1899] NATURAL SCIENCES OF PHILADELl'HIA. 419 



not longer than pedicel and following three joints united; space 

 between hind ocelli greater than that between them and eyes; 

 pronotum cristate, acute and produced at sides, with coarse con- 

 fluent punctures; dorsulum rugoso-punctate with a shallow^ im- 

 pressed line anteriorly in middle, the usual posterior impressed 

 lines absent; scutellum not impressed; postscutellum broadly 

 emarginate, dentate at sides; two short indistinct carinae originate 

 near sides of postscutellum, and extend down on middle segment, 

 the latter broadly furrowed or depressed down middle, the two con- 

 vexities obliquely striated, the strise overrunning the sharp lateral 

 carina a short distance upon the sides, which are otherwise quite 

 smooth; petiole with stem long, nearly as long as first hind tarsal 

 joint, stout, the enlarged portion ovate, broadest at apex, gradu- 

 ally and evenly enlarged from its junction with the stem to some- 

 what behind its middle, whence it is gradually and slightly nar- 

 rowed to apex, the punctures strongest at sides, and down the 

 middle there is a distinct, but not sharp, carina, which, while not 

 continuous, is found also on the stem ; second segment finely and 

 closely puDctured above, much more strongly so beneath, the pedi- 

 cel very short and thick; radial side of second submarginal cell 

 about equal to the distance between the first transverso- cubital 

 and the first recurrent nervures on the cubital nervure ; third sub- 

 marginal Avidest above, the outer nervure nearly straight. Length 

 16-17 mm. 



d". — Colored like 9, except that the red is more widely diffused 

 over the abdomen, and the mandibles are yellowish; flagellum 

 stout, hooked at tip the ultimate joint thick, obtuse at tip, longer 

 than the penultimate which is minute, and together with the elev- 

 enth joint is nearly twice as long as the ultimate; middle segment 

 rugose, the carinae originating near each side of postscutellum quite 

 strong; stem of petiole shorter and thicker, carina obscure, the 

 enlarged portion more robust and coarsely punctured. Length 

 14 mm, 



Chapada, January, March, April, December. Fifteen ? , one 

 d^ specimens. The strongly 'produced pronotal angles, rugosity of 

 head, and carinated petiole are peculiarities of this S]3ecies. 

 Zethus thoracicus n. sp. 



Black; head (except front and a line across vertex), pronotum 

 entirely, tegultie, two spots on scutellum and postscutellum, two 



