60 PROCEEDINGS OF THE ACADEMY OF [Feb., 



costa aud in margiual cell, uervures and stigma brownish. Length 

 9 mm. 



Corumba (April). One specimen. 

 Odynerus striatus n. sp. 



?. — Black; a curved medially interrupted line on clypeus at 

 base, spot on mandibles near base, at insertion of antennae, dot in 

 eye-emargination, scape beneath, spot on cheeks near summit, on 

 lateral angles of pronotum, posterior margin of the latter obscurely, 

 dot behind tegulse, line on postscutellum, the borders of the con- 

 cavity of middle segment, and a line at apical margin of segments 

 1-5, yellow ; flagellum entirely dark, the pedicel testaceous beneath ; 

 tegulse brownish ; legs dark, somewhat brownish, the tarsi and fore 

 tibise lighter. Head deeply punctured ; front strongly convex, the 

 cheeks moi'e so than in allied species ; hind ocelli pitted, the head 

 behind them with a small rounded depression or pit ; clypeus pyri- 

 form, striated longitudinally, most coarsely apically, where, on each 

 side, is a carina which terminates in a blunt though well-developed 

 tooth at apex (the apex of clypeus between the teeth is depressed 

 or excavated) ; flagellum clavate; thorax with the punctures larger 

 than on the head, sparsest on mesopleurse; pronotum with a well- 

 developed crista toward sides which are dentate; scutellum not 

 impressed; middle segment with a fairly well-developed medial 

 surface above, where it is coarsely rugoso-punctate, the sides with 

 coarse punctures becoming shallower and sparser toward meta- 

 pleurse, concavity with shallow punctures, bordered with a rather 

 sharp ridge ; carina of first abdominal segment bordered posteriorly 

 by a series of fovese, which are in turn followed by a transverse 

 smooth area on each side, the remainder of the segment with fairly 

 strong punctures much less strong than on any part of thorax, 

 however ; the length of the first segment from the carina l)ack is 

 greater than half its width at apex ; segment 2 above similarly 

 punctured, but more coarsely at apex, which is slightly produced 

 in the middle, giving it an angular appearance, ventrally the seg- 

 ment is more sparsely punctured ; Avings subhyaline, quite dark 

 along costal margin, and in marginal cell; nervures and stigma 

 black. Length 9 mm. 



(^. — Colored much like the 9, but differing as follows: clypeus 

 entirely, and a median spot on pronotum, yellow ; fore tibiae testa- 

 ceous brown ; flagellum beneath brownish. Clypeus shorter, more 



