ART. 31 BUPRESTID BEETLES FROM BOLIVIA FISHEE 31 



PACHYSCHELUS VIRIDESCENS (Kirsch) 

 Brachys viridescens Kirsch, Berl. Ent. Zeit., vol. 17, 1873, pp. 359-360. 



A single example of this species was collected near the mouth of 

 the Mapiri River, Bolivia, during September, 1921. 



PACHYSCHELUS NUDUS, new species 



Male. — More narrowly cuneiform than cavina^, considerably 

 longer than wide, broadly rounded in front, strongly attenuate 

 posteriorly, distinctly narrower behind than in front, and the sur- 

 face glabrous and moderately shining; head and pronotum aureo- 

 viridis, the latter with a large, broadly triangular fuscous spot, 

 the sides of the spot extending from anterior margin at middle, 

 obliquely backward to the posterior angles; scutellum fuscous: 

 elytra greenish-black ; beneath piceous, and more shining than above. 

 Head feebly convex, deeply embedded in the prothorax, broadly 

 but not deeply depressed on the front, and with a narrow obsolete 

 longitudinal groove, extending from vertex to near the epistoma, 

 Avhere it terminates in a small obsolete triangular depression; sur- 

 face densely and coarsely granulose, with a few coarse, irregularly 

 placed punctures intermixed. Pronotum feebly convex, three times 

 as wide as long at middle, much narrower in front than behind, 

 and widest at base; sides strongly obliquely arcuate from base to 

 anterior angles, which are acutely angulated; anterior margin 

 broadly and deeply arcuately emarginate; base transversely sin- 

 uate, acutely emarginate at elytral lobes, and feebly broadly 

 emarginate in front of scutellum; posterior angles acute, projecting 

 slightly beyond the humeral angles of elytra and fitting closely to 

 them; surface glabrous, sparsely and irregularly punctate, the 

 punctures rather fine and more obsolete on the disk, becoming 

 coarser at the sides, the intervals nearly smooth on the median part, 

 but densely, finely granulose toward the lateral margins. Scutellum 

 wider than long, glabrous, obsoletely granulose, with the anterior 

 angles rectangular. Elytra about as wide as pronotum at base; 

 humeral angles broadly rounded; sides nearly parallel to near the 

 middle, then obliquely attenuate to near the tips, which are con- 

 jointly rather narrowly rounded, the lateral margins strongly ser- 

 rate posteriorly, and when viewed from the side, are feebly sinuate, 

 and with a more distinct sinuation for the posterior femora; each 

 elytron with a broad obsolete basal depression, and with a very 

 broad, deeper depression behind the humerus, broadly flattened 

 along lateral margin and extending forward to the humeral angle; 

 surface coarsely, obsoletely and irregularly punctate, and the inter- 

 vals more or less obsoletely rugose. Abdomen beneath moderately 



