AMERICAN COLEOPTERA. 177 



striate, striae often entirely obsolete and replaced by moderately large punc- 

 tures, the regular striae with smaller punctures, intervals near the sides and tip 

 more or less interrupted and subgranular, inflexed portion of elytra obsoletely 

 sparsely punctate. Body beneath and legs impunctate. Length .58 — .72 inch; 

 15—18 mm. 



The number of striae cannot be definitely stated, it is however over 

 sixteen, the punctures of the normal striae appear to become smaller 

 while near the tip those of the intervals become somewhat larger and 

 the count thereby is apt to be confused. The hind angles of thorax 

 are sometimes slightly divergent. The males have the first three joints 

 slightly dilated and papillose beneath, the space so clothed being very 

 small on the first joint. 



Occurs not uncommonly near San Mateo, southward of San Fran- 

 cisco, California. 



C. rugiceps Horn, Trans. Am. Ent. Soc. iv, 1872, p. 143. — Form nmder- 

 ately elongate, black, feebly shining. Head moderately elongate, vertex ele- 

 vated into an irrearular obtuse crest, supra-orbital ridges well defined, front 

 transversely impressed between the base of the antennae, occiput not impressed, 

 genae moderately dilated, incised beneath the eyes. Antennae slender, basal 

 joint large and stout. Thorax cordate, moderately constricted posteriorly, sides 

 in front arcuate, posteriorly sinuate, hind angles rectangular, margin with a 

 slightly thickened bead, disc feebly convex, anterior, median and basal lines 

 not deeply impressed. Elytra regularly oval, margin narrowly reflexed, disc 

 moderately convex, surface with about eighteen moderately deeply impressed 

 striae in which the punctures are coarse but not approximate, intervals convex, 

 inflexed portion nearly smooth. Body beneath and legs smooth. Length .54 — ■ 

 .66 inch; 14—17 mm. 



The sculpture of the head recalls that seen in certain species of 

 Clivina but with a more elevated carina. The thorax by its more 

 feebly impressed line recedes from the other cristate species and 

 approaches punctatus. The male characters are as in cristatus. 



I have seen but two specimens one of each sex, both collected by 

 Lord AValsingham, in Oregon. The male is now in my cabinet. 



Group II. "^ 



Head not cristate, antennae slender, basal joint not thickened, genae 

 moderately explanate and more or less incised, gula not transversely 

 impressed. Anterior tarsi of male with either two or three joints 

 papillose or spongy pubescent beneath, sometimes with the fourth 

 joint slightly papillose. 



This group contains the larger number of species which represent 

 more definitely the generic idea than those of the other two groups, 

 and by their homogeneity of appearance and general characters they 

 form a very natural assemblage, with such close resemblances that the 



TRANS. AMER. ENT. SOC. VII. (23) DECEMBER, 1878. 



