When this insect was living it was probably of a light green colour; but it is now entirely of a dusky olive. Head small. Eyes round, and placed at a distance from each other. Antennæ small, and thread-like, and about half the length of the insect. Thorax long and slender. Tegmina thin, narrow, and diaphanous, of the same length with the wings; but narrower, and placed at a little distance from them. Wings also thin and diaphanous, and when closed extending to the anus. Abdomen slender and rounded. Legs small and long, the hinder ones being formed rather for running than jumping; the fore ones having thread-like tarsi. PEPSIS RUBRA. Plate XXXIX. fig. 6. ORDER: Hymenoptera. SECTION: Fossores. FAMILY: Pompilidæ. GENUS. PEPSIS, _Fabr. Latr._ Sphex, _Linn. Drury_. PEPSIS RUBRA. Corpore pedibusque nigro cyaneis, antennis nigris, alis rufis apice albis. (Long. Corp. 1 unc.) SYN. Sphex rubra, _Drury, App. vol._ 2. Pepsis Speciosa, _Fabr. Ent. Syst._ 2. 217. 83. _Syst. Piez._ 215. 45. _Pal. Beauv. Ins. d'Afr. et d'Amer. Hym. Pl._ 2. _f._ 5. HABITAT: Antigua (_Drury_). Saint Domingo (_Pal. Beauv._). Head and antennæ black; it has four palpi, no tongue, but strong jaws. Ocelli distinct. Thorax, abdomen, and all the legs deep mazarine blue, nearly black. Wings red; the tips being transparent. Legs furnished with spines at the tips of the tibiæ; the fore ones having only one, all the rest two. Fabricius (Syst. Piez. 214. 33.) refers this figure to the Sphex coerulea of Linnæus, which differs in having the wings ferruginous but black at the base ("basi nigræ," Linn.) and {85}white at the tips, and in the antennæ, being ferruginous at the tips. It is to be observed that Linnæus has described two species under the name of Sphex coerulea, the first belonging to the genus Pelopæus, and being the Sphex cyanea of Fabricius; and the second, above noticed, and being the auripennis of De Geer, which latter name, in order to prevent all confusion arising from the employment of the name of coerulea, it would be desirable to adopt. PELOPÆUS PETIOLATUS. Plate XXXIX. fig. 7. ORDER: Hymenoptera. SECTION: Fossores. FAMILY: Sphegidæ. GENUS. PELOPÆUS, _Latr. Fabr._ Sphex, _Drury_. PELOPÆUS PETIOLATUS. Fuscus, thorace abdomineque nitidis brunneis. (Expans. Alar. 1 unc.) SYN. Sphex petiolatus, _Drury, App. vol._ 2. HABITAT: Jamaica. Head and antennæ brown. Thorax and abdomen shining dark brown, and separated by a rather long peduncle. Wings brown and thin. Legs also brown; the fore ones having a single tibial spur, the rest having two. SPHEX PENSYLVANICA. Plate XXXIX. fig. 8. ORDER: Hymenoptera. SECTION: Fossores. FAMILY: Sphegidæ. GENUS. SPHEX, _Linn. Latr. &c._ Pepsis, _Fabr. Pal. Beauv._ SPHEX PENSYLVANICA. Nigra, abdomine petiolato atro, alis subviolaceis. (Expans. Alar. 1 unc. 6 lin.)