AMERICAN COMPONENTS OF THE TENTYRIIN^ 393 



the punctures rather fine and well separated but strong, becoming 

 dense and rather coarse laterally, confused, with scarcely any 

 evidence of series, the sutural angles simple but very acute ; 

 abdomen smooth, finely, moderately closely punctured medially. 

 Length 10.5 mm. ; width 4.75 mm. Arizona... aequipenne n. sp. 



Body moderately obese and shining, colored like the preceding, the 

 tibiae slightly rufescent, the punctures bearing similar very minute 

 and inconspicuous hairs ; head rather coarsely, closely punctate, 

 subconfluently so laterally, more finely toward apex ; prothorax 

 fully a fifth wider than long, the apex but little more than two- 

 thirds as wide as the base, the sides feebly arcuate, becoming 

 broadly sinuate toward the apical angles, which are not greatly 

 deflexed, very acute and anteriorly produced, the basal angles 

 right and not prominent ; punctures coarse and deep, separated 

 by about one-half more than their own diameters medially, be- 

 coming very coarse and longitudinally subconfluent laterally, finer 

 and dense near the edges ; scutellum large, flat, impunctate, 

 angulate behind ; elytra rather rapidly and arcuately narrowed to 

 the acute tip, the sides broadly, evenly arcuate to the obtuse 

 humeri, which are evidently exposed at base, the surface with 

 broadly and feebly impressed lines almost throughout the width, 

 strongly, not very finely and rather closely punctured, densely 

 and rather coarsely toward the sides, the punctures confused but 

 becoming rather coarser and broadly aggregated in the impressed 

 lines, although not very evidently so ; abdomen smooth, not very 

 finely, strongly, rather sparsely punctured medially. Male nar- 

 rower, blacker and more sparsely punctured than the female, to 

 which the description refers. Length lo.o-ii.o mm.; width 

 4. 3-4. 8 mm. Arizona (near the southern boundary and San 

 13ernardino Ranch, Cochise Co.), — Morrison and Snow. 



morrisoni n. sp. 



13 — Form rather stout, oval, moderately convex, polished, glabrous, 

 black with strong cupreous lustre, the antennas nearly black, the 

 legs dark piceo-rufous ; head densely, deeply and rather coarsely 

 punctate, the basal excavations very deep and cavernous, the epi- 

 stoma broadly, obtusely angulate ; prothorax nearly one-half wider 

 than long, the apex rather more than two-thirds as wide as the 

 base, with the angles rather deflexed, acute and produced ante- 

 riorly, the sides broadly arcuate, becoming more converging and 

 broadly sinuate anteriorly and straight or just visibly sinuate near 

 the basal angles, which are acute and slightly prominent ; punc- 

 tures dense but not crowded toward the sides and apex, coarse 

 toward the former, fine toward the apex, more scattered toward the 

 middle posteriorly and with a partial flat impunctate line ; scutel- 

 lum ogival, about as wide as long; elytra gradually acutely pointed 

 behind in apical two-fifths and gradually declivous on the disk, 

 the sides feebly arcuate, more strongly rounded at t)ase to the 

 thoracic angles, the punctures confused, rather fine but strong, 



Proc. Wash. Acad. Sci., September, 1907. 



