44 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 66 



intermixed ; antennae feebly aeneous. Pronotum moderately convex, 

 not quite two times as wide as long, narrower in front than 

 behind, widest along basal half; sides feebly arcuate from base to 

 middle, then more arcuately attenuate to the anterior angles; 

 posterior angles obtusely angulated ; anterior margin feebly arcuately 

 emarginate, with a broadly rounded obsolete median lobe ; base trans- 

 versely truncate to middle of elytron, then with a broadly arcuately 

 rounded median lobe; surface rather broadly depressed along sides, 

 with a deep, broadly concave, transverse depression along base, 

 extending to the posterior angles, and becoming deeper and more 

 triangular at the sides, and with a short lateral carina, which does 

 not extend to the base, sparsely, rather coarsely, and irregularly 

 punctate, and the intervals densely and finely reticulate. Scutellum 

 triangular, and obsoletely reticulate. Elytra moderatly convex, 

 slightly narrower than pronotum at base; humeral angles obtusely 

 angulated; sides nearly parallel to just behind the middle (feebly 

 arcuately constricted at middle) , then arcuately attenuate to the tips, 

 which are separately narrowly rounded, with the lateral margins 

 obsoletely serrate posteriorly; humeri rather strongly developed; 

 each elytron with a rather broad, deep, transverse basal depression, 

 and a similar one along lateral margin, extending from humeral 

 angle to middle, and becoming broader posteriorly; surface finely, 

 sparsely and irregularly punctate, the punctures tending to form 

 rows on the disk, with the intervals smooth posteriorly, but be- 

 coming more or less rugose on the basal region. Abdomen beneath 

 densely, obsoletely reticulate, with a few obsolete punctures inter- 

 mixed, and sparsely clothed with very short inconspicuous hairs ; last 

 segment rather narrowly rounded at apex. Prosternum clothed with 

 a few long erect hairs, subopaque, and finely and very densely 

 granulose; prosternal process long, broad, sides parallel, and the 

 apex broadly rounded; anterior margin broadly arcuately rounded. 

 Metasternum deeply arcuately emarginate in front. 



Female. — Differs from the male in being more robust, scutellum 

 cupreous, lateral carinae on pronotum more distinct, last abdominal 

 segment more broadly rounded at apex, and the prosternal process 

 sparsely and coarsely punctate. 



Length, 3.5 mm.; width, 1.3-1.5 mm. 



Type locality. — Huachi (Beni Eiver), Bolivia. 



Other localities. — Rurrenabaque (Beni River), Bolivia. 



Type, allotype and pamty pes.— C-Ai. No. 26990, U.S.N.M. 



Described from six specimens, two males and four females. The 

 type, allotype and one female paratype collected at Huachi during 

 September, 1921, and one male and two female paratypes collected 

 at Rurrenabaque during October and November, 1921. 



