DESCRIPTIONS OF NEW AND LITTLE KNOWN DIPTERA OR TWO-WINGED FLIES By J. M. Aldrich, Associate Curator, Division of Insects, United States National Museum The following descriptions of new genera and species, with notes on some previously described forms, are based upon material re-ceived from several sources, which are indicated in every case. FAMILY CYRTIDAE Genus OCNAEA Erichson Ocnaea Erichson, Entomographien, 1840, p. 155. — Cole, Trans. Amer. Ent See, vol. 45, 1919, p. 23. OCNAEA FLAVIPES, new species Male. — Head black, almost all included in the eyes, except the back; ocelli two; antennae blackish, the third joint reddish on the median side, deeply grooved on the lateral one, about five times as long as the two preceding taken together; palpi small but distinct, yellow; eyes with long brown pile. Thorax black or very dark brown in ground color, covered with a long pile which is yellow except on the middle of the dorsum, where it is mixed with blackish. Pleurae more brown than black; humeri whitish yellow; the posta-lar ridge extending from the root of the wing to the scutellum i<5 brown. Calypters convex, translucent, with yellow border Basal segment of abdomen brown, mostly concealed, with narrow pale liind border; second segment shining black on the dorsum except a narrow reddish hind border which widens toward the sides to include about half the length of the segment ; third segment with some-what shield-shaped black spot in the middle, not quite reaching the hind edge; fourth segment with a small oval black spot, not quite reaching the front edge and considerably separated from the hind edge; fifth segment with median narrow black stripe extending about two-thirds of its length; sixth segment with indistinct blackish spot in the middle; all the remainder of segments tliree to six is reddish-No. 2648 —Proceedings U. S. National Museum, Vol. 69, Art 22. 3100—26 1 1
BioStor
