7. Face and cheeks black in ground-color _magnus_, n. sp. Face and cheeks yellow _inornatus_, n. sp. 1. =Conops magnus, n. sp.= FEMALE. Front black, shining, the vertical callosity somewhat reddish. Face and cheeks yellowish brown, the orbits silvery pollinose. Antennae brownish black; second and third joints subequal, first joint about two-thirds the length of the second; third joint of the style with a long bristly extremity. Thorax shining black; pleurae lightly whitish pollinose. Abdomen deep black, opaque; lightly whitish pollinose posteriorly; ventral process of the fifth segment large. Wings deep brown in front, extending through the two basal cells, and the basal part of the discal cell; outer part of the first posterior cell subhyaline, as also behind the streak corresponding to the spurious vein of the Syrphidae. Legs black; base of the femora, of the tibiae, and of the tarsi, somewhat yellowish. Length 21-24 millimeters. Six specimens, Chapada, H. H. Smith. 2. =Conops grandis, n. sp.= FEMALE. Front black, the lower margin of the vertical callosity reddish; just below the callosity opaque, elsewhere shining. Antennae black; the second and third joints of nearly equal length; the first joint about two-thirds the length of the second joint; style with a long bristly extremity. Face and cheeks light yellow, the orbital margins of the former silvery or light golden pollinose. Thorax black, the mesonotum shining, the pleurae lightly whitish pollinose. Abdomen deep black; posteriorly lightly pollinose. Wings brown in front; first posterior cell and the space behind the streak corresponding to the spurious vein of the Syrphidae in the first posterior cell, pure hyaline; outer part of the first posterior cell subhyaline; a brown streak in front of the fifth vein. Legs black; the tibiae and basal joints of the tarsi in large part reddish or yellowish; pulvilli light yellow; ventral process of the fifth segment extraordinarily large; seventh segment as long as the three preceding together. MALE. Abdomen in ground-color black, either wholly so, or more or less, or rarely entirely, red; the ground color, save at the base, however, is almost wholly obscured by reddish brown pollen. Length 19-23 millimeters. Six specimens, Chapada, H. H. Smith. 3. =Conops rufus, n. sp.=