248 Trans. Acad. Set. of St. Louis. 



sinuate to the base, which is barely three -fifths as wide as the dislc; 

 surface deeply sulcate, strongly convex, with a short transverse 

 impression just before the base at each side of the middle, the punctu- 

 lation very minute, not asperate, sparse and subobsolete; scutellura as 

 in the preceding group; elytra three-fourths wider and barely a third 

 longer than the prothorax, sparsely and extremely minutely puactulate, 

 convex, the post-scutellar Impression distinct; abdomen much nar- 

 rower than the elytra, parallel and straight at the sides, arcuately nar- 

 rowing near the tip, the sculpture not at all asperulate but with very 

 fine and moderately close-set, nearly simple puactulation, which 

 becomes less minute, sparser aud somewhat asperate toward base, the 

 basal impressions with coarse, deep, crowded punctures, the inter- 

 spaces being sublinear. Length 2.0 mm.; width 0.6 mm. Colorado 



( Canon City) and New Mexico (Las Vegas) snbsiniilis n. sp. 



Basal joint of the antennae narrower, more cylindric 5 



5 — Form, coloration and sculpture nearly as in subsimilis, polished, cas- 

 taueous; head larger, wider than long, more broadly truncate and less 

 arcuate at base than in subsimilis, parallel at the sides, with the angles 

 much more narrowly rounded, sparsely, inconspicuously punctulate; 

 antennae rather thicli and distinctly incrassate di-tally, barely extend- 

 ing to basal third of the elytra, the second joint somewhat longer than 

 the third, joints seven to ten very disctinctly wider than long; prothorax 

 fully as wide as long, equal in width to the head, the sides anteriorly very 

 strongly rounded, more prominent than in subsimilis, thence strongly 

 convergent, and broadly, strongly sinuate to the base, the deep sulcus 

 and fine sparse punctulation nearly as in subsimilis; elytra and abdomen 

 nearly similar, the latter somewhat broader and fully as wide as the 

 elytra, parallel with slightly arcuate sides, arcuately narrowing toward 

 tip, the fine punctulation rather more close-set, the impressions simi- 

 larly sculptured. Length 2.2 mm. ; width 0.62. Texas (Austin). 



texaua n. sp. 

 Form rather more elongate, larger, polished, piceous-black, the prothorax 

 and basal parts of the abdomen very slightly paler, rufescent; legs 

 pale, the antennae fuscous; pubescence scarcely noticeable; head nearly 

 as in texana, the antennae similar In length, moderately incrassate dis- 

 tally, the second joint distinctly longer than the third but scarcely 

 thicker, eighth to tenth wider than long; prothorax as long as wide, 

 slightly wider than the head in the female but not obviously so in 

 the male, the sides inflated and circularly rounded anteriorly from the 

 neck to apical two-flths, where they become abruptly and angularly, 

 strongly convergent and sinuate to the base, which is barely three -fifths 

 as wide as the disk; sulcus and fine, sparse punctulation as in the 

 preceding species; elytra three-fourths wider and a third longer than 

 the prothorax, sparsely and almost imperceptibly punctulate, the suture 

 narrowly impressed behind the scutellum; abdomen parallel with 

 feebly arcuate sides, widest at about two-thirds from the base, nar- 

 rower than the elytra, finely, feebly and moderately closely asperulate in 

 sculpture, more coarsely and sparsely toward base, the impressions 

 coarsely and closely punctured; basal joint of the hind tarsi fully as 



