64 PROCEEDINGS OF THE ACADEMY OF [Feb., 



of clypeus, reddish; uarrow Hue, broadly iuterrupted medially, on 

 fore and hind margins of pronotum, spot on mandibles basally, on 

 tegulse anteriorly, narrower line on postscutellum, a narrow line on 

 each side of the vertical face of middle segment, small spot at tips 

 of femora, line on fore tibiae anteriorly, a broad fascia (brighter in 

 color) on apical margins of segments 2-5, and the apical segment 

 entirely, yellow. Head strongly punctured, most closely on front; 

 clypeus about as long as broad, cordate, striato-punctate, medially 

 with two widely separated tubercles, at apex bidentate, or triangu- 

 larly emarginate ; pronotum with strong, deep, punctures, sharply 

 margined anteriorly, the lateral angles obtuse, not dentate ; punc- 

 tures of dorsulum and scutellum less strong, the latter subquadrate, 

 large, convex; postscutellum entire; middle segment, with the 

 dorso-lateral surfaces with very large, though rather shallow, punc- 

 tures, the posterior depressed surface transversely striate, bordered 

 above on each side by a sharp ridge which terminates in a small 

 tooth on the lateral augles; the apical portions of the segments 

 strongly punctured except the second ventral, which is punctured 

 throughout; wings fusco-hyaliue, brown in costal cell, nervures 

 brownish. Length 13 mm. 



Corumba (April). One specimen. 

 Odynerus (Odynerus) chapadse n. sp. 



9. — Black ; with sericeous pale brownish pile, especially on abdo- 

 men, the pubescence of front black; mandibles reddish apically; 

 spot on inner orbit near cl}TDeus, on mandibles basally, the posterior 

 margin of pronotiun, line on postscutellum, and one on apical 

 margin of segments 1-6, yellow; that on segment 1 narrowest; 

 tegulie black at base, with a brown medial spot, and margined 

 externally with yellow ; the tips of femora obscurely yellow. Head 

 strongly punctured, more closely on front ; clypeus about as long 

 as broad, striato-punctate (except basally, where there are separated 

 punctures), with two rather strong, widely separated, polished 

 tubercles, the apex with two rather widely separated teeth, there 

 being but a feeble emargination between them ; thorax above with 

 large separated punctures, those on dorsulum anteriorly closest; 

 pronotum sharply margined anteriorly, not dentate ; scutellum Avith 

 a longitudinal medial raised line; postscutellum with a serrated 

 crista; middle segment with the dorsal surfaces rugoso-punctate, 

 sides with large shallow punctures, the concave surface more finely 



