_Gen. Char._: BODY subhirsute. HEAD subglobose; _vertex_ broad, glabrous, with a deeply impressed cross upon its summit, in the centre of which the ocelli are placed in an almost straight line and contiguously; _antennæ_ short, filiform, geniculated, the _scape_ slightly curved, the basal joint of the _flagellum_ subglobose, its second joint as long as the terminal one and subclavate, the rest short, subequal, but gradually increasing in length to the terminal one, which is laterally compressed; the _face_ flat; _clypeus_ transversely lunate but straight in front; _labrum_ lunulate, tuberculated laterally; _mandibles_ broad and obscurely bidentate; _cibarial apparatus_ moderate; _tongue_ twice the length of the labium, tapering from base to apex, where it terminates in a small knob, and is clothed with short hair; _paraglossæ_ obsolete; _labial palpi_ as long as the tongue, the two first joints long and membranous and tapering to the apex of the second, which is acute, and about one-fourth the length of the first, it has the two very short, subclavate, terminal joints, which are conterminous, and articulated just before its acute apex; _maxillæ_ subhastate and acuminate; _maxillary palpi_ very short, linear, and equal. THORAX globose, pubescent, concealing its divisions; _metathorax_ truncated; _wings_ with three submarginal cells nearly equal, or the third the largest, the second receiving the first recurrent nervure at about one-third its length, and the second is received by the third submarginal cell near its extremity; _legs_ setose; the _posterior tibiæ_ convex, very slightly enlarging from base to apex, rounded at the extremity externally, and unfurnished with means to convey pollen; _posterior plantæ_ oblong, narrowly equal, and not auriculated; _claws_ bifid. ABDOMEN ovate, convex above, deflecting toward its extremity, and subglabrous on the disk, the terminal dorsal segment triangular, and its ventral plate straight at its apex with the lateral angles reflected, making it concave beneath and subcarinated longitudinally in the centre, or also triangular and the sides of the prominent angle deflected. The MALE differs in having the antennæ slightly longer, in being rather more pubescent, more highly and rather differently coloured, and its terminal segment merely rounded. NATIVE SPECIES. 3. _campestris_, Panzer, ♂ ♀. 6-9 lines. (Plate XIV. fig. 2. The fig. marked ♂ by mistake for ♀.) _campestris_, Kirby, ♀. _Rossiella_, Kirby, ♂. _Leeana_, Kirby. _Franciscana_, Kirby. _subterranea_, Kirby. 2. _Barbutellus_, Kirby, ♂ ♀. 6-9 lines. 3. _vestalis_, Fourcroy, ♂ ♀. 6-10 lines. (Plate XIV. fig. 2 ♀.) _vestalis_, Kirby, ♀. 4. _rupestris_, Fabricius, ♂ ♀. 6-10 lines. (Plate XIV. fig. 1 ♂ ♀.) _albinella_, Kirby, ♂. GENERAL OBSERVATIONS.