22 HTMENOPTERA OF AMERICA. [PART I. 



terminal bend, which is sometimes entirely tawny. The yellow 

 or tawny border of the prothorax is interrupted by some black 

 points in both sexes. 



Var. Size small, 13 mill. Prothorax black. 



Bess. a. diff. — Approaching to Z aztecus, but very distinct 

 by the pedicle of the second segment being sensibly longer ; by 

 the petiole, of which the inflation is more lengthened, which does 

 not form any prominence above and which is not strongly punc- 

 tured. 



Hab. The hot regions of the gulf side of Mexico. Tampico. 



N. B. — The type from which I first described this species, /. /., 

 has the "etiquette" Pefion de los Banos, a locality of the valley 

 of Mexico (cold region). This should be an error of the 

 "etiquette," for I have myself taken this species in the region 

 approaching the hotter zone of Mexico. 



11. Z. Jurinei Sauss. — Gracilis, niger, nitidus ; capiteet thorace tenui- 

 ter punctatis (punctis quasi obliterates) ; hoc nitido, metanoto brevi, albi- 

 dosericeo, planato. Petiolus ovatus, valde dilatatus et maxiine depressus, 

 nitidus, vix punctatus ; secundum abdom. segmeutum basi petiolaturn, 

 dein globoso-dilatatum, ut petiolus nitidissiinuin ; segmenta reliqua 

 punctata. Pronoti inargo, macula subalaris et tegularnm limbus posti- 

 cus, puncta 2 in scutello, naaculse 2 rotundatae in metanoti parte imma, 

 flava ; abd. segmentorum limbus tenuissime albidus vel flavus. Alae 

 infuscatae. Longit, 0.015 mm. 



% . Clypeus flavus, sericens, superne niger, et margiue tenuissime nigro, 



subbidentato ; antennae subtus apicem versus fulvae. 

 9 • Clypeus integer subtruncatus, niger, sublaavis. 



Zethus Jurinei Sauss. Vespides, I, 1852, 15, 13; III, 118; Revue Zool. X, 

 1858, 162. 



Hab. Antilles? South America. Caracas. (Typus in museo 

 Genevensi et Saussuriano.) 



12. Z. nigricorilis n. sp. — Nigerrimns, nitidus, punctnlatus ; meta- 

 thorace et abdomine cinereo-sericeis ; abdominis petioli margine et linea 

 submarginali angusta 2' segmenti, sulfureis ; alis infumatis, costa nigra ; 

 9 antennis et clypeo planato nigris, % clypeo albido, margine tenuiter 

 nigro ; antennarum flagello subtus albido-annulato ; tibiis intermediis 

 linea albidaornatis. 



J % . Total length 15 mill. ; wing 10 mm. 



The same form and sculpture as Z. aztecus. Jet black, im- 

 maculate, having only the yellow border of the petiole and a very 



