54 PROCEEDINGS OF THE ACADEMY OF [Feb., 



reddish -testaceous ; four hiud tarsi black. Head with deep, separ- 

 ated, puuctui'es; front strougly'eouvex ; clypeus convex basally, 

 flattened apically, elongate pyriform, with large, sparse punctures, 

 and apically with a carina on each side terminating in a small tooth 

 on apical margin, which is triangularly _emai"ginate ; a smooth fovea 

 or area behind ocelli, the latter not margined by tubercles ; thorax 

 with deep, separated punctures especially on dorsulum and scutel. 

 lum, the latter impressed apically; pronotum sharjjly cristate, 

 obtusely dentate laterally ; punctures of mesopleurse not so coarse, 

 and more scattered ; middle segment with a distinct medial surface 

 above, which is rugose, sides punctured like the mesoplem-se, con- 

 cavity bounded by a ridge, broad, with large shaDow punctures, the 

 postero -lateral angles prominent, obtusely dentiform ; abdomen with 

 large separated punctures, not so coarse however as those of 

 thorax ; first segment smooth anteriorly, the carina rather sharp, 

 angular medially when viewed from front, the segment behind it 

 broader than long ; second dorsal with its apical margin reflexed ; 

 wings subhyaline, darker in marginal cell. Length 9 mm. 



cf . — Clypeus entirely yellow, somewhat hexagonal, with two sharp 

 rather ap2:)roximate teeth apically ; hind ocelli margined mth a 

 tubei'cle internally ; antennae longer than head and thorax, flagel- 

 lum fulvous beneath, the eleventh joint concave beneath apically 

 and broad, twelfth joint small, much more so than the eleventh, the 

 following joint narrow basally, widened at apex, and rather flat, 

 terminal joint small, obtuse at tip, not half the length of pi'eceding 

 one ; scutelkim impressed its entire length ; hind tibiae slender, but 

 widened suddenly at apex; second ventral segment transversely 

 depressed at base. Length 7-9 mm. 



Chapada (December, Januaiy, May) ; Corumba (April). 



The d' antennae in this species ai-e in reality 14-jointed, which 

 is also the case in 0. advena. This character seems to be the best 

 for defining the division Hypancistrocerus, the horizontally pro- 

 duced superior face of middle segment being of less value, inas- 

 much as it is found in all degrees of development in various species. 

 Some species with 13-jointed d^ antennae possess it. 

 Odynerns coxalis n. sp. 



?. — Black; thorax and abdomen with sericeous grayish pile; 

 two spots on clypeus basally, one between insertion of antennae, in 

 each eye-emargination, on mandibles near base, line on scape 



