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 



