AMERICAN COLEOPTERA. 319 



Aiitennse pectinate in the males Group. !• 



Antennce simple in both sexes, either serrate or liliform. 



Joints 3 and 4 of antenna: similar; that is, not liiffL'ring in length and rarely 

 in form. Form usually slender Group II. 



.Joint 3 shorter and narrower than the fourth. Form usually broad. Group III. 



.Joint 3 always distinctly longer than the fourth Group IV. 



GR UP II. 

 C. xanthomus, n. sp. — Elongate, sub-depressed. Thora.Y opaque with very 

 faint tinge of bronze, elytra deep black, feebly shining, with an oval yellow 

 .'<pot on the middle of the base of each elytron. Head coarsely and densely 

 j>unctured. Thorax one-half longer than broad, anteriorly very feebly emar- 

 ginate, angles obtuse, sides nearly straight, slightly sinuate at middle and near 

 the hind angles which are acute divergent and not carinate ; surface feebly 

 convex densely and rather coarsely punctured, the punctures becoming umbi- 

 licate at the sides. Elytra as broad as thorax, sub-depressed, sides feebly 

 rounded, surface finely striate, strise punctured, interspaces finely punctulate 

 and finely rugose. Body beneath black densely punctulate. Tarsi piceous. 

 Antennre with second joint small, third of the same form as the fourth and a 

 very little longer. Length .26 inch ; 6.5 mm. 



Resembles lohatus and tarsalii^, in form, but more depressed and 

 slender than either and may be readily known from all our species by 

 the characters given above. Its position in the series is near the two 

 species above named. 



The above specimen was kindly presented to me by >Ir. James 

 Behrens, of San Francisco, with the catalogue number 977. It was 

 collected at Crystal Springs, California. 



C. Copei, n. sp. — Piceous, with very faint tinge of bronze, hind angles nf 

 thorax and small irregular space at apices of elytra, pale testaceous. Head 

 very coarsely punctured. Antenna: slender, piceous, third joint as long as 

 fourth and similar in form, second joint scarcely longer than half the third 

 Thorax slightly longer than broad, and feebly narrowed in front; sides feebly 

 rounded, hind angles acute, carinate and very feebly divergent; disc moder- 

 ately convex, with feeble median impression, surface with coarse umbilicaie 

 punctures closely placed. Elytra as broad as thorax parallel, obtuse at tip, 

 moderately convex, rather deeply striate, striae punctured, intervals <ionvex ir- 

 regularly punctured. Body beneath piceous black, shining; sparsely j)ubes- 

 oent; thorax very coarsely punctured, pectus and abdomen less coarsely, tin', 

 latter more sparsely. Legs brownish. Length .48 inch ; 12 mm. 



Similar in form to si(jnaticollis, but should be placed near trrc^ and 

 Jivaricatus. Belongs to Group III, Candeze,and may easily be rec(ttr- 

 uised by the characters above given. 



One much injured specimen in my cabinet, collected in southern 

 \'irginia, by Prof E. I>. Cope, to whom I dedicate it with much plea- 

 sure. 



GROUP III. 



C. monticola, n. sp. — Form elongate, slightly attenuate before and behind 



