260 MEMOIRS ON THE COLEOPTERA 



punctate, the punctures isolated over a rather shining surface, the 

 two ridges strong, the intermediate broadly prominent and rugose; 

 abdomen as in atrum; hind tarsi short and very slender, the second 

 joint twice as long as wide. Length (9 ) 10.0 mm.; width 2.8 mm. 

 Colorado (Boulder Co.) parvicorne n. sp. 



8 Form rather stout, unusually large in size; head strongly and closely 

 punctate, rather impressed centrally; antennae (9) extending to 

 basal fifth of the elytra, not very stout, pale brown, moderately 

 pubescent, the hairs pale yellowish, the tenth joint more than twice 

 as long as wide, the process of the eleventh unusually short, not half 

 as long as the basal part; prothorax one-half wider than long, dis- 

 tinctly narrower than the elytra, the sides bluntly angulate only just 

 behind the middle; surface very convex, with an unusually large and 

 deep central concavity occupying about median fourth of the width, 

 the granules coarse, strong and isolated on the shining surface; 

 scutellum black, broadly rounded at tip, closely punctate; elytra 

 slightly more than twice as long as wide, parallel, arcuately narrowing 

 in about apical fourth, the apices very obtuse, exposing the last 

 dorsal, which is as long as wide, obtrapezoidal with rounded tip, 

 its surface very minutely, closely and clearly punctate on the pale 

 background; two medial ridges and the sublateral all strong, the 

 intermediate very feeble; abdomen deep black, punctulate as usual; 

 legs black, pale distally, the hind tarsi nearly as usual. Length (9 ) 

 15.5 mm.; width 4.8 mm. Wyoming (Laramie).. . .fulvipenne n. sp. 



Form less stout and less convex, the elytra less pallid; head strongly, 

 closely punctate, impressed along the median line; antennae (9) 

 short but rather slender, of the usual form; prothorax short, rather 

 more than one-half wider than long, parallel, the sides almost evenly 

 and subcircularly rounded; surface shining between the isolated 

 and very distinct granules, only moderately convex, feebly tri- 

 impressed medially along a transverse submedian line; scutellum 

 black, nearly as in the preceding; elytra parallel, barely visibly 

 wider than the prothorax, finely, very densely punctate and rather 

 dull, the ridges distinct; exposed last dorsal segment but little wider 

 than long, its entire contour very evenly parabolic; abdomen cas- 

 taneous, minutely, sparsely punctate but rather distinctly pubescent; 

 tarsi as usual, darker than in the preceding species, from which the 

 present differs in its much narrower form, shape of the last dorsal 

 segment, less impressed and shorter, less convex prothorax and many 

 other structural features. Length (9) 13.0 mm.; width 3.8 mm. 

 British Columbia (Aldermere), communicated by Rev. J. H. Keen. 



costulatum n. sp. 



9 Form much narrower and more convex, black, the scutellum and 

 elytra dark red-brown; head densely and deeply punctate, scarcely 

 impressed; antennae (c?) fully one-half as long as the body, black, 

 slender, of the usual general structure and vestiture, the joints 

 beyond the fifth abruptly shorter and still more slender, sixth and 

 seventh equal, tenth more than twice as long as wide; prothorax 

 convex, barely one-half wider than long, but slightly narrower than 

 the elytra, angulate or more narrowly rounded at the sides just behind 



