AMERICAN COLEOPTERA. 175 



dig^inct type. The surface is opaque and of velvety aspect, the elytra 

 varying in color from reddish brown to deep black, the margin from 

 purple to golden and with large punctures ; the surface of the elytra 

 has extremely feeble sculpture in which faint traces of striae are visible 

 with obsolete punctures. Three of the intervals are very slightly 

 wider and somewhat more convex. The diiFerence in length between 

 the posterior femora of the two sexes is partly real and partly apparent 

 only, a measurement in two specimens of equal size shows that in the 

 male the femora are .40 inch long, in the female .35 while in the 

 former sex they appear to project at least one-third behind the tips 

 of the elytra, this results from the greater abruptness and less pro- 

 longation of the tip in the % . 



The maxillary character is of the greatest importance in separating 

 this species. Everywhere else in the Cychrus series the inner lobe 

 of the maxillas has merely silken hairs with a few shorter and stiflFer 

 hairs placed in a row, corresponding with the row of long stiff spines 

 noticed here. 



One species in our fauna possesses the above characters. 



C angiisticollis Fisch., Ent. Russ. ii, p. 46, pi. 46, fig. 2; loc. cit. iii, 

 p. 143; Dej. Spec, v, p. 526; velutinus Menet. Bull. Ac. Petrop. 1844, ii, p. 53. — 

 Form elongate. Head elongate, gense broadly notched. Thorax elongate cord- 

 ate, sides in front feebly arcuate, posteriorly feebly sinuate, hind angles rect- 

 angular, disc nearly flat, impressions feeble. Elytra elongate oval broadest 

 behind the middle, feebly convex, margin bluish or golden and with large 

 punctures, surface very obsoletely striate, punctures obsolete, three of the 

 intervals somewhat more distinct, inflexed portion not distinctly punctate. 

 Length .66—1.00 inch; 17—25 mm. 



Under this name I think it advisable to unite the two species above 

 cited. The Arctic forms have a slightly shorter thorax and the elytra 

 brown and the margin more golden ; those from northern California 

 and Oregon, are of velvety black color and with the margin black or 

 bluish, the thorax is also longer. 



Occurs from Alaska to northern California. 



BRENNUS Motsch. 



Bull. Mosc. 1865, ii, p. 311. 



Head elongate, neck not dilated, genae in front of eyes dilated, 

 covering the base of the maxillae and divided by an incisure varying 

 in extent in the species; gula either plane or transversely impressed, 

 front moderately convex or cristate. Eyes feebly or moderately convex, 

 usually distant from the thorax. Antennae slender longer than half 

 the body, the basal joint usually normal but in several species stout, 



