AMERICAN COMPONENTS OF THE TENTYRIIN^ 319 



slightly alutaceous, dark castaneoiis, the head, prothorax, under 

 surface and legs more or less pale rufous ; head strongly, evenly and 

 rather closely punctate, the sides converging and but feebly arcu- 

 ate; prothoi'ax nearly four-fifths wider than long, distinctly 

 narrow^er at apex and deeply sinuate, the sides evenly and strongly 

 arcuate, the punctures fine but deep and moderately close-set 

 medially, becoming moderately coarse, dense and scabrous later- 

 ally ; elytra two-fifths longer than wide, a fourth or fifth ( 9 ) 

 wider than the prothorax, obtusely rounded at tip, the sides 

 decidedly arcuate ; abdomen finely and sparsely punctate medially, 

 the last segment more closely as usual, the sides somewhat 

 coarsely though just as sparsely. Length 5.6 mm. ; width 2.5 

 mm. Texas (El Paso) mimetica n. sp. 



Elytral series not or scarcely impressed, less even or relatively less 

 strongly punctured as a rule 14 



14 — Species of southern California and western Arizona 15 



Species of eastern Arizona to western Texas 16 



15 — Form oblong, brown in color, the legs rufous; surface rather 



dull in lustre; head paler at the sides and apex, strongly and 

 densely, subscabrously punctate, the sides strongly converging 

 and feebly arcuate, the eyes moderate, rather prominent; pro- 

 thorax not quite twice as wide as long, slightly narrowed and 

 broadly sinuate at apex, widest at the middle, the sides evenly 

 and strongly arcuate, the punctures small but muricate and close- 

 set medially, becoming coarser, dense and scabrous laterally, the 

 interstices opaque; elytra one-half longer than wide, a fifth 

 wider than the prothorax, obtusely rounded at apex, the sides 

 broadly, feebly arcuate, the punctures rather large but shallow 

 and muricate, somewhat close-set and uneven, sometimes forming 

 single series on the intervals toward base, the principal series 

 rather uneven, composed of punctures but little larger than the 

 interstitial but very close-set, the surface with broad, very obsolete 

 longitudinal impressed lines. Length 5.7 mm. ; width 2.42 mm. 

 California (Inyo Co.) , sodalis Horn 



Form oblong, piceous-black, the legs paler, piceo-rufous, the surface 

 sti'ongly alutaceous; head densely, moderately coarsely punctato- 

 scabrous, the sides strongly converging and nearly straight, the 

 eyes moderate ; prothorax not quite twice as wide as long, evi- 

 dently narrowed and deeply sinuate at apex, widest at the middle, 

 with the sides evenly and strongly arcuate, the punctures very 

 small, subelongated and close-set medially, becoming not very 

 coarse, but dense, scabrous and somewhat obliquely substrigose 

 laterally; elytra fully one-half longer than wide, rather more than 

 three times as long as the prothorax and nearly a fourth wider, 

 very obtusely parabolic at tip, the sides parallel, nearly straight, 

 feebly rounding basally, the humeri feebly exposed at base; 

 punctures rather small, shallow, submuricate, rather close-set 

 and uneven, with irregular series of similar thougli somewhat 



