20 HTMENOFTEBA OF AMERICA. [PART I. 



May be a variety of the preceding. 

 Hab. Antilles. 



8. Z. piriformis Spin. — 9 • Ater, nitidus, punctatus, sed rjibilominus 

 politus ; clypeo et fronte planatis; illo apice subemarginato, margin e 

 punctato, de reliquo hevi, substriato ; prouoto valde cristato-marginato, 

 sed baud bidentato, postscutello et nietanoto velutinis, argenteo-sericeis, 

 lioc parum striato, supra utrinque lsevi ; petiolo ovato-iuflato, nitido, 

 punctulato, margine tiavo-limbato ; secundi segmenti margine subja- 

 cente producto ; reliquis valde punctatis ; antennis subtus apicem versus 

 ferruginescentibus ; alis hyalinis, costa anguste nigra; celiola 2 a 

 cubitali trigonali. Losgit 0.017. — Variat seeuudo seguiento llavo-liinbato. 



Zethus piriformis Spix. Ann. Sou. Eut. Fr. X, 1S41, 135. — Sauss. Vespides, 



I, 15, 12. 

 Zelhus binodis Sauss. (per errorem) Vespides, I, pi. viii, fig. 8. 



Hab. Cayenne. 



This species is remarkable for its body appearing smooth, 

 although punctured, having the punctures apparently effaced. I 

 cannot say with certainty if this is really the species described 

 by Spinola. The 2d segment of the abdomen is swelled suddenly, 

 and globular, a character which distinguishes this Zethus from Z. 

 f rater nun. 



9. Z. fraternus Sauss. — Niger, punctatus ; punctis 2 frontalibus 

 fiavis. Prouotum paulum cristato-marginatum. Seutellum convexum, 

 sulco partitam. Metanotum minus punctatum, sericeum, clunibus 

 2 couvexis, sulco prof undo sejunctis et utrinque carina verticali spatiuni 

 striatum marginante instnmtis (non sunt ilia? carina? laterales metauoti, 

 sed faciei postica?). Petiolus ovatus, sat brevis, punctatus, inargine 

 flavo ; abdominis secundum segmentum distincte petiolatum, ovato-dila- 

 tatum. Ala? infoscata?, uosta nigra, apice et postice parum obscura?. 



% . Clypeus in dimidia parte inferiore flavus margine infero recto, dentibus 

 2 distanlibus nigris ; antenna? subtus, apicem versus fiava?. Longit 0.016. 



Zethus fraternus Sauss. Vespides, I, 1G, 14, 1S52; Revue Zool. X, 1858, 

 . 163. 



Hab. Brazil (lower provinces). Typus in museo Saussuriano. 



The swelling of the petiole is a little flattened, and wider than 

 in Z. piriformis; the second segment is more briefly pediculate, 

 more gradually swelled and less globular. The body is more 

 strongly punctured. 



