418 PROCEEDINGS OF THE ACADEMY OF [1899. 



between hind ocelli equal to slightly more than half of that between 

 them and eyes; pronotum cristate, obtuse at sides, with coarse more 

 or less confluent punctures; dorsulum with separated punctures, 

 anteriorly with an impressed line medially and four impressed 

 lines posteriorly, the inner two of which are deep, the others indis- 

 tinct; postscutellum prominent, or subdentate at sides; middle seg- 

 ment broadly furrowed, the convexities rugose but not coarsely, 

 the carina between upper and lateral surface distinct; petiole as in 

 Z. hexagomis, as are also the pedicel and sculpture of dorsal sur- 

 face of second segment, the punctures of the ventral surface of the 

 latter segment present on the base; first and second transverso- 

 cubital veins uniting above; third submarginal cell widened nearly 

 one-quarter above. Length 17-18 mm. 



cf. — Front closely striato-punctate; anteunse hooked at apex, the 

 ultimate joint as long as the two preceding united, the penulti- 

 mate quite small, flagellum short, the first joint fully as long as the 

 following two joints united; clypeus about twice as broad as long, 

 the anterior teeth more distinct. Length 13 mm. 



Chapada, March and February. Eight ? and one d" speci- 

 mens. Seems to resemble Z. rufinodus in coloration, but judging 

 from the figure of that species given by Saussure (PI. vi, f. 3, 

 Vespides, iii), the petiole is of an entirely different shape. 

 Zethus pallidus Sm. 



Santarem. One example. This species has the postscutellum 

 strongly bidentate, almost bispinose and the dorsulum has two 

 smooth raised lines; the petiole campanulate. The entire insect is 

 rather densely covered with short brownish or yellowish hairs. 

 Zethus productus n. sp. 



Rufous and black; body of abdomen with brown pile; clypeus, 

 mandibles, antennre except scape beneath; thorax except beneath, 

 legs and abdomen from and inclusive of apex of second segment 

 rufous; dot behind each antenna, scape beneath and line at apex of 

 petiole, yellow; otherwise the insect black ; wings fusco-violaceous. 



?. — Head above and on cheeks rugoso-punctate, the front 

 coarsely striato-punctate; clypeus somewhat hexagonal, broader 

 than long, obtuse at sides, with large rather shallow punctures, the 

 fore margin broadly subtruncate, indistinctly or subdentate later- 

 ally; a T-shaped carina between the bases of antennae; first joint 

 of flagellum about as long as the following two united, the scape 



