424 PROCEEDINGS OF THE ACADEMY OF [1899. 



portiou elongate-ovate, rather narrowed and scarcely narrowed to 

 apex with large punctures strongest on sides; second segment 

 above compactly punctured, beneath with large separated punc- 

 tures, smooth at base, the stem short, not as long as the width of 

 apex of petiole, but still it is more evident than in proxhnm or 

 rugosiceps ; radial side of second subraarginal cell shorter than the 

 distance between the first transverso-cubital and first recurrent 

 nervures on the cubital nervure; third submarginal higher than 

 long, the outer nervure gently sinuous. Length 12 mm. 



Corumba, April. One specimen. Resembles prozimus and 

 rugosiceps in coloration, but the sculpture of head is different, 



Zethus coriarius n. sp. 



Black ; abdomen with sericeous pile ; a linear spot at each side 

 of apical margin of petiole, yellow ; wings subhyaline, with ante- 

 rior half of costal cell black. 



9. — Head with large, close, shallow punctures; clypeus convex 

 about twice as broad as long, fore margin broadly subtruncate, 

 subdentate laterally, an indistinct T-shaped carina between an- 

 tennse; flagellum strongly clavate, the first joint distinctly shorter 

 than the following two united; space between hind ocelli equal to 

 or slightly greater than the distance between them and eyes ; prono- 

 tum cristate, subdentate or angularly produced at sides; rugoso- 

 punctate; dorsulum with coarse separated punctures with a shallow 

 impressed line anteriorly in the middle, the usual posterior impres- 

 sions entirely wanting; scutellum and postscutellum coarsely punc- 

 tured, dentato-carinate laterally; middle segment not rugose, 

 tolerably smooth, coriaceous, concave medially with two converg- 

 ing carina running from postscutellum and quite sharp at base, 

 lateral carina distinct; petiole subcampanulate, stem longer than 

 hind coxa and trochanter, slender, enlarged portion with large 

 separated punctures, a little narrowed to ap'ex; second segment 

 above with shallow punctures except toward base which is smooth 

 or finely punctured, ventral surface with larger punctures, smooth 

 and shining at base, pedicel short and stout; radial side of second 

 submarginal cell about equal to the distance between the first trans- 

 verso-cubital and first recurrent nervures on the cubital nervure; 

 third submarginal cell higher than long, rhomboidal, the outer ner- 

 vure nearly straight. Length 12 mm. 



