20 FRKDKRICK BLANCHARD. 



California, Soutliei'ii C'alifoi'uia, Oregon, Washington Territory, 

 Vancouver's Island. In various collections. 



The large o])aque thorax, the flattened intervals and the acuminate 

 tip of the elytra distinguish this species. 



22. C tenebrosus Lee— Form elonsiite, iiai-allel, black or soniewliat 

 lironzed, clothed with fine fnscnus or cinereous pubescence and suberect bristles. 

 Antemuie black, rather slender, lonojer in the % , with the joints thicker, some- 

 times much stouter. Head and thorax moderately to strongly pnnctulate, with 

 sparser coarse punctures intermixed, thorax moderately convex, disc usually 

 narrowly impressed from before the middle nearly to base, basal plicae long, lobi' 

 feebly trideiitate, the median tooth more or less obsolete, sides strongly rounded 

 and narrowed before, less narrowed and usually sinuate behind, the angles 

 slightly or not divergent. Elytra a little wider than the thorax, moderately con- 

 vex, sides aubparallel, rounded and narrowed at apical third to tip, striae punc- 

 tate, feebly to well impressed, intervals flat or moderately convex more or less 

 punctulate with coarser punctures more or less evident. Body beneath closely 

 jiunctulate with scattered coarser punctures, except on the propleurge, submar- 

 ginal lines impressed, usually reaching in front of middle, but sometimes shorter 

 or very short, intercoxal lines disappearing behind, sometimes quite obsolete be- 

 tween the coxae, hind coxal plates variable, usually narrowed externally with 

 the angles strongly rounded, but sometimes transverse behind. Legs varying 

 from entirely black to entirely red, sometimes slender and with the tibiae, mod- 

 erately spinous, or stouter, with the tibiae more strongly spinous, tarsi usually 

 with the first joint distinctly shorter than the last, but also sometimes subequal 

 to it. Length .23-.44 inch ; 5.7-11 mm. 



Nebraska, Colorado, Wyoming, Idaho, JNIontana, Oregon, Wash- 

 ington Territory, Vancouver's Island, California, Nevada. 



A wide spread and variable species, difficult to limit exactly, but 

 while five or six extremes of variation can be })ointed out depending 

 somewhat upon locality, they appear to be connected by intermediate 

 forms. C. fdlvipes is one of these varieties, C. viontanua Bland 

 another, and has no relati(ju to tamidicoUis, of which it has been 

 made a synonym. Nearly a hundred specimens from the various 

 localities indicated have been examined showing considerable varia- 

 tion in all characters. The punctuation is variable, but usually 

 moderate, never so strong as in latlusculus ; when it is strong the 

 strife of the elytra are frequently more im])ressed. The jjrosternal 

 ])rocess is usually well developed and but slightly elevated behind, 

 but it is, however, sometimes seen to be more strongly elevated, 

 usually in smaller and feeble specimens, and in that event dependence 

 must be })laced upon other characters. In one variety or race from 

 California, with more cinereous i)uhescence, black legs and the thorax 



