Psilopa flavida, n. sp. ♂.—Yellow, polished, the third joint of antennæ, except the lower side, dark brown; hairs and macrochætæ black, a vitta reaching from humerus to insertion of wing, and another on middle of pleura, black; abdomen, except first segment and middle of the second, black, with a strong violaceous tinge; knob of halteres greenish yellow; wings grayish hyaline, unmarked; two pairs of dorso-central mocrochætæ; length 2.5 mm. New Bedford, Mass. A single specimen collected by Dr. Garry de N. Hough. Type No. 4292. U. S. Nat. Museum.