_Gen. Char._: HEAD transversely subquadrate; _ocelli_ in a triangle on the _vertex_, which, as well as the _face_, is convex, the latter between the antennæ carinated as far as the clypeus; _antennæ_ short, subclavate, the second joint of the flagellum considerably the longest, the remainder equal; _clypeus_ slightly convex; _labrum_ transversely quadrate, convex; _mandibles_ acutely unidentate; _cibarial apparatus_ long; _tongue_ half its entire length, gradually acute, and fringed laterally with delicate hair; _paraglossæ_ slender, acute, membranous, not quite half the length of the tongue; _labial palpi_ more than half the length of the tongue, the basal joint longer than the two following, the remainder gradually decreasing in length, all conterminous; _labium_ half the length of the cibarial apparatus, broad; _maxillæ_ slender, subhastate, as long as the tongue; _maxillary palpi_ six-jointed, the basal joint robust, subclavate, as is the second joint, but more slender, the remainder filiform, gradually declining in length. THORAX oval; _prothorax_ inconspicuous; _mesothorax_ with a deep central groove; _bosses_ protuberant; _scutellum_ and _post-scutellum_ lunulate; _metathorax_ gibbous; wings with the marginal cell slightly appendiculated, two submarginal cells and a third commenced, the second receiving both the recurrent nervures, the first close to its commencement and the second beyond its centre; the _legs_ densely pilose, the posterior pair having their _coxæ_ and _trochanters_ beneath, their _femora_ in front, above, the _tibiæ_ and _plantæ_ all round, covered with long hair; _claws_ bifid. ABDOMEN ovate, the base subtruncate, the basal segment having a deep central impression at its base, the fifth segment fringed with short dense hair, the terminal segment with a triangular plate carinated in the centre, and fimbriated laterally, and all very slightly constricted. The MALE scarcely differs, except in having the _head_ rather more globose and more pubescent; and the _legs_, although still hairy, much less so than in the female. NATIVE SPECIES. 1. _Banksiana_, Kirby, ♂♀. 4-5¼ lines. _ursinus_, Curtis, iii. 101. (Plate VI. fig. 1 ♂♀.) 2. _calcaratus_, Scopoli, ♂♀. 3-4 lines. _ursinus_, Kirby. GENERAL OBSERVATIONS.