48 PROCEEDINGS OF THE ACADEMY OF [Feb., 



Odynerus abdominalis n. sp. 



?. — Black; a narrow, medially interrupted line at base of 

 clypeus, spot at base of antenna and another at summit of cheeks, 

 line on scape, anterior and posterior margins of pronotum narrowly, 

 dot behind tegulse, line on postscutellum, line on middle segment 

 postero-laterally (sometimes absent), and apex of all abdominal 

 segments, yellow; legs dark brown, anterior tibiae yellow in front; 

 head deeply punctured; a distinct medial fovea behind ocelli; 

 clypeus longitudinally rugoso- punctate, a little longer than broad, 

 subi)yriform, subtruncate, a lateral carina terminates in a minute 

 tooth ; flagellum short ; thorax deeply punctured, mesopleurjB less 

 strongly; scutellum not impressed; postscutellum entire; middle 

 segment broadly concave, coarsely punctured above, finely rugose 

 in the concavity, postero-lateral angles prominent, a very slight 

 horizontal surface medially; first segment behind the fine sharp 

 carina broader than long, with tolerably strong punctures becoming 

 sparse anteriorly ; second segment strongly punctured apically, the 

 punctures becoming sparser and feebler toAvard base, between mid- 

 dle and apex there is a distinct transverse depression and the apical 

 margin is distinctly produced medially into a tooth ; ventral surface 

 depressed medially, transversely swollen near base, the punctures 

 similar to those of the dorsal moiety laterally; wing subfuscous, 

 paler apically, darkest along anterior margin ; nervures black, 

 stigma dark brown. Length 9-10 mm. 



Chapada (INIarch, December). Three specimens. 

 Odynerus (Stenancistrocerus) dentiformis n. sp. 



?. — Black, with silky pile, especially on the abdomen; arcuate 

 line on base of clypeus, spot at base of antennse, in the eye-emar- 

 gination, base of mandibles, and at summit of cheeks, scape ante- 

 riorly, anterior and posterior margins of pronotum, postscutellum 

 except apex, spot beneath tegulse and a small one behind them, two 

 semicircular spots on posterior surface of middle segment the two so 

 placed as to almost form a circle, a spot before apex of middle and 

 anterior femora, a line on all tibise, apical margin of abdominal 

 segments 1-5, rather broadly, and last dorsal segment entirely, 

 bright yellow ; tegula; reddish-brown, margined with yellow ; flagel- 

 lum not pale beneath ; legs <lark brown ; head with deep, separated 

 punctm-es ; a smooth fovea behind ocelli, the hind pair of the latter 

 each bordered internally by a tubercle; clypeus subpyriform, 



