NORTH AMKUICAN COLEOPTERA. 31 



A. rudis Lee. — Moderately elongate and convex, dark chestnut brown, shin- 

 ing. Antennae pale brownish testaceous. Head sparsely punctate at the sides, 

 smoother at middle, front not tuberculate ; clypeus broadly but feebly eraargin- 

 ate with a dentiform angulation each side, sides arcuate, slightly smooth, with 

 short fimbriae, the gense prominent and subacute. Thorax twice as wide as long, 

 not narrowed in front, the sides very feebly arcuate, the margin explanate, hind 

 angles obtuse, base arcuate at middle, sinuate each side near the hind angles, 

 without trace of basal marginal line ; disc moderately convex, with extremely 

 fine and sparse punctures and with numerous large but shallow punctures over 

 the entire surface except in a transverse space one-fourth from ai)ex, and along 

 the median line. Elytra a little narrower at base than the thorax, slightly wider 

 behind, finely striate, strise with fine close punctures, intervals flat, very minutely 

 punctulate. Body beneath sparsely indistinctly punctate. Mesosternum not 

 carinate. Anterior tibiai tridentate and indistinctly crenulate above, the ante- 

 rior face smooth ; the first joint of tarsus shorter than the second. Posterior 

 femora sparsely punctate, the first joint of the tarsus as long as the next three. 

 Length .26 inch ; 6.5 mm. 



Tlie specimen before me is probably a female, it shows no sexual 

 characters. 



In the original description of this species Dr. LeConte was dispo.sed 

 to place the species with ovipennis and others in which the thorax is 

 distinctly narrowed i)osteriorly and the sides sinuate in front of the 

 hind angles. These two characters do not exist in the present spe- 

 cies, and the explanate sides of the thorax suggest its relationship. 

 The depression of the thorax near the hind angles so well marked 

 in most of the explanate species is not very evident here. 



Occurs in Colorado. 



A. pIiH'opterus Lee — Oblong, moderately convex, piceous, shining, sides 

 of head and thorax sometimes the elytra paler, legs brownish. Antennserufo-tes- 

 taceous, club somewhat darker. Head moderately convex, sjiarsely punctulate, 

 without frontal tubercles, but with a slight tulierosity each side ; clypeus convex 

 at middle, apex broadly but feebly emargiiiate, the angles each side distinct, but 

 not dentiform, sides oblique slightly arcuate, gense moderately prominent, but 

 obtuse. Thorax nearly twice as wide as long, the sides parallel posteriorly, arcuate 

 in front, margin narrowly explanate, more widely in front, without depression 

 near the hind angles, these distinct, but obtuse: base regularly arcuate, witli au 

 extremely feeble trace of a marginal line, disc convex with moderately coaree 

 punctures not densely placed along the sides and base, with finer punctures inter- 

 mixed and in the antero-median space. Elytra a little narrower at base than 

 the thorax, slightly wider posteriorly, humeri distinct, disc rather deeply striate, 

 stripe closely finely punctate, intervals convex finely punctulate. more distinctly 

 near the apex. Body beneath sjiarsely punctate. Jresosternum not carinate. 

 Anterior tibije smooth in front, tridentate externally and crenulate above, tlie 

 first joint of the tarsus much shorter than tlie second. Posterior femora sjjarsely 

 l)unctate. the first joint of the tarsus very nearly as long as the next tiiree. 

 Length .28 inch ; T nun. 



