_Female._ Cinereous black; head black, shining; antennæ short, dark red, 3rd joint conical, longer than the 2nd, arista thinly plumose; sides of the pectus with minute whitish speckles; abdomen elliptical, flat, black, shining, longer than the thorax; legs black; wings grey, with an irregular blackish band which does not extend to the hind border, and with a blackish apical spot; veins black; discal transverse vein straight, oblique, parted by much less than its length from the border, and by very much more than its length from the præbrachial transverse, which is clouded with black; halteres white. Length of the body 2 lines; of the wings 3 lines. Gen. NOMBA, n. g. _Mas et Foem. Corpus_ latum, crassum. _Frons_ lata. _Antennæ_ brevissimæ; articulus 3^{us} subrotundus; arista subpubescens. _Thorax_ subpubescens, quasi coriaceus; scutellum parvum; metathorax maximus, abdomen alasque incumbentes obtegens. _Pedes_ breves, robusti; femora subincrassata; tibiæ arcuatæ. _Alæ_ parvæ. _Male and Female._ Body broad, thick, compact. Head almost as broad as the thorax; front broad, narrower than the epistoma; face vertical. Antennæ very short; third joint nearly round; arista very minutely pubescent. Thorax solid, apparently horny, very minutely pubescent; scutellum small; metathorax elliptical, enormously developed, covering the whole abdomen, sheltering the wings when in repose. Legs short, stout; femora slightly incrassated; tibiæ curved. Wings concealed beneath the metathorax. 231. _Nomba tecta_, n. s. _Mas et Foem._ Nigra, obscura, antennis piceis, tarsis flavis apice nigris, alis cinereis. _Male and Female._ Black, dull; antennæ piceous; tarsi yellow, with black tips; wings grey; veins black. Length of the body 1-1/2-1-3/4 line; of the wings 2-1/2-3 lines. Subfam. HYDROMYZIDES, _Haliday_. Gen. NOTIPHILA, _Fallen_. 232. NOTIPHILA LINEOSA, n. s. _Mas et Foem._ Fusca, obscura, capite apud oculos linea frontali et epistomate albidis, arista plumosa, thorace lineis sex albidis abdomine nigro segmentorum marginibus fulvis, pedibus nigris, tibiis anticis genubus tarsis halteribusque fulvis, alis cinereis. _Male and Female._ Brown, dull; head whitish about the eyes, and with a whitish line on the front; epistoma whitish; antennæ not near reaching the epistoma, 3rd joint elongate, arista thinly plumose; thorax with six whitish lines, the lateral pair incomplete; abdomen black, not longer than the thorax, hind borders of the segments tawny; legs black, tarsi, knees, posterior tibiæ at the tips, and fore tibiæ tawny; wings grey; veins black; discal transverse vein straight, upright, parted by more than its length from the border, and by full thrice its length from the præbrachial transverse; halteres tawny. Length of the body 1-3/4-2 lines; of the wings 3-1/2-4 lines. The two following species belong to the group of which _N. Cinerea_ is the type.