MALE, FEMALE. Head red; face in the depression yellow, on the sides with a silvery sheen. Antennae black; first joint red, more than half of the length of the second joint; second joint sometimes reddish at the base; third joint about as long as the second joint, stout; third joint of the style suddenly attenuated into a moderately long bristly extremity. Thorax red; mesonotum with a median black stripe, and an oval, more or less distinct spot on either side; a golden pollinose spot on the inner side of each humerus. Abdomen red, lightly pollinose, the median segments more or less black; ventral process in the female large; the sixth segment in the same sex about as long as the two preceding together. Legs red, the tarsi a little darker, the pulvilli and the ungues, save their black tip, yellow. Wings brown in front, the brown extending to the fifth vein in the basal part of the discal cell; the space behind the spurious vein in the first posterior cell hyaline; the outer part of the same cell subhyaline. Length 16-17 millimeters. Two specimens, Chapada, H. H. Smith. 4. =Conops angustifrons, n. sp.= MALE. Front much longer than wide; black, shining at the vertex and below; an opaque band below the vertical callosity. Antennae black, the third joint somewhat reddish below towards the base; the first joint about half of the length of the third joint; third joint distinctly shorter than the second, rather broad at the base; style small, attenuate. Face, cheeks and the lower part of the occiput wholly light yellow. Thorax opaque black; a whitish pollinose spot on the inner side of each humerus; vertical pleural pollinose spot not distinctly limited above; a row of dorso-pleural, at least two prescutellar, and four scutellar, well-developed bristles. Abdomen subopaque black; second segment yellow at the base; sixth segment opaque golden yellow pollinose. Wings brownish before the third longitudinal vein, the first basal and the first posterior cells wholly hyaline; a streak before the fifth vein. Legs deep brown; the base of all the tibiae, the large pulvilli, and the claws (except their tips) yellow. Length 12 millimeters. One specimen, Chapada, H. H. Smith. This species is peculiar in its narrow front, bristles of the thorax, and hyaline first posterior cell. 5. =Conops nobilis, n. sp.=