CoJeopterological Notices, V. 57 1 



of the prosternum a little longer than wide, large, distinct, subtruncate ante- 

 riorly. Mesosternum triimpressed between the coxae, the oblique groove of 

 the metasternum fine and striiform. Anterior tibiae dilated and thinner exter- 

 nally toward apex. Length 1.25 mm. ; width 0.7 mm. 



Utah (southwestern). 



Readily distinguishable from the two following species by the 

 narrower form, finer sculpture, prosternal structure, and less un- 

 equally divided pronotum. A single specimen, recently taken by 

 Mr. C. J. Weidt. 



P» CribratllS. — Somewhat broadly oblong-oval, moderately convex, shin- 

 ing, black, the prothorax scarcely perceptibly picescent ; punctures extremely 

 minutely setigerous. Head strongly, closely punctate, the supra-antennal 

 prominences feeble. Prothorax nearly one-half wider than long, the sides 

 parallel and feebly sinuate to apical third, there broadly rounded to the 

 apex ; marginal stria strong and sinuate toward base ; inner marginal strong, 

 straight, flexed outward at base ; interspace broad and feebly convex ante- 

 riorly, strongly, densely punctate ; discal sulcus strong, the segments convex, 

 the anterior three-fourths as long as the posterior, both deeply, closely punc- 

 tate. Scutellum small, triangular. Elytra not quite as long as wide, rather 

 abruptly tumid at the sides behind the humeri and slightly wider than the 

 prothorax, about one-half longer, the oblique basal striae feeble ; punctures 

 rather coarse and very dense ; suture distinctly, acutely elevated ; inflexed 

 flanks deep but not modified, the lower margin broadly angulate. Pygidia 

 strongly, closely punctate, the propygidium less densely so. Under surface 

 coarsely, densely punctate, the punctures more or less longitudinally sub- 

 confluent. Hypomera deeply impressed internally, the subapical internal 

 emargination broadly rounded. Posterior lobe of the prosternum very small, 

 narrow, feebly punotulate, tuberculiform and compressed; median line of the 

 mesosternum feebly impressed. Length 1.4 mm. ; width 0.85 mm. 



Colorado. 



This distinct species may be known at once by its dense cribrate 

 sculpture and small posterior lobe of the prosternum, 



P. molestllS. — Rather broadly oblong-oval and convex, polished, dark 

 piceoiis-brown, the prothorax dark rufous ; legs and antennal club pale. 

 Head finely but strongly, moderately closely punctate, the antennal promi- 

 nences rather feel:)le. Prothorax about one-half wider than long, the sides 

 subparallel and feebly sinuate in basal two-thirds, then broadly arcuate and 

 convergent to the truncate apex ; inner lateral groove strong, the marginal 

 surface rather narrow, convex, strongly and closely punctate, becoming almost 

 obsolete at base between the widely expanded marginal and lateral grooves ; 

 discal sulcus very deep, the segments convex, the anterior rather more than 

 three-fourths as long as the posterior, finely but strongly, evenly and closely 

 punctate, the posterior rather sparsely and unevenly so, the punctures much 



