_Gen. Char._: HEAD transverse, scarcely so wide as the thorax, flat; _ocelli_ in an open triangle on the vertex; _face_ flat; _clypeus_ transverse, margined; _labrum_ transverse, slightly rounded in front; _mandibles_ bidentate; _cibarial apparatus_ moderately long; _tongue_ lanceolate, fringed with delicate hair; _paraglossæ_ about one-third the length of the tongue, abruptly terminated, lacerate and setose at the extremity; _labial palpi_ rather longer than the paraglossæ, the basal joint considerably the longest, all the joints subclavate and diminishing both in robustness and length to the apex; _labrum_ half the length of the entire apparatus, its inosculation acutely triangular; _maxillæ_ subhastate, as long as the tongue; _maxillary palpi_ six-jointed, less than half the length of the maxillæ, the joints short, subclavate and decreasing gradually from the base to the apex. THORAX densely pubescent, obscuring its divisions; _metathorax_ truncated; _wings_ with three submarginal cells, and a fourth slightly commenced, the second subquadrate and receiving the first recurrent nervure in its centre, the second recurrent nervure issuing from beyond the centre of the third submarginal cell; _legs_ all pilose, especially the posterior pair, which have hair beneath the _coxæ_ and _trochanters_, above only on their femoræ, but surrounding the _tibiæ_, and as dense externally upon their _plantæ_; _claws_ distinctly bifid. ABDOMEN ovate, truncated at the base, the segments banded at their apex, with decumbent down, which becomes densely and widely setose on the fifth segment, the terminal segment having a central triangular glabrous plate, carinated down the centre, and very rigidly setose laterally. The MALE scarcely differs, except in having the _antennæ_ less distinctly geniculated, the flagellum taking a sweeping curve, the _face_ and _clypeus_ much more pubescent, but the _legs_ sexually less so; the sexes are much alike. NATIVE SPECIES. 1. _tricincta_, Kirby, ♂ ♀. 5 lines. (Plate V. fig. 1 ♂ ♀.) _? Apis leporina_, Panzer. 2. _hæmorrhoidalis_, Fab. ♂ ♀. _hæmorrhoidalis chrysura_, Kirby. GENERAL OBSERVATIONS. This genus has been named without any reference to any peculiarity, Dr. Leach having applied a Proper name to it to designate it.