AMERICAN COLEOPTERA. 257 



Form oblong-oval. 



Male with anterior tarsi moderately dilated, the first joint of middle 



tarsus not much thickened simplex % Say. 



Female with ventral segments not foveate simplex 9 Say. 



Anterior femora with the lower edge rounded, punctate aud without 

 trace of tubercle in male. 

 Form oblong, body distinctly coarctate at base of elytra. 

 Male with anterior tibise with a slight sinuation within the tarsi 

 moderately dilated, the first joint of middle tarsus slightly thick- 

 ened ...basillaris % Say. 



Female with ventral segments 5 — 6 rather deeply longitudinally 



impressed at middle basillaris 9 Say. 



Form oval, margins of thorax and elytra nearly continuous. 



Male anterior tibise simple, the tarsi moderately dilated, first joint 



of middle tarsus slightly thickened clavicornis % Lee. 



Female with ventral segments 5 — 6 vaguely impressed. 



clavicornis 9 Lee. 

 Elytra very distinctly, transversely, finely strigose. 



Male anterior tibise simple, the tarsi moderately dilated, the first 



joint of middle tarsus slightly thickened decipieiis % n. sp. 



Female with ventral segments simple decipiens 9 ^- sp- 



Hind angles of thorax rectangular, the thoracic and elytral margins continuous. 

 Male anterior tibiae stouter, rather suddenly narrowed at base, the 

 tarsi moderately dilated, first joint of middle tarsus thick. 



termiiians % Lee. 



Female with abdomen not impressed terminaus 9 Lee. 



C. egena n. sp. — Oblong, narrower in front, pieeous, elytra luteous be- 

 coming piceous from the middle to tip, surface pubescent. Head moderately 

 densely punctate. Antennse piceous, two or three basal joints pale. Thorax 

 about one-fourth wider than long, not narrowed in front, sides very little 

 arcuate, anterior angles rounded, hind angles obtuse, base feebly arcuate, 

 surface moderately densely punctate. Elytra oblong-oval, wider than the 

 thorax, somewhat more attenuate posteriorly, sutural stria moderately deeply 

 impressed, surface faintly substriate, moderately densely jjunctate. Body 

 beneath moderately densely punctulate. Legs piceous, tibise and tarsi usually 

 paler. Length .14 — .16 inch; 3.5 — 4 mm. 



In both sexes the lower edge of the anterior femora is rounded. 

 In the male the anterior tihiie are distinctly sinuate on the inner 

 side at middle, the anterior tarsus and the first joint of the middle 

 rather feebly dilated. The last two segments of the abdomen are 

 simple in both sexes, without grooves or impressions. 



This species might be mistaken for basiUaris Say, but the nar- 

 rower thorax together with the sexual characters will serve to dis- 

 tinguish it. 



Occurs m Alaska. 



C. luridipeniiis Mann. ( Catops). — Oblong-elongate, piceous, elytra brown- 

 ish, surface pubescent. Head rather coarsely and moderately densely punctate. 

 Antennse piceous, basal half pale. Thorax more than half wider than long, 



TRANS. AMEK. ENT. SOC. TUI. (33) AUGUST, 1880. 



