304 GEO. H. HORN, M. D. 



angular, r.ot prominent, surface obsoletely sparsely punctulate. Elytra oval 

 slightly longer than wide, not wider than the thorax, sides gradually arcu- 

 ately narrowing to apex, surface with six moderately well-defined striae of 

 coarse punctures, the intervals and sides of elytra with finer punctures not 

 densely placed. Body beneath sparsely punctulate, shining. Length .08 inch : 

 2 mm. 



Male. — Anterior and middle tarsi moderately dilated. Tarsi 5 — 5 — 4. 



Female. — Tarsi slender 4 — 4 — 4. 

 Occurs in western Nevada, (Morrison). An easily known species. 



A. bistriatutn n. sp. — Broadly oval, convex, semi-contractile, piceous, 

 moderately shining. Head sparsely punctulate, clypeus rufous. Thorax more 

 than twice as wide as long, narrowed in front, base broadly arcuate, sides 

 moderately arcuate, hind angles rectangular but not prominent, surface im- 

 punctate. Elytra broadly oval, nearly as wide as long, base at sides slightly 

 oblique, humeri very distinct, sutural stria moderately impressed, surface 

 moderately coarsely but not densely punctate with two feeble striae of punc- 

 tures on the disc. Body beneath sparsely punctulate. Length .10 — .12 inch ; 

 2.5—3 mm. 



Male. — Anterior and middle tarsi moderately dilated. Tarsi 5 — 5 — 4. 



Female. — Tarsi slender 4 — 4 — 4. 



This species resembles some of the forms of concinnum but the 

 latter is more contractile, hind angles rounded, elytra without striae 

 and the female tarsi difiFerently formed. 

 Occurs in western Nevada, (Morrison). 



A. estriatum n. sp. — Broadly oval, convex, semi-contractile, piceous, 

 shining, thorax orange-red. Thorax more than twice as wide as long, nar- 

 rowed in front, apex feebly emarginate, base and sides arcuate, hind angles 

 obtusely rectangular, surface very sparsely and minutely punctulate. Elytra 

 oval, a little longer than wide, base at sides slightly oblique, humeri distinct, 

 sutural stria moderately impressed posteriorly, surface moderately densely but 

 irregularly punctured with coarse and finer punctures intermixed. Body 

 beneath sparsely finely punctulate. Length .10 inch; 2.5 mm. 



Male. — Anterior and middle tarsi slightly dilated. Tarsi 5 — 5 — 4. 



Female. — Unknown. 



This species has some resemblance to concinnuvi and angidare^ but 

 is intermediate in punctuation and differs from both in the hind angles 

 of the thorax. 



One specimen. Garland, Colorado, (Schwarz). 



A. repentinum n. sji. — Oval, convex, contractile, piceous, shining. Head 

 sparsely punctulate, clypeus slightly prolonged at middle, truncate at tip and 

 corneous. Thorax more than twice as wide as long, hind angles broadly 

 rounded, surface sj)arsely jjunctulate. Elytra oval, very little longer than wide, 

 humeri oblique forming a distinct angle with the sides, sutural stria extremely 

 fine but attaining the middle, surface very distinctly punctate. Body beneath 

 sparsely punctate. Length .08 inch; 2 mm. 



1 have seen but one $ of this species. It might readily be con- 



