AMERICAN COMPONENTS OF THE TENTYRIIN^ 317 



thence to the humeral arcuation, the punctures fine, sparse and 

 irregular, with well marked, feebly impressed series of larger 

 close-set punctures, becoming rather coarse but irregularly crowded 

 toward the sides. Length 7-3-7.7 mm. ; width 3.2 mm. Arizona. 



histrica Csy. 



Form oblong, nearly as in Jiistrica but less elongate, similarly rather 

 shining, black, the legs dark rufous; head dull and nearly similar 

 but less transverse and more finely, rather sparsely punctate, the 

 sides equally converging but more strongly arcuate, the angles 

 more broadly rounded and much less evident, the epistoma feebly 

 sinuato-truncate ; prothorax more transverse, nearly four-fifths 

 wider than long, almost similar in form and punctuation, the 

 minute medial punctures rather less sparse; scutellum somewhat 

 less developed but similarly narrowed toward base and punctulate 

 in basal half; elytra one-half longer than wide, but little more 

 than three times as long as the prothorax and about a sixth wider, 

 the sides parallel and nearly straight, the humeri rounded and the 

 apex abruptly and very broadly rounded in posterior fourth, the 

 sculpture nearly as in histrica but with the stride feebly impressed 

 and the slightly elevated double series of small, widely spaced 

 subsutural asperities on the posterior declivity rather more pro- 

 nounced ; abdomen very finely rugulose, minutely and sparsely 

 punctate medially. Length 6.5 mm. ; width 3.9 mm. Arizona 

 (Tu9son) , — H ."^ F. Wickham obtusa n. sp. 



9 — Pronotal punctures usually fine, aciculate or muricate and very 



dense, the surface generally dull in lustre ; body oblong as a 



rule and moderately convex 10 



Pronotal punctures larger and more or less widely separated, with the 

 surface polished; body generally more oval and convex 20 



10 — Elytra alutaceous in lustre 11 



Elytra highly polished and rather more convex 19 



II — Elytral punctures fine, sparse, feeble and slightly muricate, the 



punctured series indistinct and only traceable near the base. 

 Body oblong, piceous-black, the under surface more rufous and 

 the legs still paler, alutaceous throughout above; head strongly, 

 densely and roughly punctured, the sides strongly converging 

 and nearly straight, rapidly rounding at the apical angles, the 

 epistoma broad, scarcely produced ; prothorax four-fifths ( 9 ) to 

 nearly twice ( J^) as wide as long, widest at the middle, the sides 

 subevenly and moderately arcuate, the apex sinuate and slightly 

 narrowed, the punctures very fine, moderately close-set, becoming 

 larger, rough and very dense toward the sides ; elytra two-fifths 

 to one-half longer than wide, just visibly ((j^) to a fifth or fourth 

 (9) wider than the prothorax, parallel and nearly straight at the 

 sides, narrowing slightly at the base, the apex obtusely rounded ; 

 abdomen shining, minutely, sparsely punctate medially, less 

 finely toward tlie sides. Length 5.0-5.3 mm.; width 2.2-2.3S 

 mm. Utah (St. George),— H. F. Wickham uteana n. sp. 



