ZETHUS. 55 



Zethus niger 8auks. : Vespides, I, 1852, 21, 24, pi. viii, fig. 9.2 



A Z. Romandino differt metanoto carinato, foveolato et plicato; petiolo 

 globosiore et minus valde punetato ; seeundo abd. segmento globosiore, 

 magis pedunculato, et punctatiore ; segmeutis 3-5 minus punctatis; tertii 



margine in medio producto. 



Hab. Cayenne. 



51. Z. didymogaster Spin. 



Zethus didymogaster Spin. Ann. Soc. Ent. Fr., 1841, X, 133, O . 



Hab. Cayenne. 



This species differs from Z. binodis in its very wide clypeus, 

 having a straight border, armed with two distant teeth. (Has 

 not the author taken a male for a female ? Only the males have 

 the clypeus twice as wide as long.) 



52. Z. f iiscus Perty. 



Didymogastra fasca Perty, Delect. Anim. Artie. 145, pi. XXVIII, fig. 5, 



9 , 1830. 

 Zethus fuscus Sauss. Vespides, I, 19, 21 ; III, 120. 



Bab. Brazil. Amazon. 



53. Z. SaiaitSaii Sauss. 



Zethus Smithii Sauss. Vespides, III, 122, 9, £. 

 Metanoto striato; alis fusco-cyaneis. 



Hab. South America. 



SPECIES WIIICII I DO NOT KNOW. 



The following species of the genus Zethus, all from Brazil, 

 have been described by Fred. Smith in the Catalogue of the 

 Vespidoe of the British museum, page 11-18. 



Z. pallidus — sculptural is — dubius. 



Z. carinatus — a I bop ictus — grac il is — laevinodus. 



1 Typos in auctoris museo. 



2 Errata. Fig. 8, pi. viii, Vespides, I, does not represent this speoies, 

 but Z. piriformis. 



