165. LONCHOEA ? PUNCTIPENNIS. _Foem._ Nigra, nitens, capite antico argenteo, antennarum articulo 3° longe-conico, arista plumosa, tarsis halteribusque piceis, alis cinereis basi nigris puncto costali nigro. _Female._ Black, shining, with several stout bristles; head silvery in front; face flat; antennæ short; third joint elongate-conical, arista very plumose; abdomen oval, convex, a little shorter and narrower than the thorax; tarsi and halteres piceous; wings grey, black at the base, with a black costal point at the tip of the subcostal vein; veins yellowish, black at the base; costal vein black; discal transverse vein straight, upright, parted by less than its length from the border, and by nearly twice its length from the præbrachial transverse. Length of the body 2-1/4 lines; of the wings 4-1/2 lines. 166. LONCHOEA? CONSENTANEA, n. s. _Foem._ Nigra, nitens, arista nuda, abdomine cyanescente-nigro, alis cinereis, halteribus albis. _Female._ Black, shining; antennæ black, nearly reaching the epistoma; 3rd joint linear, about thrice the length of the 2nd; arista simple; abdomen bluish black; wings grey; veins black, testaceous at the base; discal transverse vein straight, upright, parted by less than its length from the border and by more than twice its length from the præbrachial transverse; halteres white. Length of the body 2 lines; of the wings 3-1/2 lines. 167. LONCHOEA? ATRATULA, n. s. _Foem._ Atra, pubescens, antennis epistoma attingentibus, arista plumosa, abdomine subovato, alis nigricantibus. _Female._ Deep black, pubescent, not shining; antennæ; reaching the epistoma; 3rd joint linear, rounded at the tip, about four times the length of the 2nd; arista plumose; abdomen somewhat oval, a little broader but hardly longer than the thorax; wings blackish; veins black; discal transverse vein straight, upright, parted by less than its length from the border, and by about twice its length from the præbrachial transverse. Length of the body 2 lines; of the wings 3-1/2 lines. Gen. THRESSA, n. g. _Foem. Corpus_ breve, crassum. _Caput_ thorace multo latius. _Oculi_ magni. _Antennæ_ epistoma fere attingentes; articulus 3^{us} linearis, 2° plus duplo longior; arista plumosa. _Abdomen_ subovatum, thorace non longius. _Pedes_ longiusculi. _Alæ_ parvæ. _Female._ Body short, thick. Head much broader than the thorax; front wide. Eyes large. Antennæ nearly reaching the epistoma; 3rd joint linear, rounded at the tip, more than twice the length of the 2nd; arista plumose. Thorax a little longer than broad; scutellum rather prominent. Abdomen nearly oval, not longer than the thorax. Legs rather short. Wings small; costal vein ending at the tip of the wing; radial vein very near the costa; cubital vein ending at a little in front of the tip; transverse veins much retracted, very short.