, ZETHUS. 27 



considered a Mexican variety of this ; but it has the mandibles a 

 little less indented, the petiole a little thicker and shorter ; the 

 lamella of 3d segment less cut out ; and a less high coloration. 



It approaches in the same way toward Z. lobulatus. 



It differs from Z. toltecus by its short thorax, the carina? of 

 metathorax which converge on each side to a sharp angle, etc. 



Its appearance is that of a true Zethus. 



Hab. Mexico. The Oriental Cordillera, Orizaba (Mr. Sumi- 

 chrast). 



15. 25. fittiniatus 1 Sauss. — Parvulus, niger, caput et thorax mediocriter 

 profuude punctata; pronotum cristato-margmatum, angulis spiniformi- 

 bus ; mesonoti discus sulcis 2 profundis brevibus e scutello emergenti- 

 bus notatus ; post-scutellum angulatum, margine postico subconcavo, et 

 in lateribus cristulis 2 (ut dentibus e scutelli angulis einissis) in- 

 structum ; metauotum ferruginenm maxime excavatum, utrinque crista 

 vertieali e post-scutelli angulis emissa instructum ; petiolus cylindricus 

 rugosisfime cribratus ; secundo segniento .globoso-dilatato, subsessile. 

 Caput fulvo sericeum, aurantiacum, fronte nigro; mandibulis et anten- 

 nis aurantiacis ; pronotum, macula? subalares et scutellares, aurantiaca; 

 abd. segmenta tenuissime flavo-limbata ; alse secundum costam infus- 

 cata? ; pedes antici et intermedii aurantii. Longit, 0.011 mm. 



Clypeus 9 discoidalis, % subtruncatus ; iu utroque sexu aurantiacus. 

 Antennae % apice vix cochleatse. 



Zethus miniatus Sauss. Revue Zool. X, 1858, 64. 

 Hab. Para. (Typus in museo Saussuriano.) 



16. K. lobulatus Sauss. 



Zethus lobulatus Sauss. Vespides, III, 116, 2, pi. vi, fig. 4, $, 1854. 



Hab. Brazil. Amazon. 



ft Thorax elongate, attenuated anteriorly, elliptical. 



If. Z. Toltecus n. sp. — Niger, cinereo-sericeus, punctnlatus ; thorace 

 elongato, depresso, antice attenuate ; metanoto crassissime foveolato- 

 puuetato, 4-carinato, foveola quadrata inter carinas instructo ; petiolo 

 eylindrico, rugosissimo ; 2^ segmento subtus basi tuberculato; clypeo 

 transverso, rotundato ; antennis subtus, mandibulis, capite subtus, linea 



i Perhaps a variety of the following, with the second cubital cell less 

 retracted. In this the excavation of the border of the second segment 

 was probably due to an accident of nature. 



