1902.] NATURAL SCIENCES OF PHILADELPHIA. 57 



basal spot ; the abdominal faseise heavier. The elypeus is longer, 

 more lozenge-shaped, not carinated, and the punctures very shallow, 

 in fact quite indistinct ; front not impressed ; hind ocelli margined 

 internally by a tubercle ; flagellum dull rufous beneath, the tenth 

 joint minute, the eleventh elongate, acute, the combined length of the 

 two not more than equaling that of the ninth joint ; the length of the 

 antennse is not quite as long as the head and thorax united ; medial 

 length of pronotum not as great as in female ; sculpture throughout 

 somewhat coarser ; the angulation of second dorsal more pro 

 nounced, almost dentiform. Length 8-9 mm. 



Chapada (September, December, January) ; Corumbii (April). 

 One female, eleven male specimens. 

 Odynerus cordatus n. sp. 



9. — Black; sides of elypeus, spot at base of antennre, in each 

 eye-emargiuation, at base of mandibles, scape beneath, short line 

 on cheeks near summit, rather broad line on pronotum anteriorly 

 and on scutellum posteriorly, spot on mesopleurse, tips of four ante- 

 rior femora broadly, most of fore tibiae and a line on medial ones, 

 the hind pair obscurely lined, and apical margin of segments 1-5 

 narrowly, yellow; flagellum beneath and tegulae fulvous brown, the 

 latter spotted basally with yellow. Head with large separated 

 punctures ; front slightly impressed ; no smooth area behind ocelli ; 

 ch'peus cordate, strongly punctured, not carinate, triangidarly emar- 

 ginate at apex ; flagellum clavate, rather short ; punctures of thorax 

 scarcely as deep and a little more separated than on front, those on 

 mesopleurse much more separated ; fore margin of pronotum cris- 

 tate its entire length, subdentate at sides ; medial length of prono- 

 tum not well developed ; upper surface of middle segment very well 

 developed medially, not emarginate, coarsely rugose, in length 

 almost equaling the scutellum ; concavity of middle segment appar- 

 ently not sculptured, the surrounding ridge rather even, and not so 

 broken as in many species of the genus; first abdominal' segment 

 closely though distinctly punctured on dorsal surface, which in 

 length is not equal to half its breadth, the carina distinct though 

 comparatively slender, and behind it there is a series of fove?e ; 

 second segment even more closely punctured, but more s])ariugly 

 toward apical margin, which is not reflexed ; ventral segments with 

 large, sparser punctures, the second at base with a series of very 

 large fovere ; wings subhyaline, with a fuscous cloud in marginal 



