ZETHUS. 33 



et petioli limbus frequenter flava ; tarsi fa.sci ; alae infascatse, secundum 

 costani nigrae, tegulis ferrugineo-marginatis. Longitudo, 0.0)5. 



Zethus cinerascens Sactss. Vespides, III, 117, 3, 1854. 



Hab. Brazil. (2 9 in inuseo auctoris ; typus in museo Tau- 

 riueiise.J 



Z. fraterno affinis, at differt pronoto cristate et angulato, 

 thorace rugose, petiolo minus punctato et globosiore. 



The male is not known; some doubt still exists about the plaee 

 this speeies must occupy. 



2?. Z. biglumis Spin. 



Zethus biglumis Sfinola, Ann. Soc. Ent. Fr. X, 1841, 135, 83. — Sauss. 

 Vespides, I, Id, 20. 



Hab. Cayenne. 



28. Z. disc«eli©ides Sauss. — Niger, capite et thorace valde eri- 

 brato-punctatis, punctis confluentibus ru^osis ; clypeo rugoso, ci i- 

 brato, subbidentato ; pronoto cristato-marginato, biaugulato ; scutello 

 sulco partito ; metanoto supra foveola striata instructo, cujus margines 

 laterales fere carini formes sunt; abdominis primo segmento brevi,ovat<>- 

 campanulato, inflato, truncato, valde punctato; secundo segmento piri- 

 formi, sericeo. — Tegulseferruginese; frons et post-scutellum riavo-bipunc- 

 tata ; petiolus flavo limbatus ; pedes fuscesoentes ; alae paulum infuscalae, 

 aureo-nitentes. J . — Longit. 0.013. 



Zetlius disccel hides Sactss. Vespides, I, 17, 1 17, 1852. 

 Hab. South America. Para. 



Species moderately stout — viewing its short form and strongly- 

 inflated petiole — and resembling to some extent Z. cinerascens, 

 though its 2d abdominal segment is less pyriform and the clypeus 

 more strongly punctured and not distinctly striate. 



This species, in view of its petiole, campanulate ami truncate 

 rather than contracted behind, might almost be placed in section .3. 

 (This form shows itself also among the Z. spirtipes.) 



8- Species which hare more the appearance of' Eumenes or Disccefius. lLtni 

 less inflated, less hollowed out at the occiput; thorax of moderate > 



petiole more as in tie Jlitiueius tf Division a. 



1 Last line of this page (of Vespides), instead o( Zethus, read Disc 



