_Gen. Char._: HEAD subglobose, concave, posteriorly fitting the prothorax and about as wide as the thorax; _ocelli_ placed far forward on the vertex, which is wide and convex, in a curved line; _antennæ_ filiform, sometimes subclavate, short, and geniculated, the _scape_ robust, as long as the four following joints, the basal joint of the _flagellum_ globose, its second joint clavate and as long as the terminal one, the remainder short, subequal, and gradually but slightly increasing in length; the _face_ flattish; the _clypeus_ a truncated triangle, convex; _labrum_ longitudinally oblong, a little laterally distended at the articulation, from whence the sides are parallel; _mandibles_ broad at the apex, obscurely tridentate, the internal teeth obtuse and short; _cibarial apparatus_ long; the _tongue_ three times the length of the labium, clothed with short hair and tapering from the base to the acute apex; _paraglossæ_ very short, coadunate at the base and acuminate at the apex; _labial palpi_ more than half the length of the tongue, the two first joints membranous and long, the basal one the broadest, seated on a petiole and not so long as the second, which tapers to an acute point, before the apex of which the remaining two short subclavate conterminous joints articulate; _labium_ about one-third the length of the tongue, acutely produced in the centre of its inosculation; _maxillæ_ as long as the tongue, subhastate and acuminate; _maxillary palpi_ four-jointed, rather short, the joints subequal and subclavate, but the second is both the most robust and slightly the longest. THORAX oval or globose; _prothorax_ inconspicuous; _scutellum_ lunulate and convex; _post-scutellum_ transverse and linear; the _metathorax_ abruptly truncated; _wings_ with two submarginal cells, and a third distinctly commenced, the second the longest, and receiving both the recurrent nervures, the first towards its centre and the second near its termination; _legs_ moderate, setose, the plantæ of all with a dense brush beneath; _claw-joint_ longer than the three preceding; _claws_ simple. ABDOMEN short, cylindrical, convex, the terminal segment slightly pointed, the ventral segments densely pilose in parallel lines from the second. The MALE differs in having the _antennæ_ longer and always filiform, the ventral segments very concave, and the terminal dorsal segment variously mucronated, tuberculated, spinose or serrated, and the claws bifid. NATIVE SPECIES.