430 PROCEEDINGS OF THE ACADEMY OF [1899. 



lateral carina only present at base; stem of petiole about as louf^ 

 as hind coxa, the enlarged portion somewhat fusiform, but broadest 

 basally, with fairly strong, separated punctures; second segment 

 above with fine close punctures basally, those apically becoming 

 larger and sparser, the ventral with strong, separated punctures 

 except toward base which is smooth, pedicel slender, nearly as 

 long as one-third the length of segment, shorter than first hind 

 tarsal joint; radial side of second submarginal cell nearly as great 

 as the distance between the first trausverso-cubital and first recur- 

 rent nervures on the cubital nervure; third submarginal cell 

 distinctly broadened above, the outer nervure gently sinuous. 

 Length 14 mm. 



Corumba, April. One specimen. 

 Zethus Hilarianus Sauss. 



Five ?, one cJ*, specimens. Chapada, March and December; 

 Uacarizal, February. 



Zethus coloratus n. sp. 



Rufous in greater part; the following parts black: front, tips 

 of mandibles, cheeks on lower part, flagellum above from apex of 

 third joint, sutures of thorax and its ventral surface entirely, a 

 blotch on the enlarged portion of petiole, second segment except 

 base and apex, and base of third segment; otherwise the insect 

 rufous, the coloration varying but little; wings fuscous, with 

 purplish eftulgence. 



?. — Head with strong, shallow, confluent punctures, the front 

 longitudinally rugose ; clypeus more than twice as broad as long, 

 more strongly punctured than the rest of head, the fore margin 

 armed with a tooth laterally ; a small tubercle between the bases 

 of antennae, flagellum subclavate, the first joint as long as the 

 second, thii'd and about half of fourth joints united; space be- 

 tween hind ocelli distinctly less than that between them and eyes; 

 pronotum cristate, with coarse, close punctures indistinctly sub- 

 dentate laterally ; dorsulum rather closely punctured at base and 

 apex, otherwise more sparsely, with an impressed line anteriorly 

 and medially with two longitudinal swelhngs or raised lines, the 

 posterior impressed lines tolerably distinct; postscutellum trans- 

 versely compressed, with a small tubercle medially; middle seg- 

 ment depressed medially rather coarsely striated transversely. 



