FEMALE. Head black; front, below the vertical callosity, except a crescentic space above the base of the antennae, opaque; face, on the sides and in the depression, with a conspicuous, light yellowish silvery reflection; in an oblique light from above the ground-color wholly concealed. Antennae black; the reddish first joint about two-thirds the length of the third joint; the third joint about two-thirds of the length of the slender second joint; third joint of the style with a short bristly extremity. Thorax black, lightly pollinose, opaque; on the front margin, and near the humeri, velvety; in the middle in front distinctly whitish when seen from behind. Abdomen black, subshining; second segment deep opaque black, save on the anterior part, where it is whitish pollinose; ventral process of the fifth segment small. Legs black; the tarsi and claws (save their extreme tips) light yellow; pulvilli very large, yellow; the tarsi dilated. Wings unequally brown in front, scarcely extending beyond the third vein, save in the first posterior cell; the costal cell and the outer part of the wing in front of the third vein of a lighter color. Length 12 millimeters. One specimen, Chapada, H. H. Smith. 6. =Conops inornatus, n. sp.= MALE. Front black, shining, the vertical callosity reddish. Face yellow, with golden pollen on the sides extending up on the lower part of the front. Cheeks wholly yellow. Thorax black, shining, lightly pollinose; margins of the thorax and of the scutellum with moderately large bristles. Abdomen slender, black, shining; the narrow hind margins of the third and fourth segments, the fifth on the sides and behind, and the sixth nearly wholly, light golden pollinose. Legs brown; base of tibiae yellow; basal joints of the tarsi yellowish. Wings subhyaline, without distinct picture, though the color is more intense in front; yellow in the costal cell. FEMALE. Wings distinctly brown before the third vein and in the basal cells and proximal portion of the discal cell. Abdomen diffusely whitish pollinose behind; the second segment largely reddish; ventral process of the fifth segment small. Length 10 millimeters. Two specimens, Chapada, H. H. Smith. 7. =Conops ornatus, n. sp.=