126 Trans. Acad. Sct. of St. Louis. 
thorax, the punctures coarse, arranged in scarcely impressed regular 
series; abdomen but slightly narrower than the elytra, finely, rather 
closely punctulate. Male with the surface of the fifth and sixth ventrals 
wholly unmodified, the apex of the former broadly, very feebly sinuate 
toward the middle; sixth with a broadly rounded, shallow, gradually 
formed parabolic sinus, half as wide as the apex and about four times 
as wide as deep; female not differing greatly, the antennae nearly sim- 
ilar in structure. Length 7.3mm.; width 1.22 mm. Texas (El Paso),— 
Mr. G. W. Dunn — and New Mexico....-..e.+eeee6 «+-ACOMANA ND. Sp. 
Form ratner .ess stout and more elongate, similar in coloration, the testa- . 
ceous parts brighter; head similar, the eyes a little larger, at barely 
one-half more than their own length from the base; prothorax narrower 
and more elongate, nearly a fifth longer than wide, not evidently wider 
than the head, the sides straight and parallel, the basal angles broadly 
rounded, the anterior right, scarcely more than blunt, the punctures 
only moderately coarse, feeble and very sparse, larger and closer but 
confused along the median smooth space; elytra distinctly elongate, 
parallel, a fifth wider and almost a fourth longer than the prothorax, the 
punctures rather small, impressed, arranged in regular and broadly im- 
pressed lines, except toward apex, where they are confused; abdomen 
somewhat narrower than the elytra, the punctures minute and not very 
close-set. Male with sexual characters similar to the preceding, the 
fifth ventral feebly sinuato-truncate throughout the width, the sinus of 
the sixth similar in form, three-fifths as wide as the apex. Length 7.5. 
mm.; width 1.15 mm. Montana (western), Utah (Provo) and Arizona 
(Winslow and East Bridge), — Mr. Wickham.........rubricollis n. sp. 
10 — Body rather stout, parallel and less depressed than usual, moderately 
convex, shining, rufo-testaceous, the legs and antennae concolorous, 
the abdomen uniform in color throughout and rather pale piceo-rufous; 
head as wide as long, parallel and straight at the sides, the angles well 
rounded, the punctures coarse and rather close-set, the eyes unusually 
small, at much more than twice their own length from the base; an- 
tennae fully as long as the head and prothorax, moderately slender, 
very gradually and strongly incrassate distally, the medial joints two- 
thirds longer than wide; prothorax oblong, distinctly elongate, not quite 
as wide as the head, the sides subparallel and nearly straight, broadly 
rounding toward base, the punctures rather coarse and only moderately 
sparse, slightly more aggregated narrowly along the median smooth 
space; elytra but little longer than wide, parallel, about a fifth wider 
and longer than the prothorax, somewhat wider than the head, the 
punctures rather coarse, only moderately sparse and very uneven, only 
partially arranged in uneven series; abdomen distinctly narrower than 
the elytra, the punctures much coarser than usual above and beneath 
and rather close-set. Male with the surface of the fifth and sixth ven- 
trals wholly unmodified, except a narrow impunctate and glabrous un- 
impressed line along the middle of each throughout, the apex of the 
former broadly, very feebly sinuate toward the middle, the sixth with a 
deep angulate notch at apex, the notch with straight sides rounding 
outwardly toward tip, a little deeper than wide, half as wide as the 
