50 HYMEXOPTERA OF AMERICA. [PART T. 



this species deserves to be noted as fit to serve as the type of one 

 section of this genus. 



B. Antennae of % terminated by a hook. 



43. Z. HilarianilS Sauss. — Gracilis, niger; capite dense punctato, 

 supra et pone oculos tumefacto ; thorace minus dense punctato ; pro- 

 noto valde cristato-marginato, sed angulis haud acutis ; mesouoti disco 

 carinis 2 lsevilms trajecto; post-scutello medio subdentato; metanoto 



velutino, rugoso, striato, in medio canaliculato; abdominis petioli 

 tumefactione ovata, sat globoso-inflata punctulata; secundo segmento 

 globoso, sericeo, basi sat longe petiolato (petiolus tertiam partem longi- 

 tudinis efficiens); segmentis reliquis punctatis. Corpus omnino velu- 

 tinum, argenteo-sericeum ; puucta frontalia 2, niaculse 2 post-oculares, 

 antennarum articuli 1-3 et apex, thorax, petioli latera et pedes, rufa ; 

 petioli apex et lineola utrinque in secundi segment! petiolo, flava ; seg- 

 mentorum linibus tenuiter piceus vel rufus. Alae infuscatse, costa nigra. 

 Lo'ngit, 0.016 mm. 



J . Clypeo convexo, punctato, apice late subexciso, tridentulato; maculis 

 2 lateralibus rufis. 



% . Clypeo truncato, rufo vel flavescente macula media et basi nigris, vel 

 nigro margine infero rufo et laterali flavo ; antenuis apice ultimo 

 in in u to rufo. 



Var. Color variabilis, plus minusve rufescens vel nigrescens ; disco 

 mesonoti obscuro vel nigro, carinis rufis ; etc. 



Zethus Hilarianus Sauss. Vespides, III, 120, 7, pi. vi, fig. 6, 9 , 1854. 



Varies in having the margin of pronotum and the post-scutel 

 yellow, and in the distribution of colors, the reddish and blacK 

 passing one to the other; but, nevertheless, a distinct species 

 by its mesothoracical carinas. 



Hab. Brazil. Middle of the province of Goyaz. (The type 

 is in the Paris museum.) — Venezuela, Caracas. 



44. Z. geniculates Spin. 



Didi/morjastra geniculata Spin. Mem. Acad. Turin, XIII, 1853, 80, 60. 

 Zethus geniculates Sauss. Vespides, I, 22; III, 120, 6. 



Metanoto postice bicarinato; colore aflinis Z. nigro. 



Hab. Brazil. Para. (Typus in mus. Taurinense.) 



45. Z. diconiboda Spix. — Niger, gracilis, dense punctatus, cinereo- 

 sericeus ; pronoto antice cristato-marginato, angulato; mesonoti disco 

 bicarinato; metanoto convexo, velutino, baud rugoso, in medio striato. 







