198 Trans. Acad. Set. of St. Louis. 



long as the first but thinner, the tenth not quite as long as wide; pro- 

 thorax unusually elongate, only slightly wider than long, the sides very 

 obtusely subangulate anteriorly, thence distinctly converging and 

 straight to the base, the surface strongly impressed along the middle 

 from before the centre nearly to the base, becoming gradually slightly 

 wider but without trace of a transverse ante-basal impression; elytra 

 moderate, two-fifths wider and longer than the prothorax, the humeri 

 only moderately exposed and somewhat rounded, the post-scutellar 

 impression rather narrow and deep; abdomen very distinctly narrower 

 than the elytra parallel and nearly straight at the sides, very closely, 

 punctulate, the deep basal impressions with moderately coarse, deep 

 punctures, which are close-set throughout, but not at all crowded; 

 legs long and not very slender, the hind tarsi pale, three-fourths as long 

 as the tibiae, the first joint very nearly as long as the next two com- 

 bined. Male with a small, broadly angular notch at the apex of the 

 sixth ventral. Length 2.9-3.1; width 0.7 mm. Utah (Provo) and Mon- 

 tana (Kalispell) ,— H. F. Wickham iucrassata n. sp . 



12 — Abdomen parallel and straight at the sides throughout or virtually 



so 13 



Abdomen distinctly narrowed from near the apex to the base 14 



13 — Head larger, nearly as wide as the prothorax, less narrowed at base, the 



neck broader. Form rather stout, strongly convex, shining, black, the 

 legs and antennae rufo-piceous; punctures very minute and only mod- 

 erately close-set; pubescence somewhat coarse and distinct; head with 

 a deep rounded impression at the middle of the vertex; the eyes 

 moderate; antennae thick but only feebly incrassate distally, the 

 third joint slightly longer than the second, but not as long as the first 

 and thinner as usual, the tenth not as long as wide; prothorax only 

 slightly transverse, a fourth or fifth wider than long, the sides ante- 

 riorly broadly rounded, thence moderately converging and nearly 

 straight or less arcuate to the base, the surface, broadly, feebly con- 

 cave toward the median line, except anteriorly, but without a distinct 

 ante-basal transverse impression; elytra well developed, nearly one- 

 half wider and longer than the prothorax, the humeri moderately ex- 

 posed and subrectangular, the post-scutellar impression small and 

 somewhat feeble; abdomen very much narrower than the elytra, the 

 deep basal impressions coarsely punctured, the punctures crowded 

 as in Tachyusa; legs long, rather stout, the hind tarsi with the basal 

 joint about as long as the next two combined. Length 2.6 mm. ; width 



0.68 mm. California (Ojai),— H. C. Fall leyiTentris n. sp. 



Head nearly as in the preceding species. Form rather stout, moderately 

 convex, shining, finely, closely punctulate, the abdomen sparsely so 

 toward base, black, the legs piceous, the antennae brownish- fuscous; 

 head obviously wider than long, rather abruptly constricted at base 

 with rounded angles, the eyes at much less than their own length 

 from the base in the male, scarcely as large in the female, the vertex 

 with a small, strong and rounded impression in the former, which 

 becomes much larger in the latter sex, its bottom punctureless and 

 polished; antennae extending rather beyond the middle of the elytra, 

 slender, gradually and feebly incrassate distally, the second joint eri- 



