42 HYMENOPTERA OF AMERICA. [r-ART T. 



petioli margo flavo-notatus ; ahe secundum venas iufuscatae. Longit, 

 0.011. 



Zethus parvulus Sauss. Vespides, III, 119, 5, pi. ii, fig. 1, £ ,' 1854. 



Hab. Brazil. South of the Province of Goyaz. (Collected 

 by the savant botanist Auguste de St. Hilaire.) 



This species approaches to the form of Z. Montezuma ; but it 

 is much less coarsely punctured, smaller, and very clearly recog- 

 nizable by the arcuate ridge of the post-scutel, which in com- 

 tinuation of the carina of the metathorax, forms a prominent 

 horseshoe. 



y. Petiole quite linear, filiform, depressed, very much elongate, as in Eumenes 

 of Division £. The appearance of a Calligaster. 



31. Z. strigOSUS n. sp. — Niger, fnlvo-sericeus, parura flavo-ornatum ; 

 pro- et mesonoto valde oblique strigatis ; metanoto rugoso; petiolo linear i ; 

 20 segmento basi breviter pedunculato; pedibus nigris, ilavescenti- 

 pilosis ; alis subhyalinis. 



J . Total length, 14 mm. ; wing, 11 mm. 

 % . Total length, 12 mm. ; wing, 8^ mm. 



?. Slender. Head stri gate-punctured. Prothorax sharply 

 margined, angular on each side, but not spined, obliquely strigose. 

 The whole disk of mesothorax strongly obliquely strigose and 

 wrinkled; the striae converging against the middle carina. 

 Seutellum shining punctate, a little suleate in middle, as the post- 

 scutellum. Metathorax rugose, velutinous, wrinkled on each 

 side, at base parted by a channel ; the lateral canthi carinated 

 on the sides. Petiole very long and slender, not globulously 

 swollen, but quite linear (as in Eumenes of Division Zeta) flat- 

 tened, shining, and parted by an impressed line, punctate on the 

 sides. Collar of the 2d segment distinct; the hinder margin of 

 this segment very slightly reflexed. 



Black, furnished with a yellowish-silky, or rather golden 

 pubescence; the metathorax and pleura with cinereous pubescence. 

 A line on the base of the inner margin of mandible, a line on the 

 scape, two dots on the front, a very narrow line on both margins 

 of prothorax, the post-tegula3, angles of post-scutellum, and two 



1 The male of this species is not known. It is possible that it should 

 be placed in section d. 



