56 AMERICAN BLACK FLIES OE BUFFALO GNATS. 



ones, most numerous on lateral margins; face as broad as frons at 

 center, slight^ longer than broad, the surface hairs yellowish white; 

 palpi black haired; postocular cilia white and black intermixed, 

 the black hairs strongest. Scutum with yellowish white, regular, 

 hairlike pilosity, anterior angles with short intermixed black hairs, 

 posterior fourth with distinct, long, black, upright hairs; pleural 

 tuft Avhitish; post-spiracular area haired; scutellum with whitish 

 pilosity and upright black hairs. Abdominal basal scale opaque 

 black, fringe pale, whitish; surface hairs on abdomen short, pale 

 yellow or whitish. Legs with whitish pilosity and some upright 

 black hairs, which are most noticeable on dorsal surfaces and tarsal 

 joints, the paired apical fore tarsal hairs not so conspicuous as in 

 venustxm and its allies; tarsal claws simple (PI. II, fig. 10). 



Length, 3-4 mm. 



One female from Ithaca, N. Y., September 2, 1888 (Dr. L. O. 

 Howard), and three reared females from Rosslyn, Va., October 5, 

 1912 (J. R. Malloch), are in the collection. I have also seen larval, 

 pupal, and adult material from South Carolina (Jennings and King). 



3/ ale. — Opaque velvety black. Basal two joints of antennae 

 slightly yellowish. Scutum with anterior angles and lateral and 

 posterior margins broadly white-pollinose ; sometimes there are two 

 small spots on the anterior margin, nearer the center than the large 

 patches on anterior angles of scutum behind jDrescutum, and in 

 some specimens there are also two central faint whitish longitudinal 

 stripes; pleurae whitish dusted^ postscutum with silky, white j)olli- 

 nosity. Abdomen with first segment under basal scale and sides of 

 fourth to seventh silvered. Legs black, the knees and base of hind 

 metatarsus more or less distinctly yellowish. Wings clear; thick 

 veins brown. Halteres yellow. 



Hairs on face and palpi brown, postocular cilia brown ; pilosity on 

 thorax yellow and hairlike, short on disk of scutum, longer anteriorly, 

 laterally, and posteriorly, and with a few black, upright hairs inter- 

 mixed on posterior fourth; pleural tuft pale brown; scutellum with 

 yellow pilosity and long, upright, brown hairs. Basal abdominal 

 fringe brownish yellow, surface hairs on abdomen brown. Legs 

 with yellow pilosity, which is most noticeable on femora and tibial, 

 and long, upright, dorsal, black hairs, the paired fore tarsal hairs 

 present on joints 1-3; fore tarsus not thickened, hind tarsus with 

 basal joint narrower than thickest portion of hind tibia?; claws trifid. 

 Size and venation as in female. 



There are a number of specimens before me from Ithaca, X. Y. 

 (Dr. L. O. Howard), most of which have the anterior punctiform 

 marks and dorso-central stripes distinct. The localities for the other 

 specimens in the collection are Rosslyn, Va. (F. Knab), one reared 



