196 Trans. Acad. Sci. of St. Louis. 



tinct; elytra about two-flfths wider and nearly one-half longer than the 

 prothorax, the sutural impression behind the scutellum broad and 

 feeble; abdomen with the segments feebly convex, the border only 

 moderately thick, the basal impressions more coarsely punctured but 

 with the punctures extremely obsolete, so that they appear to be im - 

 punctate and polished ; legs rather short but slender, the hind tarsi flli - 

 form, two-thirds as long as the tibiae, the basal joint not quite as long 

 as the next two combined. Male with a small, extremely shallow , 

 rounded sinus at the tip of the sixth ventral plate. Length 2.3 mm.; 

 width 0,65 mm. Manitoba (Winnipeg) ..manitobae n. sp. 



7 — Form narrow, elongate, parallel, convex, moderately shining, castan- 



eous, the abdomen blackish posteriorly, the antennae plceous, the legs 

 testaceous; punctures anteriorly very fine, moderately close, of the 

 elytra stronger, closer and asperulate, of the abdomen less close and 

 feebly asperulate ; pnbescence rather inconspicuous ; head small, with a 

 very small faint impression at the middle of the vertex; antennae stout, 

 the second and third joints much less elongate than usual, equal and 

 each much shorter than the first; prothorax of the usual form, rather 

 more than a third wider than long, much wider than the head, the sides 

 converging and nearly straight from anterior third to the base, broadly 

 rounded anteriorly; surface convex, not evidently impressed along the 

 median line, the short transverse ante-basal impression confusedly 

 foveolate; elytra about two-flfths wider and longer than the prothorax, 

 the apical external angulation rather stronger than in the preceding 

 species, the post-scutellar impression broad and feeble; abdomen 

 slightly narrowed from apical third to the base but distinctly narrower 

 than the elytra at every part, the first three tergites more convex, 

 broadly and deeply impressed at base both dorsally and ventrally, with 

 the impressions coarsely and closely punctured, the entire conformation 

 recalling Tachyusa; legs rather long, the hind tarsi three-fourths as 

 long as the tibiae, the first joint as long as the next two combined ; sixth 

 ventral evenly rounded at tip, broadly in the male. Length 2.4-2.8 mm. ; 

 width 0.6 mm. British Columbia. (Kamloops and Glenora), — H. F. 

 Wickham breyicornis n. sp. 



8 — Prothorax widest at about apical third as usual, the hind angles obtuse 



but distinct and not at all rounded; basal impressions of the abdomen 



always coarsely and distinctly punctured. 9 



Prothorax widest only slightly before the middle, the hind angles narrowly 

 rounded as well as obtuse ; basal impressions of the abdomen virtually 

 impunctate. lOnypetoma n. subgen.] 19 



9 — Species of the Atlantic Coast region 10 



Species of the Rocky Mountain regions 11 



Species of the Pacific Coast fauna •12 



10 — Form only moderately stout, convex, shining, deep black throughout, 



the antennae piceous-black, the legs dark piceo-testaceous ; punctures 

 very fine, rather close-set but inconspicuous, equally close but still 

 finer on the abdomen ; pubescence not conspicuous ; head wider than 

 long, strongly impressed along the median line at the middle of the 

 vertex, where the surface becomes subimpunctate, more broadly 

 anteriorly; eyes large; neck very wide; antennae nearly as long as 



