242 
Trans. Acad. Sci. of St. Louis. 
narrower than the elytral apex and but just perceptibly dilated poste- 
riorly. Male with the fifth ventral unmodified as usual, the very acute 
notch of the sixth cuspidiform, with its sides gradually more flaring 
posteriorly and broadly arcuate, the opening about half as wide as the 
segmental apex but scarcely as wide as the depth. Length 3.9 mm.; 
width 0.58 mm. California (Yuma) and Arizona (Tugson and Sta. 
Rita Mts). .ccescvcccgececnccenesonheaeot=seees ness COMMIVOMELIS Ms BD. 
Form nearly similar throughout to the preceding but obviously stouter in 
every part, the eyes similarly moderate in size but very convex and 
prominent, the basal part of the head behind them more broadly arcuato- 
truncate at base and not semicircularly rounded; prothorax less elon- 
gate but nearly similar in form; elytra slightly elongate, somewhat 
wider than the head but less obviously so than in ¢enuiventris, two-fifths 
wider and longer than the prothorax; abdomen moderately slender, at 
base slightly narrower than the elytral apex, distinctly dilated behind 
and very much more obviously so than in the preceding species. Male 
not at hand, the comparisons made from females exclusively. Length 
4.1 mm.; width 0.65 mm. Texas (El Paso) and Arizona (locality not 
FOCOTOE)psivnccsamadhsnerandes scodictesedce settee us ok sess MGMELNe AlObs 
17 — Elytra much longer than the prothorax; abdomen never as wide as the 
elytra, moderately punctato-asperate, the notch of the sixth ventral in 
the male rather large, cuspidiform; body invariably slender, generally 
pale in color; antennae filiform, only very slightly thicker toward tip as 
USMAl 2. eceeee § seen oes Sub u siekess Dae bLERE SEOs DA Ch Obes bake 66 ke we S -18 
Elytra subequal in length to the prothorax, the body stouter, the abdomen 
generally black, coarsely punctato-asperate and much wider than the 
elytra; notch of the sixth ventral in the male very small, triangular; 
antennae strongly incrassate toward the tip....... seehbasdaee eee ton 19 
18— Abdomen broader, much wider than the prothorax. Parallel, dark 
rufo-testaceous in color throughout, the last two abdominal segments 
nubilously blackish; head elongate, of the usual form, equal in width to 
the elytra, the eyes moderate in size, very convex and prominent, at 
more than their own length from the base, the basal part broadly obtrap- 
ezoidal, with broadly rounded angles and arcuato-truncate base; pro- 
thorax rather small, longer than wide, much narrower than the head, 
the sides obtusely angulate and only slightly rounded anteriorly, thence 
rather feebly converging and nearly straight to the broadly subcircular 
base; margins with a black seta anteriorly and posteriorly; elytra longer 
than wide, parallel, only slightly narrowed at the immediate apex, fully 
a third wider and longer than the prothorax; abdomen at base much 
narrower than the elytra, gradually enlarged toward tip. Male with 
the fifth ventral unmodified, the acutely angulate notch of the sixth 
having gradually more widely diverging simple arcuate sides, the open- 
ing nearly three-fifths as wide as the segment and wider than the 
depth. Length 3.25 mm,; width0.6 mm. Montana (western), — Mr. 
Wickham. ...e sec cccese cece cece cecerce cece sececescoees SCtAtOr 1. Sp. 
Abdomen narrower, not distinctly wider than the prothorax even poste- 
riorly, Parallel, dark brownish-testaceous in color throughout, the 
head generally slightly darker than the prothorax and elytra and the 
abdomen black toward tip; head moderately developed, perceptibly 
