_Male and Female._ Deep black, shining, short, broad. Head testaceous, face transverse; antennae testaceous, third joint elongate-conical; arista bare; abdomen blackish blue, second segment very large, third and following not visible; legs testaceous; wings limpid, with four transverse pale brown subcostal streaks; discal transverse vein parted by less than half its length from the border, and by less than its length from the flexure of the praebrachial; halteres testaceous. Length of the body 2--2-1/2 lines; of the wings 4-1/2 lines. 126. LAMPROGASTER TETYROIDES, n. s. _Mas._ Atra, nitens, brevissima, latissima; capite transverso, subruguloso; thorace scitissime punctato; abdomine cyaneo; tarsis flavis; alis nigris albido punctatis apud marginem posticum obscure cinereis. _Male._ Deep black, shining, very short and broad. Head transverse, slightly rugulose; third joint of the antennae conical; arista thinly plumose; thorax very finely punctured; scutellum almost semicircular; abdomen blue, smooth; tarsi yellow; wings black, dark grey towards the hind border, with whitish points towards the costa; discal transverse vein parted by about its length from the border and by more than its length from the praebrachial transverse. Length of the body 2-1/2 lines; of the wings 5 lines. Gen. PLATYSTOMA, _Latr._ 127. PLATYSTOMA FUSIFACIES, n. s. _Mas et Foem._ Cinerea; capite postice et apud oculos albo; vertice pallide luteo (mas) aut rufo (foem.); facie plana, fusiformi, subargentea; antennis piceis; thoracis vittis tribus pectoreque canis; abdomine conico punctis albis; alis limpidis, guttis transversis interioribus fasciisque exterioribus nigricantibus. _Male and Female._ Cinereous. Head white hindward and about the eyes, black and shining towards the mouth; vertex pale luteous in the male, red in the female; face flat, fusiform, somewhat silvery; antennae piceous, third joint long, slender, linear, arista plumose; thorax with three hoary stripes, the middle one much broader than the lateral pair; pectus hoary; abdomen conical, with numerous white points; wings limpid, with blackish dots towards the base, and with four exterior blackish bands, two of which are dilated towards the costa, and there contain some limpid dots; veins black, discal transverse vein straight, parted by about one-fourth of its length from the border, and by more than its length from the praebrachial transverse; halteres whitish. Length of the body 3-1/2-5 lines; of the wings 8-10 lines. 128. PLATYSTOMA MULTIVITTA, n. s. _Mas._ Cinerea; capite postice et apud oculos albo, vertice luteo, facie et antennis fulvis; thoracis vittis octo pectoreque canis; abdominis segmentis cano fasciatis; ventre ferrugineo; pedibus nigris; alis limpidis, fasciis quatuor strigisque interioribus nigricantibus.