46 PROCEEDINGS OF THE ACADEMY OF [Feb., 



depressed medially, the depression extending from base to apex, 

 not margined, no horizontal surface medially, the postero-lateral 

 region convex ; first dorsal segment deeply punctured on its hori- 

 zontal siurface, which is rather long, the carina, when viewed from 

 the front, highly arched ; second dorsal less strongly and closely 

 punctured, shallowly so beneath, the apical margin slightly reflexed, 

 the ventral surface is slightly swollen transversely, but not much, 

 near base ; the third and fourth segments are punctured on apical 

 half only, and much more finely ; apical segment smooth. Length 

 8-9 mm. 



c?. — Differs chiefly in the pale yellow clypeus, mandibles, spot 

 between antennae and eye-emargination ; the reddish base of flagel- 

 lum and much more swollen base of second ventral segment ; hind 

 tibiae suddenly enlarged wuthin at apex; first hind tarsal joint 

 having a twisted and sinuous shape ; antennae hooked, the terminal 

 joint curved, about as long as the eleventh joint, which in turn is 

 about one-fifth longer than the tenth ; clypeus narrower ; four hind 

 legs partly brownish. Length 8-9 mm. 



Corumba (April). Two ?, seven d" specimens. Apparently 

 related to 0. Fariasi and 0. incommodus. 

 Odynerus (Stenanoistrocerus) suffusus n. sp. 



cf. — Black; clypeus, spot on mandibles, scape in front, line 

 between antennae, and eye-emargination pale yellow ; spot on cheeks 

 above, hind margin of pronotum, dot behind tegulae, and apical 

 margin of segments 1-6, bright yellow; that on segments 2-6 quite 

 broad, in fact segments 3-6 appear entirely yellow above ; apical 

 segment brownish; pronotum anteriorly, spot beneath wing, post- 

 scutellum and on middle segment postero-laterally, rufous and 

 yellow ; tegulae brown ; sides of abdominal segments 1 and 2 more 

 or less suffused with rufous ; legs reddish, anterior coxae and most 

 of hind femora black, the remaining coxae yellow anteriorly, as well 

 as a stripe on the fore and medial femora and a spot on hind pair 

 at apex ; flagellum reddish beneath ; head with strong deep punc- 

 tures ; front presenting two convex surfaces ; each hind ocelli mar- 

 gined internally by a tubercle ; no fovea behind them ; clypeus 

 lozenge-shaped, longer tlian broad, roundly emarginate; antennae 

 hooked, the terminal joint flattened and strongly curved, barely as 

 long as the eleventh joint, which in turn is fully one-third longer 

 than the tenth joint; thorax deeply punctured, most closely so on 



