1899.] NATURAL SCIENCES OF PHILADELPHIA. 431 



indistinctly or finely so on sides, the lateral carina only evident at 

 base; stem of petiole a little longer than hind coxa, the enlarged 

 portion broadest and rounded basally, strongly punctured, con- 

 tracted just before apex; second segment above compactly punc- 

 tured, beneath with large sparse punctures, smooth at base, and 

 covered with short hairs, the pedicel rather thick, distinctly 

 shorter than the first hind tarsal joint; radial side of second sub- 

 inarginal cell distinctly shorter than the distance between the first 

 transverso-cubital and first recurrent nervures on the recurrent 

 nervure; third submarginal cell enlarged above, the outer nervure 

 gently sinuous. Length 20-21 mm. 



cf. — Sculpture coarser than in ? ; clypeus about twice as long 

 as broad, its teeth acute; first joint of flagellum but slightly 

 longer than the following two joints united, the ultimate joint quite 

 minute, much smaller than the penultimate, the two together 

 scarcely longer than the eleventh joint, which is deeply emarginate 

 beneath at apex. Length 16 mm. 



Chapada, January and March. Five 9 , one d specimens. 



Zethus aurulens Sauss. 



Four ?, one cJ* specimens. Chapada, March and April; 

 Sautarem. 



Zethus peculiaris n. sp. 



Black; abdomen polished; front, clypeus, vertex and thorax 

 above clothed with thick, long, yellowish-brown hairs; round spot 

 at each side of clypeus, dot behind the insertion of each antenna, 

 small one at summit of cheeks, line on pronotum anteriorly and 

 on four anterior tibire, spot at base of tegulre and at apex of four 

 anterior femora, and a small one at each side of apex of petiole, 

 yellow; scape and following three joints entirely and -a spot on all 

 the remaining joints beneath rufous ; wings subhyaline, a little 

 brownish along costal margin. 



9. — Head with strong separated punctures; clypeus rather long, 

 but little more than one-third broader than long, the fore margin 

 broadly truncate, unarmed; flagellum rather long, subclavate, the 

 first joint a little longer than the following two joints united; 

 space between hind ocelli about equal to that between them and 

 eyes; pronotum cristate, with a few subtile, indistinct punctures, 

 sharply dentate laterally; dorsulum with fine punctures except aL 



