_Male._ Testaceous. Head with a black dot above the antennae and one on each side of the epistoma; thorax with the fore part of the disk black, and with two hindward black stripes; fore tibiae and fore tarsi piceous; hind tibiae somewhat piceous; wings slightly brownish, with two blackish bands, the first on the praebrachial transverse vein, abbreviated hindward, the second on the discal transverse vein, abbreviated in front, intermediate space limpid, veins testaceous, black towards the tips; halteres pale testaceous. Length of the body 4-1/2 lines; of the wings 8 lines. Gen. ORTALIS, _Fallen_. 140. ORTALIS PROMPTA, n. s. _Foem._ Nigro-viridis; capite piceo apud oculos albido; antennis rufescentibus; thorace vitta abdomineque fasciis cinereis; pedibus nigris; alis limpidis, vittis tribus nigris, prima postice abbreviata, secunda tertiaque latis; halteribus albidis. _Female._ Blackish green. Head piceous, whitish about the eyes; epistoma somewhat prominent; antennae reddish, third joint somewhat lanceolate, piceous towards the tip; arista bare; thorax with a cinereous stripe; sides and pectus also cinereous; abdomen with two cinereous bands; legs black; wings limpid white, slightly cinereous towards the base, with three black bands, the first abbreviated hindward, the second and third very broad; veins black, discal transverse vein curved inward, parted by much less than its length from the border and by a little less than its length from the praebrachial transverse; halteres whitish. Length of the body 3-1/2 lines; of the wings 6 lines. 141. ORTALIS COMPLENS, n. s. _Mas et Foem._ Nigro-viridis; capite antennisque testaceis, articulo tertio brevi, arista plumosa; abdomine atro; pedibus testaceis, femoribus nigris; alis albo limpidis, strigis duabus apiceque nigro-cinereis, fasciis tribus satis nigricantibus; halteribus albis. _Mas._ Vertice luteo postice nigro, femoribus apice testaceis, alarum fasciis subconnexis. _Foem._ Vertice nigro, tibiis nigris, posticis basi testaceis. _Male and Female._ Blackish green. Head testaceous; antennae testaceous, third joint short, conical; arista plumose; abdomen deep black; legs testaceous; femora black; wings limpid white, with three broad blackish stripes, the second emitting a branch from its outer side to the costa, a streak connected with the outer side of the third band, and the tips blackish cinereous; discal transverse vein straight, parted by much less than its length from the border, and by a little more than its length from the praebrachial transverse; halteres white. _Male._ Vertex luteous, black hindward; femora with testaceous tips; bands of the wings partly connected. _Female._ Vertex black; tibiae black, the hind pair testaceous towards the base. Length of the body 1-1/2--2 lines; of the wings 3-4 lines. Gen. TRYPETA, _Meigen_.