NORTH AMERICAN COLEOPTERA. 33 



almost absent in a large space behind the middle of the apical margin. Klytra 

 a little narrower at base than the thorax, gradually wider posteriorly, humeri 

 very obtuse, disc striate, the strite deep closely but finely putictured, intervals 

 convex and finely punctulate. Body beneath si)arsely indistinctly punctate. 

 Mesosternum not carinate. Anterior tibije. smooth in front, strongly trideiitate, 

 externally, but not crenate above, the first tarsal joint shorter than the second. 

 Posterior femora very sparsely punctate, first tarsal joint not as long as the next 

 three. Length .30-.:52 inch ; 7.5-8 mm 



The two specimen;^ before me show no sexual difFerences, tliey are 

 probably females. 



This species resembles brevicoUls very closely in form and general 

 appearance, and the two differ especially in the different punctuation 

 of the thorax and elj^tra. 



Occurs in eastern Nevada ; two specimens. 



A. oclireipennis Horn. — Moderately elongate and convex, i)iceous nearly 

 black, lateral margin of head and thorax paler, elytra reddish yellow, legs brown. 

 Antennse paler. Head convex, without trace of any elevations, surface sparsely, 

 very finely punctulate; clypcus very broadly and feebly emarginate, broadly 

 rounded each side, the sides arcuate, gense moderately prominent, but obtuse. 

 Thorax nearly twice as wide as long, sides moderately arcuate, margin explanatc. 

 a rather deep depression near the hind angles, these very indistinct, base arcuate 

 at middle, obliquely sinuate each side, without trace of marginal line; di.sc con- 

 vex with numerous, but not densely placed fine punctures, and with very coarse 

 punctures near the base and sides, densely placed in the angular concavity. 

 Elytra narrower at base than the thorax, .slightly wider posteriorly, humeri very 

 obtuse, disc finely striate, strifie with very fine punctures, intervals nearly flat 

 and with numerous fine punctures. Body beneath coar.sely punctured at the 

 sides, abdomen more sjiarsely punctured. Mesosternum not carinate. Anterior 

 tibifB smooth in front, tridentate externally, but not crennlati" above. Posterior 

 femora sparsely punctate. Length .2fi inch ; 6.5 mm. 



One specimen, ])r()bably a female, without antoi-ior or posterior 

 tarsi has been seen. 



A very distinct species among those with exjilanate tliorax by the 

 very oblique sinuation of the base of the thorax near the hind 

 angles so that the angles are obliterated, and when the thorax is 

 viewed from above it seems to be narrower at base than ajiex. 'i'hc 

 color of the elytra is paler than the other species with a piccous body 

 color, but this is a character of seccmdary importance. 



One specimen, Owen's Valley, California. 



A. Haltloinaili (polHtix |] Horn). — (~)bl<)ng, moderately convex, rufo-tes- 

 taceous, .shining. Antennse pale. Head moderately convex, smooth shining, 

 without trace of frontal tubercles or punctures : cly])eus broadly but feebly euuir- 

 ginate, angles on each side broadly rounded, .sides slightly sinuate, tiie gena- 

 moderately prominent, but obtuse. Thorax transverse, .scarci'ly narrowed in 



TRANS. AMEK. KNT. .SOC. XIV. (Ty) KKIUU'AKV. 1(^87. 



