1 68 MEMOIRS ON THE COLEOPTERA 



broadly rounded and the suture more deeply impressed; prothorax 

 rather more transverse and more anteriorly narrowed from some- 

 what behind the middle, the punctures broadly obsolete medially 

 and anteriorly throughout the width, distinct latero-basally 

 but not near the sides; elytra nearly similar and with polished 

 surface and obsolete punctures but still more obtuse at apex; 

 pygidium similar, but with the sparse punctures everywhere 

 notably coarse and conspicuous, though sparse and very fhallowly 

 impressed. Length (9) 16.0 mm.; width 8.5 mm. Arizona 



(Tucson). A single example *gilanus n. subsp. 



Prothorax parallel, with very feebly arcuate sides, which become 

 more rapidly arcuate and converging well before the middle. Color 

 black, the legs dark piceo-rufous; lustre highly polished; head much 

 more than half as wide as the prothorax, with shallow, moderate, 

 very sparse punctures; clypeus transverse and strongly trapezoidal, 

 the oblique sides barely at all arcuate, the obtuse angles distinct, not 

 more than blunt; apex deeply sinuato-truncate, the oblique lower 

 frontal part densely and finely punctate; edges sharply and equally 

 reflexed; surface sloping toward the sides, the sparse ruguliform 

 lines studded with minute projections; suture not clearly defined 

 except at the sides; antennal club small; mentum smooth, convex 

 anteriorly; prothorax only about three-fifths wider than long, convex, 

 the punctures everywhere remote, minute, a little stronger toward 

 the sides; scutellum with some very minute punctulation, broadly 

 smooth peripherally; elytra ( 9 ) about a fourth longer than wide, less 

 than two and one-half times as long as the prothorax, broadly, 

 circularly rounded at apex, a fourth wider than the prothorax, the 

 broadly arcuate sides a little more prominent just behind the middle, 

 the lateral bead thick, thin posteriorly and wholly obsolete around 

 the apex ; punctures small, deep, simple, sparse, with four double series 

 separated by nearly flat surfaces, the outermost series feeble, the 

 punctures of the second and fifth interspaces broadly confused, 

 those of the third and fourth in very irregular double series; pygidium 

 with deep rounded and not very coarse, rather sparse and evenly 

 distributed punctures; abdominal series lateral and rather confused. 

 Length (9 ) 18.5 mm.; width 9.5 mm. Brazil (Rio Grande do Sul), 



*obsidianus n. sp. 



Prothorax slightly narrowed from base to apex and with evenly and dis- 

 tinctly rounded sides throughout 8 



8 Body (cf) oblong in form, convex, shining, deep black, the legs and 

 under surface barely visibly paler; head somewhat more than half as 

 wide as the prothorax, with rather distinct but feebly impressed 

 punctures, smooth at base; clypeus nearly as in the preceding, the 

 edges sharply reflexed except near the base, the apex sinuato- 

 truncate, the angles moderately rounded, the interlacing and rather 

 sparse wavy rugulosity simple; prothorax nearly three-fourths wider 

 than long, the sparse punctures everywhere distinct; scutellum 

 smooth, obtusely ogival; elytra parallel, with evenly and very moder- 

 ately arcuate sides, distinctly longer than wide, abruptly very obtuse 

 at apex and only a little wider than the prothorax, widest at the 



