuscoxis toward tip; pubescence of the elj'tra and abdomen 

 very fme, short and extremely dense, sericeous, fulvous, that of the head and 

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

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

 angles rather broadij' rounded; surface moderately convex, rather coarsely 

 and denselj' punctate, more finely so behind, with a narrow median imprinc- 

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

 large setigerous punctures; labrum Avith four small, robust, triangular teeth; 

 antenn;e distinctly shorter than the head and jirothorax together, very feebly 

 incrassate, rather slender; basal joint as long as the next two together, sec- 

 ond scarcely two-thirds as long as the third and eqi;al in length to the fourth, 

 tenth slightly longer than wide. Prothorax nearly tjuadrate; sides parallel 

 and distinctly arcuate; base and apex evenly, rather strongly, and nearly 

 equallj' arcuate, the latter with a small feeble median sinuation; ajiical angles 

 rather broadly rounded, basal very broadly so; disk transverselj' and rather 

 feebly convex, very slightly wider than the head, evenlj' tinely and extremely 

 densely punctate; punctiTres 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 broadlj', 

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

 convex, one-fourth longer than wide, nearly one-half longer than the iDrouo- 

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

 finely and very densely punctate; puuc-tures slightly asperate and much finer 

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

 ment feebly 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 puncluros upon both the dorsal and 

 ventral disks. Lajfi 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. 5 



Deseril)ed from the female in which tlie sixth segment is 

 very cveidy r(.)un(led Ix^hind. Tliere arc many erect bristling 

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

 cal punctures upon the abdomen arc characteristic of this 



