ZETHUS. 39 



et petioli limbus frequenter tiava; tarsi f usci ; aire infascatse, secundum 

 contain uigrae, tegulis feriugineo-uaarginatis. Longitudo, 0.015. 



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



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

 rinense.) 



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

 thorace rugose, petiolo minus punctato et globosiore. 



The male is not known ; some cloubt still exists about the place 

 this species must occupy. 



27. Z. biglumis Spin. 



Zethus biglumis Spinola, Ann. Soc. Ent. Fr. X, 1841, 135, 83. — Sacss. 

 Vespides, I, 19, 20. 



Bab. Cayenne. 



28. Z. discoelioides Sauss. — Niger, cnpite et thorace valde cri- 

 brato-puuctatis, puuctis connuentibus rugosis ; clypeo rugoso, cri- 

 brato, subbidentato ; pronoto cristato-maiginato, biangulato ; scutello 

 sulco partito ; metanoto supra foveola striata instructo, cujus margines 

 laterales fere cariniforines sunt ; abdominis primo segmento brevi, ovato- 

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

 form!, sericeo. — Tegulae ferruginese ; frons et post-scutellum riavo-bipunc- 

 tata ; petiolus flavo limbatus ; pedes fuscescentes ; alse paulum infuscatse, 

 aureo-niteutes. £> • — Longit. 0.013. 



Zethus discozlioides Sapss. Vespides, I, 17, ' 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 and truncate 

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

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



8. Species which liaise more the appearance of Eumenes or Discoelius. Head 

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

 petiole more as in the Eumenes (f Division a. 



1 Last line of this page (of Vespides), instead of Zethus, read Discwlius. 



