1902.] NATURAL SCIENCES OF PHILADELPHIA. 51 



distinctly aud closely punctured, more coarsely apically, not 

 refiexed, the ventral surface with larger, sparser punctures ; other 

 segments, as far as visible, distinctly punctured except the last; 

 wings subhyaline, clouded apically, in the marginal cell, aud less 

 strongly in the costal ; nervures and stigma black or dark brown. 

 Length 7^ mm. 



cf — Colored like 9 , with the yellow of clypeus more extended ; 

 occiput less depressed, aud no vertical brush ; clypeus shorter with 

 emargination deeper; eye-emargination not triangular; antennse 

 hooked, the last joint rather smaD, its length combined with that of 

 the preceding one not equaling the eleventh joint ; pronotum dentate ; 

 legs not unusually modified. Length 7 mm. 



Corumba and Pedra Branca in April. One ?, three males. 

 Odynerus (Stenanoistrocerus) atripes n. sp. 



9 . — Black, with sericeous pile ; sides of clypeus, sj^ot between 

 antennre, in the eye-emargination, scape beneath, line behind eyes, 

 posterior margin of pronotum, greater part of scutellum and post- 

 scutellum, dot beneath wings, a semicircidar spot on each side of 

 middle segment posteriorly, line at apex and sides of segment 1, 

 and apical margin of segment 2, dull yellow; flagellum fulvous 

 beneath; legs black, the fore tibise testaceous in front. Head 

 with deep, rather close but not confluent, pimctures; a rounded 

 fovea behind ocelli ; the latter not margined by tubercles ; clypeus 

 convex, low pyriform, bi'oader than long, with shallow separa- 

 ted pimctures, its fore margin with two rather widely separated 

 teeth ; thorax with strong, close punctures, those on mesopleurae finer 

 and sparser, and those of antero-lateral porton of middle segment 

 large and sparse, giving that portion of the segment a spongy 

 appearance ; scutellum impressed ; postscutellum subtriangular ; 

 middle segment at base with a short medial surface, but it is very 

 slight and depressed below the postscutellum ; concavity almost 

 smooth, bounded by a tolerably strong carina ; first segment with 

 shallow punctures, with the carina sharp and sinuous, the doi"sal 

 surface twice as broad as long, and with a faint, thougli distinct, 

 longitudinal furrow medially ; second segment with similar sparser 

 punctures, not reflexed, ventral surface with stronger punctures, 

 transversely prominent near base ; dorsals 3-5, closely antl strongly 

 punctured; wings subhyaline, a fuscous cloud in marginal cell, 

 nervures and stigma dark brown. Length 10-11 mm. 



