ZETHUS. 4" 



above, distinctly punctured; by its second segment with its less 

 extended pedicle, and by the yellow markings of all the body. 



It differs from Z. Matzicatzin, in its smaller size, in its much 

 more lengthened thorax, having a mesothoracic disk longer than 

 wide; in its metathorax, devoid of middle carinas and of smooth 

 spaces at the superior angles; in its scutellum, simple, depressed, 

 angular (not einarginate) posteriorly; in its less enlarged and 

 more punctured petiole, and in its head smaller, without swelling 

 of the vertex. 



The % differs in its clypeus, quadrate, large, convex and notched 

 as in the Z. Poeyi, not flattened and advanced in the middle as 

 with the Matzicatzin; by the antennas terminating in a spiral, by 

 the ocelli placed upon a scarcely oblique plane, etc. 



Hab. The island of Cuba. This beautiful insect was given me 

 by Prof. F. Poey. 



Observation.— In the figure, the thorax is too large and the form of the 

 abdomen is not perfectly natural. 



40. Z. RomandinUS Sauss.— Niger, cinereo-sericeus, capite lato, 

 dense punctato; thorace grosse cribrato, antiee cristato-marginato ; 

 scutello convexo, sulco, bipartito ; metauoto convexo, baud foveolato, 

 velutino, tenuiter punctato, supra utrinque spatio nitido lsevi ; petiolo 

 dense punctato, nitido, postice pauluru attenuato, flavo-marginato; 

 secundo segmento sat breviter pedunculate tanquam in Didymogastra, 

 piriformiter dilatato. marginem versus tenuiter punctato, tenuissime 

 flavo seu ferrugineo-limbato ; reliquis punctatis, piceo-limbatis ; teguli.s 

 ferrugineo marginatis, pedibus, fuscescentibus ; tibiis intermediis flavo- 

 variis; alis diapbanis, subfuscescentibus. 

 Q . Clypeo transversim quadrato, flavo, tenuiter bidentato; antennis sub- 

 tus apicem versus flavo-annnlatis et apice cochlea fulva. 



Longitudo, 14 mm. ; alse, 10 mm. 



Zethus Romandinus Sadss. Vespides I, 20, 22, pi. ix, fig. 1, 2 , 1852. 

 Revue de Zool. X, 1S5S, 164. 



Hab. Cayenne. (Typus in auctoris musaso.) 



This Zethus constructs with woody fibres and gummy materials 

 several rounded cells, with thick walls toward the bottom and 

 irregularly united, recalling a little those of Bombus (see Sauss. 

 Yespides, I, pi. ix, fig. 1, c). The instincts of these insects appear 

 to progress toward the habits of the Social W asps. 



