NORTH AMERICAN COLEOPTERA. 45 



A. deiitiger Lee. — Modorately cloiifjato, broader jxjsteriorly, piceous, shin- 

 ing. Antemiip piceous, club ferruginous. Head moderately convex, coarsely 

 sparsely punctate, slightly rugose laterally, front not tubei'culate ; clypeus de- 

 flexed at middle, the margin truncate, an elevated angulated line close to the 

 margin, on each side a small acute tooth, the sides strongly arcuate, with short 

 fiml)ri?e, gente moderately prominent, but very obtuse. Thorax twice as wide as 

 long, slightly narrower in front, the sides feebly arcuate, hind angles broadly 

 rounded, base regularly arcuate with submarginal line ; disc moderately convex, 

 coarsely not closely punctate, except at the angles, a distinct, smooth, median 

 line posteriorly. Elytra as wide at base as the thorax, humeri distinct, slightly 

 dentiform, sides arcuate, disc finely striate, punctures elongate, but not close, in- 

 tervals flat, irregularly biseriately punctulate. Body beneath paler in color, 

 sjiarsely indistinctly punctate. Mesosternum opaque, not carinate. Anterior 

 tibiae smooth in front, strongly tridentate externally and crenate above, the first 

 tarsal joint shorter than the second. Posterior coxse sparsely coarsely punctate, 

 the first tarsal joint as long as the next three. Length .24-. 26 inch ; 6-6.5 mm. 



3Iale. — Anterior tibial spur arcuate, the tip suddenly bent. Upper spur of 

 middle tibia short, obtuse, emarginate at tip. 



Female. — Anterior tibial spur more slender, not flexed at tip. Middle tibial 

 spurs acute. 



In the unique female the clypeal teeth are not prominent and acute, 

 possibly by abrasion, and as this may lead to the suggestion that the 

 species may belong to the following category, it may be observed that 

 the elevated angulate line immediately behind the iniddle of the 

 clypeal margin is quite characteristic. 



Occurs in southwestern Texas, also in Arizona. 



.4. coloradeusis Horn. — Oblong, a little broader posteriorly, piceous, shin- 

 ing. Antenna? rufotestaceous. Head piceous, margins brownish, moderately 

 convex, front not tuberculate, sparsely punctate, clyi>eus broadly emarginate, on 

 each side angulate, the sides arcuate, gente moderately prominent, subacute. 

 Thorax slightly narrowed anteriorly, sides feebly arcuate, hind angles di-stinct, 

 but obtuse ; base arcuate, on each side olilique near the hind angles, marginal 

 line fine, hut distinct ; disc moderately convex, coarsely .sparsely punctured with 

 a few fine punctures intermixed. Elytra as wide at base as the thorax, luuneri 

 obtuse, sides feebly arcuate, disc moderately deeply striate, stria^ indistinctly 

 punctured, intervals slightly convex, .sparsely punctulate. Body beneath sparsely 

 indistinctly punctate. Meso.sternum sparsely punctate, not carinate. Anterior 

 til)ice smooth in front, tridentate externally and distinctly crenate above, the 

 first tarsal joint shorter than the second. Po.sterior femora with a line of coarse 

 l>unctures posteriorly, the first tarsal joint a little longer than the next two. 

 Length .26-.30 inch; 6.5-7.5 mm. 



i¥«7e.— Spur of anterior tibia stout and strongly arcuate, ui)i)er spur of middU- 

 tibia slightly hooked at tip. 



Fema/e.— Spurs slender and acute. 



The angulation of the clypeus is strongly marked iu some speci- 

 men.-;, and even reHexed, forming a tooth. This .■species and ilei>fl(j>'r 



