Head small and hairy, being concealed beneath the thorax. The upper part shines like silver. Mouth of a greyish colour, and furnished with four palpi, whereof two are long and the other two short and thick. Eyes not to be discerned. Antennæ about half the length of the insect; small, and filiform, but full of joints. Thorax and abdomen dark lead-coloured, shining like polished metal; being furnished along their sides with short hairs. The former has a cream-coloured stripe crossing it from side to side; it is also margined. In some specimens, the middle part of the abdomen, from the thorax to the tail, is of a silvery white; but in others the last ring only is so. At the extremity of the abdomen are placed three tails, of equal lengths, like bristles, but very hairy. These tails are in length about one-third of the whole insect; and, when the creature is alive, are always carried in the position {77}represented in the figure. The middle one seems immoveable, the others are not. All the under part of the insect appears of a shining, silvery, white colour; and near the extremity of the abdomen are placed four little horny filaments, two on a side. Legs silvery. Thighs and tibiæ broad and thin. MILESIA VIRGINIENSIS. Plate XXXVII. fig. 6. ORDER: Diptera. SECTION: Athericera. FAMILY: Syrphidæ, _Leach_. GENUS. MILESIA, _Latreille_. Musca, (_Drury_). MILESIA VIRGINIENSIS. Fulva, thorace 2- abdomine 6-fasciato, hujus fasciis 1 et 2, 3 et 4, 5 et 6, lineâ longitudinali connexis. (Long. Corp. fere 1 unc.) SYN. Musca Virginiensis, _Drury_, _App. vol._ 2. Milesia ornata, _Fabr. Syst. Antl._ 188. _Wiedemann Ausseur. Zw. Ins._ 2. 106. HABITAT: Virginia. Eyes black. Front of the head cream-colour. Antennæ like short hairs. Thorax and abdomen yellow, with black rings. Wings transparent. Legs yellow, and furnished with small hooks at their extremities. Breast black, with yellow spots and patches. Ocelli distinct. CÆLIOXYS? ANNULARIS. Plate XXXVII. fig. 7. ORDER: Hymenoptera. SECTION: Mellifera. FAMILY: Apidæ. GENUS. CÆLIOXYS? _Latreille_. Apis, _Drury_. CÆLIOXYS? ANNULARIS. Atra, capite marginibusque posticis segmentorum abdominalium cinereis, antennis atris, pedibus fuscis. (Magn. Apis mellific.) SYN. Apis Annularis, _Drury_, _App. vol._ 2. HABITAT: New York. Head ash-coloured. Eyes brown. Ocelli distinct. Tongue very distinct. Antennæ black, and the length of the thorax, which is black likewise. Abdomen black, with ash-coloured rings, both above and underneath, terminating in a sharp point. Legs brown; the fore-ones being nearly as long as the hinder. PLATE XXXVIII. [Illustration] STIZUS SPECIOSUS. Plate XXXVIII. fig. 1. ORDER: Hymenoptera. SECTION: Fossores. FAMILY: Bembecidæ. GENUS. STIZUS, _Latr. Jurine_. Sphex, _Drury_. Vespa Et Larra p. _Fabr._