64 Trans. Acad. Sci. of St. Louis. 



impressed; sixth ventral in the female almost completely unmodified. 

 Length 6.0-7.0 mm. ; width 1.0-1.1 mm. California (Placer Co.). 



compoteus Lee. 

 Smaller species and rather more slender, with the elytral punctures nor- 

 mally coarse and deep and rather widely spaced; head small, very 

 much narrower than the elytra in both sexes, the eyes moderate in size 

 and prominence, at about two- thirds more than their own length from 

 the base, the sides moderately converging behind them to the broadly 

 rounded basal angles, without distinct sexual difference, the base rather 

 broadly truncate; antennae nearly as in compotens; prothorax rather 

 narrow and elongate-oval, fully as wide as the head in the female and 

 nearly so in the male, widest and broadly arcuate at the sides at apical 

 third; elytra quadrate, without much sexual difference, about as long 

 as the prothorax in both sexes but distinctly wider; abdomen parallel, 

 a little narrower than the elytra. Male with the apex of the fifth ven- 

 tral feebly sinuate toward the middle, the slit of the sixth narrow, fully 

 three times as deep as wide, with the sides nearly straight and parallel, 

 the bottom rather more narrowly but eveuly rounded, the adjoining 

 surface not impressed, the sixth ventral in the female feebly impressed 

 along the middle. Length 5.5-6.7 mm.; width 0.8-0.95 mm. New 



Mexico, Utah and Wyoming nevadensis Aust. 



5_Elytramuch abbreviated, much shorter than wide, with the basal angles 

 very broadly rounded and the sides thence diverging to the apex, the 

 hind wings probably vestigial. Body slender, parallel, convex; head 

 suborbicular, scarcely longer than wide and without perceptible sexual 

 differences, the eyes of the usual size, convex and prominent, the sides 

 behind them rather strongly converging, the basal angles very broadly 

 arcuate and the base somewhat broadly truncate; antennae pale, 

 piceous-black toward the middle; prothorax very slightly narrower than 

 the head, elongate-oval, widest behind apical third; elytra without 

 sexual differences, very much shorter than the prothorax and about 

 tqual in width to the latter, coarsely, deeply and moderately sparsely 

 punctured; abdomen subparallel, fully as wide as the elytra. Male 

 with the apex of the fifth ventral transversely truncate, the slit of the 

 sixth narrow and about three times as deep as wide, with its sides 

 parallel and nearly straight, ogivally rounding toward the bottom, the 

 latter rather narrowly rounded and narrowly beveled, the adjoining 

 surface apparantly not impressed; sixth ventral of the female narrowly 

 and very feebly impressed on the median line. Length 4.4-4.9 mm.; 



width 0.75-0.8 mm. Iowa palastris Aust. 



Elytra subquadrate and parallel or very nearly so, with the basal angles less 



broadly rounded, the hind wings developed 6 



6 — Elytral punctures much less coarse and deep than usual and very sparse. 

 Body slender, subparallel, colored throughout as in the preceding, the 

 head subsimilar in the sexes, rather small, distinctly narrower than the 

 elytra, elongate-suboval, the eyes convex but rather small, at nearly 

 twice their own length from the base, the sides distinctly converging 

 behind them and broadly, feebly arcuate to the obtuse basal angles very 

 near the neck, the angles moderately broadly rounded; prothorax 

 elongate-oval, distinctly narrower than the head in both sexes, widest 



