126 Trans. Acad. Sci. 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 7.3 mm.; width 1.22 mm. Texas (El Paso),— 

 Mr. G. W. Dunn — and New Mexico acomana n. sp . 



Form rainer .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 lmpunctate 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 



