408 PROCEEDINGS OF THE ACADEMY OF [1899. 



emargination of eye is pushed out, distorting the eye, so that when 

 viewed from the side it appears to be sharply angulate, or subdeu- 

 tate on its inner margin, 



Zethus prominens n. sp. 



Black, shining; middle segment, petiole, base of second seg- 

 ment, legs, clypeus except base, mandibles and scape beneath, red ; 

 apex of petiole with a yellow line on each side, extending a little 

 along sides; wings viol aceovis. 



?. — Clypeus about one-third broader than long, obtusely angu- 

 lar at sides, with shallow punctures, fore margin broadly incurved, 

 obtusely dentate medially; mandibles long, equalling the width of 

 clypeus in length; front and vertex with tolerably strong, but 

 not deep, scattered punctures, becoming obsolete on cheeks 

 posteriorly ; space between hind ocelli slightly less than that be- 

 tween them and eyes; first joint of flagellum fully as long as two 

 following united; pronotum with a strong tooth on each side, and 

 sharply margined anteriorly; dorsulum sparsely punctured, with 

 an impressed line anteriorly in the middle, on each side of which 

 are two feebler, curved impressions, and posteriorly in the middle 

 are two parallel strong impressions, with a feebler longer one on 

 each side; scutellum flat, scarcely impressed ; postscutellum sub- 

 convex, entire; middle segment concave medially, the lateral surface 

 separated from the upper and posterior by a sharp ridge, running 

 from base to apex ; enlarged portion of petiole with sparse punctures, 

 broadest and rounder at base, the sides gradually converging to 

 apex, not rounded, the slender basal portion not as long as hind 

 coxse; second segment with a short, thick pedicel whose length 

 does not equal the width of petiole at apex, microscopically punc- 

 tured above, the ventral moiety with large punctures, very sparse 

 toward base; dorsals 3-6 rather compactly punctured, ventrals 

 3-6 with strong, separated punctures ; second submarginal Avith a 

 distinct radial side, Avhich is, however, a little less than the dis- 

 tance between the recurrent nervures on the cubital nervure. 

 Length 28-29 mm. 



Chapada, March, April. Four specimens. In coloration this spe- 

 cies resembles recurvirostris, but it is quite distinct. The straight, 

 not rounded or convex , sides of petiole and sharp lateral carina of 

 middle segment are salient features of this insect. 



