AMERICAN COMPONENTS OF THE TENTVRIIN-« 4O3 



half longer than wide, the sides feebly arcuate, stronpjly rounding 

 at base, at the middle two-thirds wider than tlie prothorax, the 

 impressed lines obsolete except suturally toward tip, where they 

 are strong as usual, the punctures fine, sparse, becoming slightly 

 coarse and closer but shallow, with the surface but little less 

 shining, laterally, having also some very feebly defined and 

 irregular disconnected lines of larger punctures suturally ; abdo- 

 men shining, with rather small but strong, somewhat close-set 

 punctures and with the surface feebly rugulose medially. Length 

 10.5 mm. ; width 5.3 mm. Arizona (Seligman), — H. F. WMck- 

 ham tenebrosus n. sp. 



Pronotal ridges ( O ) parallel and straight or virtually so. Body stout, 

 oblong-oval, convex, shining, black, the upper surface with a 

 feeble and more grayish lustre, the under surface feebly viridi- 

 aeneous ; pubescence extremely short and very inconspicuous ; 

 head elongate, only moderately coarsely but deeply, densely and 

 subevenly punctate, finely and sparsely in the more opaque area 

 before the transversely tumid occiput, theepistoma strongly ogival, 

 with the sides but slightly arcuate ; prothorax ( 9 ) not quite one- 

 half wider than long, trapezoidal, with the sides very feebly, 

 evenly arcuate from the rectangular and non-prominent basal 

 angles anteriorlv, becoming obviously sinuate behind the very 

 acute, prolonged and everted apical angles, the thickened margin 

 subequal throughout and minutely, densely punctate ; ridges 

 rather narrowly elevated, becoming broad and feeble posteriorly, 

 the surface alutaceous, finely, loosely punctate, rather coarsely 

 and somewhat closely laterally, with a very fine impunctate line 

 along the margin in apical half, and another, along the median 

 line and not attaining the apex, flat as in tencbros?(s and not at all 

 elevated ; elytra as in tenebj-osiis but more elongate, nearly smooth, 

 at the middle not more than one-half wider than the prothorax, 

 the impressed lines broad and subobsolete on the disk, the punc- 

 tures rather coarse, deep and close-set, becoming still coarser, 

 dense and subscabrous laterally ; abdomen as in tenebrosus. Male 

 w^ith the head and prothorax more coarsely but closely punctate, 

 the latter relatively rather small, with the anterior angles produced 

 and prominent. Length 10. 0-10.8 mm. ; width 4. 8-5. 3 mm. 

 Arizona (Tu9son) occipitalis n. sp. 



10 — Body narrowly oval in form, somewhat as in arundinis and 



cejieicoUis 11 



Body stout in form 14 



1 1 — Integuments black, with a dull bronze lustre 12 



Integuments without metallic lustre 13 



13 — Form moderately narrow, convex, moderately shining, with very 



short inconspicuous pubescence ; head somewhat longer than 

 wide, rather coarsely, very closely punctate, the epistoma broadly 

 and obtusely ogival; prothorax ((^) one-half wider than long. 



