38 HYMENOPTERA OP AMERICA. [PART I. 



; the 2d segment without any impression before its 

 er; scutel black; no macula under the wing. The interme- 

 diate femora have no yellow fasciae. The wings are washed with 

 brown, with a golden reflection; the 2d cubital cell generally 

 triangular; its radial side wanting or quite short. 



Clypeus and head gray-silky; abdomen golden-silky as in 



cus. 

 Bab. Mexico; the Oriental Cordillera. Orizaba. (6 £ 

 senl by Mr. Suniichrast.) 



It is not without hesitation that T separate this species from Z. 

 but the clypeus is decidedly of a different form, and the 

 coloration is quite the same in my six specimens, seeming to in- 

 dicate a decided species. The end of the antennas is quite black 

 as iu A -'■ 



2-1. Z. clirysopterilS Satjss. — Niger, ferrugineo-hirtus, statura? Z. 

 Westwoodi; capite latiore quam longiore, dense— punctato. Thorax 

 valde punctatos, retiuulato-rugosus ; pronoti margine cristato, augulia 

 prominentibus ; scutello sulco partito; metanoto lsevi, hirsuto, postice 

 foveola distincta, cariuis longitudinalibus 2 marginata instructo. Petio- 

 lufi ovato-cylindricus, inflatus, parte lineari b.-isali brevissima ; secun- 

 ilum segmentum globoso-dilatatum, vix pedun,culatum, fulvo-velutinuro. 

 Pnncta 2 frontis et pronoti anguloruui abdominisque segmentorum 

 limbus anguste flava; tarsi ferruginei; aire subferruginese, tegulis j>iceis 

 vel flavo-marginatis. Longit. 0.017. 



% . Clypeo punctato, dimidio inferiore aurantiaco, margine tenuiter nigro, 

 bid en t at o. 



Zethus chrysoptents Sauss. Vespides, I, 13, 8, pi. viii, fig. 7, £,1852; 

 Revue Zool. X, 185S, 66. 



II«t>. Probably from South America. (Typus in auctoris 

 museo.) 



25. Z. ferruginous Sauss. 



Zethus fefrugineus S.vr^s. Vespides, I, 14, 10, 1S52. 

 Bab. South America. Para. 



26. Z. cinercsrons Sauss. £.— Niger, cinereo-sericens ; clypeo 

 piano, punctato-striato, bidentato; capite dense punctato; thorace eri- 

 brato, striato-mgoso, antice cristato, angulato; post-scutello truncato; 

 metanoto postice producto, rugoso, Iateraliter cristato-carinato ; in medio 

 foreolato sed haud bicarinato; petiolo brevi, globoso-davato, baud 

 cribrato; abdom. secundo segmento subsessili, sed piriforme-dilatato 

 (haud globoBo),sericeo.— Pnncta 2 frontis, pronoti margo.post-scutellum 



