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. toltecusby 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. Z. miniatus 1 Sauss.— Parvulns, niger, caput et thorax mediocriter 

 profunda punctata; pronotum cristato-marginatum, angulis spiniformi- 

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

 bus notatus ; post-scutellum angulatum, rnargine postico shibconcavo, et 

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

 structum ; metanotum ferrugineum maxime excavatum, utrinque crista 

 verticali e post-scutelli angulis emissa instructum ; petiolus cylindricus 

 rugosissime cribratus ; secundo segniento globoso-dilatato, subsessile. 

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

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

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

 catse ; pedes antici et intermedii aurantii. Longit, 0.011 mm. 



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

 Antenna? % apice vix cochleatse. 



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

 Hab. Para. (Typus in museo Saussuriano.) 



16. Z. lobulatus Sauss. 



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



Hab. Brazil. Amazon. 



ff Thorax elongate, attenuated anteriorly, elliptical. 



IT. Z. Toltecus n. sp. — Niger, cinereo-sericeus, punctulatus; thorace 

 elongato, depresso, antioe attenuato ; metanoto crassissime foveolato- 

 puuctato, 4-carinato, foveola quadrata inter farinas instructo ; petiolo 

 oylindrico, mgosissimo ; 2° segniento subtus basi tuberoulato ; olypeo 

 transverso, rotundato ; antennis subtus, mandibulis, oapite subtus, liuea 



1 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. 



