64 Trans. Acad. Sci. of St. Louis. 
impressed; sixth ventral in the female almost completely unmodified. 
Length 6.0-7.0 mm.; width 1.0-1.1mm. California (Placer Co.). 
compotens Lec. 
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 
parrow 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 theelytra. 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 evenly 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......... si oeb va lanaiew teas nevadensis Aust. 
5—Elytra much 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 
equal 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. ToOWa...... cee cccccevcsecceces+s- palustris Aust. 
Elytra subquadrate and parallel or very nearly so, with the basal angles less 
broadly rounded, the hind wings developed... sccccecccssecccscessse 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 
