32 GEO. H. HORN, M. D. 



iHaZe.— Upper spur of middle tibia short, stout, abruptly bent at apex. Middle 

 and posterior femora more punctate along the posterior edge and slightly hairy. 

 Female. — Upper spur slender. Femora not pilose. 



This species has been compared by Dr. LeConte with cruentatus, 

 with Avhich it seems to have much less in common than with ma?-- 

 ginatus. The latter is more dilated posteriorly, the thorax more 

 widely margined with a distinct concavity in the hind angles of the 

 thorax. In phceopterus the angles on each side of the emargination 

 of the gense are well marked, while in marginatus they are broadly 

 rounded. 



Occurs in Washington Territory, Idaho and Montana. 



A. brevicollis Lee. — Oblong, moderately elongate and convex, piceous, 

 shining, legs brownish testaceous. Antennse rufo-testaceous. Head piceous, the 

 margin reddish brown, surface punctulate, sparsely at middle, more coarsely near 

 the sides, front with a slight tuberosity each side: clypeus broadly emarginate, 

 the angles on each side rounded, sides arcuate, feebly sinuate, genfe prominent, 

 but obtuse. Thorax more than twice as wide as long, slightly narrowed in front, 

 the sides slightly undulating, the lateral margin rather widely explanate and 

 broader posteriorly, a distinct concavity near the hind angles, these very obtuse, 

 base feebly arcuate without marginal line; disc moderately convex, piceous, the 

 margins paler, surface smooth with very large punctures placed distantly near 

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

 humeri obtuse, surface rather deeply striate, strife closely not coarsely punctui'ed, 

 intervals slightly convex, smooth. Body beneath sparsely and indistinctly punc- 

 tate. Mesosternum not carinate. Anterior tibite strongly tridentate, not crenate 

 above, anterior face smooth, the tarsus with first joint shorter than the second. 

 Posterior femora smooth, the first joint of tarsus not as long as the next three. 

 Length .32 inch ; 8 mm. 



The unique before me, which is the type, shows no special sexual 

 characters. 



The characters given in the table will readily distinguish it from 

 the species at present known. 



Occurs in Nebraska ; one specimen kindly given me by Mr. H. 

 Ulke. 



A. marginatum Lee. — Moderately elongate and convex, somewhat broader 

 posteriorly, black or piceous, elj'tra and legs very dark brown. Antenna? pale 

 brown. Head moderately convex, front without tubercles, but with a slight 

 tuberosity each side, surface punctulate with somewhat coarser punctures near 

 the side ; clypeus very feebly and broadly emarginate, the angles very obtuse, 

 the sides oblique, gense moderately prominent, but obtuse. Thorax more than 

 twice as wide as long, a little narrower in front, sides very feebly arcuate, the 

 margin rather broadly explanate with a well marked depression near the hind 

 angles, these very obtuse, base feebly arcuate without marginal line ; disc mod- 

 erately convex, with numerous but not closely placed fine jiunctures and with 

 very many large punctures which are closely placed near the hind angles and 



