AMERICAN COLEOPTERA. 181 



This species is easily known in this group by the oblique sides 

 of the thorax, in this respect however it resembles mar(jinatus var. 

 Fulleri, but from this it may be known by the elytral striae number- 

 ing eighteen. 



The specimens I have seen have been reported frpm Sacramento, 

 San Diego and Los Angeles. 



C striatum Lee, Proc. Acad. 1859, p. 69; crenatus Motsch. Biill.Mosc. 1859, 

 iii, p. Ifil, pi. 3, fig. 8.— Moderately elongate, black, sbiniag. Head elongate, 

 smooth, genae deeply incised. Thorax somewhat variable in form, usually 

 elongate cordate, sides in front arcuate, posteriorly moderately sinuate, hind 

 angles rectangular, margin verj' narrow, disc feebly convex, impressions moder- 

 ately deep. Elytra oval, moderately ventricose, surface deeply striate, striae 

 rather closely but not coarsely punctured, intervals convex, feebly interrupted 

 at the sides and near the tip, inflexed portion obsoletely punctate. Body be- 

 neath smooth, shining. Length .60 — .34 inch; 15 — 21 mm. 



The elongate form of thorax is the essential character of this 

 species, and although somewhat variable never approaches the form 

 of ventricosus. The elytra are moreover more deeply striate and with 

 6ner punctures than in ventricosus. The form of thorax as given by 

 Motschulsky for this species is a caricature, but that given of avails 

 is accidentally quite near what belongs to this species. 



All the specimens I have seen are from Tejon and Santa Barbara, 

 California. 



C. ventricosus Dej., Spec, v, 1831, p. 527; Esch. Zool. At). 1833, p. 21, 

 pi. 25, fig. 1. — Moderately elongate, black, shining. Head moderately elongate, 

 gense acutely notched at the sides. Thorax cordate, as broad as long, sides 

 in front arcuate, posteriorly deeply sinuate, hind angles rectangular, margin 

 moderately reflexed, basal impression moderately deep, the others feebler, 

 disc feebly convex. Elytra oval, ventricose, multistriate, striae with punctures 

 moderate and rather approximate, intervals feebly convex, inflexed portion 

 obsoletely sparsely punctate. Body beneath smooth, shining. Length .64 — .86 

 inch; 16—22 mm. 



The differences between this species and striato-punctatus when the 

 females only are present are not easy to make known by description, 

 and will be fully dealt with after that species. The males once known 

 the other sex can be determined, but even then a practised eye is of 

 more value than empirical characters. 



Numerous specimens have been sent me from time to time by 

 Messrs. Edwards and Behrens of San Francisco, all of them having 

 been collected near San Mateo or Crystal Springs. 



I have a specimen in which the elytra are elongate oval, twice as 

 long as wide, it is the extreme of my series and if seen alone with 

 one of the fully ventricose specimens, might be supposed to represent 



