TENEBRIONID/E 159 



though narrowly deplanate, more coarsely punctate and rugose, 

 the edge evenly, rather strongly arcuate throughout, thickened and 

 elevated; apex deeply, evenly sinuate and distinctly narrower than 

 the base, the angles acute, not at all everted; base sinuate near the 

 basal angles, which are obtuse but distinct and posteriorly minutely 

 subprominent; elytra one-half longer than wide, widest at three- 

 fifths, the apical lobe moderate and distinct; sides arcuate, un- 

 margined except feebly at the basal angles, which are rather acutely 

 prominent; surface convex laterally, broadly impressed suturally, 

 with the feeblest traces of the vestigial riblets, smooth to subrugosely 

 creased, the minute punctures scarcely visible except sometimes 

 on the flanks; abdomen very minutely chagrined, minutely, sparsely 

 punctulate, more distinctly toward apex; legs only moderate in 

 length and very slender. Length (cf, 9) 20.0-23.0 mm.; width 

 io.o-n.8 mm. Arizona (regions near Nogales) vigens n. sp. 



4 Body, and especially the prothorax, strongly, evenly convex, black, 

 the elytra dark piceo-rufous, very shining throughout; head shining, 

 moderately and sparsely punctate, feebly tri-i m pressed ; antennae 

 rather slender; prothorax fully two-thirds as wide as the elytra (9 ) 

 or three-fourths (cf ), two-fifths wider than long, the apex narrower 

 than the base, deeply and evenly sinuate, the angles acute but not at 

 all everted, the basal angles very obtuse but distinct, the sides of 

 the base broadly, feebly sinuate; surface strongly declivous and sub- 

 impressed medially at base, very minutely, sparsely punctulate, 

 the sides abruptly but narrowly deplanate, strongly but sparsely 

 punctate and less shining, the edge evenly and moderately arcuate, 

 smooth and strongly, abruptly and narrowly elevated ; elytra two- 

 thirds longer than wide, moderately dilated posteriorly, more parallel 

 and with straighter sides in the male, widest at three-fifths, shining, 

 strongly, subevenly convex throughout or subimpressed suturally, 

 each with two feeble threads, the inner alone distinct, very unevenly 

 and sparsely creased and with small sparse uneven punctures sutu- 

 rally; humeral carina very short but elevated, the sides rounding 

 to the basal angles; abdomen shining, very smooth, duller and finely 

 punctate posteriorly; legs rather short, very slender. Length (cf , 

 9) 18.0-20.0 mm.; width 8.4-10.4 mm. Colorado and Western 

 Kansas convexus Lee. 



Body rather strongly convex, the elytra almost evenly so transversely, 

 piceous-black, the elytra brownish-rufous, rather dull in lustre 

 throughout and narrower and more cylindric than in any other of 

 this group; head very feebly impressed transversely, the punctures 

 deep, rather coarse and close-set anteriorly, gradually finer and sparse 

 posteriorly, the antenna? well developed, somewhat slender; prothorax 

 three-fourths as wide as the elytra, nearly as in the preceding but 

 opaque and widest and more strongly rounded at the sides slightly 

 behind the middle, the minute sparse punctures not so small and 

 deeper, the sides less narrowly explanate, the margins narrowly and 

 strongly elevated and punctate; middle of the base rather acutely, 

 longitudinally impressed; elytra moderately obovoidal, fully three- 



