432 PROCEEDINGS OF THE ACADEMY OF [1899. 



extreme apex where they are large and coarse, anteriorly in 

 middle with a raised line, the usual posterior impressions absent ; 

 scutellum punctured posteriorly; postscutellum entire its hind 

 margin angular medially; middle segment scarcely depressed, 

 coarsely striated transversely, the sides likewise striated; stem of 

 petiole fully as long as hind coxa and trochanter, the enlarged 

 portion imjiunctate, shining, subfusiform, strongly depressed its 

 entire width just before apex, beneath before apex with a shallow 

 pyriform depression which is transversely rugose; second segment 

 above punctured along apical margin only, beneath the punctures 

 more distributed but quite sparse, pedicel slender, distinctly shorter 

 than first hind tarsal joint; remaining segments distinctly punc- 

 tured; radial side of second submargiual cell slightly greater than 

 the distance between the first transverso-cubital and first recurrent 

 nervures on the cubital nervure; third submargiual cell nearly as 

 long as high, rhomboidal, the outer nervure distinctly but not 

 strongly sinuous. Length 16 mm. 



Rio de Janeiro, November. One specimen. Quite remarkable 

 by the densely pubescent head and thorax, sculpture of middle 

 segment and dorsulum and polished, im punctate, petiole and most 

 of second segment. 



Zethus geniculatus Spin. 



Two ?, two cf specimens. Santarem. In the males of the 

 specimens I have referred to geniculatus, the ultimate antennal 

 joint is long and remarkably slender and acute, spiuelike; it is 

 quite as long as the two preceding joints united. 



Table of New species of Zethus. 



Pedicel of second segment shorter than width of first segment at 

 apex 2 



Pedicel of second segment longer than width of first segment at 

 apex 19 



2. Postscutellum entire, not emarginate, carinate, or dentate . 3 

 Postscutellum emarginate, dentate or carinate .... 6 



3. Petiole campanulate ; wings dark basally, pale apically ; pedi- 



cel of second segment scarcely evident. . . sessilis 9 cf . 

 Petiole not campanulate 4 



