AET. 31 BUPBESTID BEETLES FROM BOLIVIA FISHER 33 



with very short inconspicuous hairs, nearly smooth on the disk, but 

 becoming finely and densely granulose, with a few coarse, shallow 

 punctures intermixed toward the sides. Scutellum wider than long, 

 glabrous, nearly smooth, with the anterior angles rectangular. 

 Elytra about as wide as pronotum at base; humeral angles broadly 

 rounded; sides parallel to near middle, then strongly obliquely at- 

 tenuate to near the tips, which are conjointly rather narrowly round- 

 ed, the lateral margins strongly serrate posteriorly, and when viewed 

 from the sides are feebly arcuate, with a feeble sinuation for the pos- 

 terior femora; each elytron with a broad, obsolete basal depression, 

 and with a broad, deeper one behind the humerus, broadly flattened 

 along the lateral margin, and extending forward to the humeral an- 

 gle; surface rather densely, coarsely and obsoletely punctate, the 

 punctures arranged in rows and from each puncture arises a very 

 short, recumbent, inconspicuous hair; intervals obsoletely rugose. 

 Abdomen beneath moderately convex, densely, finely and obsoletely 

 reticulate, and nearly glabrous ; last segment strongly, narrowly pro- 

 duced, and armed at apex with eight, moderately long, sharp teeth, 

 which are arcuately arranged, equally separated, and the median ones 

 not more widely separated than the lateral ones, the ventral surface 

 with a moderately deep, longitudinal depression, extending from 

 the apex to near the middle, and a similar one on each side along the 

 lateral margins. Elytral epipleura narrow. Metasternum sparsely, 

 coarsely punctate, and feebly, broadly, rectangularly emarginate in 

 front. Prosternum feebly arcuately emarginate in front, the surface 

 nearly glabrous, smooth, and obsoletely reticulate; prosternal pro- 

 cess nearly four times as wide as the coxal cavities, sides feebly 

 rounded, and broadly truncate at apex. 



Length, 2,5 mm.; width, 1.6 mm. 



Type locality. — Cavinas (Beni River), Bolivia. 



Type.—Q^X. No. 26982, U.S.N.M. 



Described from a unique female collected at the type locality 

 during January, 1922. 



PACHYSCHELUS BENIENSIS. new species 



Male. — Ovate, distinctlj^ longer than wide, broadly rounded in 

 front, more attenuate posteriorly, slightly narrower behind than in 

 front, and the surface nearly glabrous and moderately shining; 

 above bluish-black, with a more or less purplish tinge, the head and 

 sides of pronotum with an aeneo-viridis reflection, and the sides of 

 elytra more violaceous ; beneath piceous. 



Head feebly and evenly convex, deeply embedded in the pro- 

 thorax, and without a distinct longitudinal groove or anj'' depres- 

 sions on the front; surface glabrous, densely and finely granulose, 

 with a few coarse, irregularly placed punctures intermixed. Pro- 



