some allied Genera of Hymenopterous Insects. 273 



second submarginal cell, which is sometimes petiolated. The re- 

 current veins also vary somewhat in the place of their connection 

 with the submarginal cells, sometimes being separate from, and 

 sometimes inosculating with, the veins which separate these cells. 



Sp. 1. Trigonalys melanoleitca, Westw. (PI. XV. fig. 4.) 



Nigra punctata, subpubescens, capite antice, et pone oculos 

 maculisque duabus minutis verticis, metathoracis lunulis 

 duabus segmentoque Imo abdominis albis, alis pone medium 

 fuscis. 



Long. corp. h'n. 4, expans. alar. lin. 7. 



Habitat in America Meridionali. Bahia. 



In Mus. Britann. et Westwood. Communic. Dom. Turner. 



Caput et abdomen nitida, thorax obscurus, totum corpus griseo- 

 pubescens ; metathorax albus, in medio linea tenui nigra, 

 postice subito dilatata ; abdomen punctatum, segmento Imo 

 nitido, segmentis 2 — 5 lateribus albo-maculatis ; pedes nigri, 

 griseo-villosi, coxis, trochanteribus femoribusque albo-variis ; 

 alse hyalinae, dimidio apicali fusco, versus angulum analeni 

 pallidiori. 



Sp. 2. Trigonalys Serv'/llei, Westw. 



Nigra, parte postica thoracis et abdominis basi pallide luteis, 



alis immaculatis hyalinis. 

 An Ccelms Servillei, Lepell. de St. Farg. Guer. Rev. Zool. 

 1 842, p. 84 ? Magnitude Tr. mclanoleztcce. 



In Mus. Dom. Serville, Parisiis. An varietas prsecedentis ? 



Sp. 3. Trigonalys obscura, Westw. 



Nigra obscura, capite piano nitido, abdomine segmento Imo 

 margine postico luteo, alis obscure fuscis. 



Long. Corp. lin. 7, expans. alar. lin. 13. 



Habitat in Surinamia. Cordua. 



In Mus. Reg. Berol. 



Syn. Sphex depressa, De Geer Mem. vol. 3, pi. 30, fig. 7, teste 

 Dom. Erichson. 



Antennae et pedes nigri fusco-sericantes, tibiis tarsisque apice 

 fuscis; abdomen fusco-pubescens, segmento Imo ad apicem 

 obscure luteo, subtus omnino luteo ; alee anticee obscure 

 fuscce, versus angulum analem magis hyalinae, vena penul- 

 tima transverso-cubitali intus ramumparvum, apice fuscatum, 

 emittit. 



