MAY FLIES AND MIDGES OF NEW YORK 139 



resembles T. n e b u 1 o s u s (an European species) but is a little 

 smaller, the abdomen is not annulate, the incisures only being 

 narrowly pallid, and the wings are white, uniformly fuscous 

 spotted, hairy. Greenland. (Staeger and Lundbeck.) 



T. n e b u 1 o s u s mentioned above is a grayish brown fly 

 about 7 mm. long, with striped thorax and banded abdomen; 

 legs reddish yellow, the tibiae with dark tips and the tarsi 

 dusky; wings hairy, clouded; the fork of the cubitus sessile: 



The description of Tanypus decedens Walker p.22. 

 (1848) is as follows: This species resembles T. nebulosus 

 Meigen, but the spots of the wings are much fainter and the tips 

 of the thighs and of the shanks are not dark. Length of the body, 

 4 mm. Of the wings 10 mm. St. Martin's Falls, Albany River, 

 Hudson Bay Ter. 



2. Ablabesmyia bifasciata Coquillett 

 1901 Tanypus Coq. Proe. U. S. Nat. Mus. 23:609 



Male. Differs from johnsoni (see number 11) as follows : Front 

 corners of scutellum brown, apical joint of tarsi white, no brown 

 band on femora, nor on tibiae, brown of aibdoinen confined to a 

 fascia at base of segments 2 to 6 and middle of dorsum of seventh, 

 (front tarsi wanting), hairs of wings chiefly brown, humeral 

 crossvein not bordered with brown, the first fascia lies beyond the 

 small crossvein; length, 4 mm. 



Female. Hairs of antennae whitish, abdomen yellow, destitute 

 of brown markings, otherwise as in the male. Length 2.5 mm. A 

 specimen of each sex. 



Habitat. Riverton, N. J. (C. W. Johnson) ; Pennsylvania; and 

 Boston, Mass. 



3. Ablabesmyia futilis Van der Wulp 

 1868 Tanypus Wulp. Tijd. v. Ent. ser.2. 2 (X), 130 



Fuscons; the abdomen white and fuscous annulate; scutellum, 

 legs and halteres pale yellow; wings pilose, clouded and spotted; 

 fork of the cubitus sessile. Male; leng-th, .3mm. 



Male. The head is dark brown, on the eye margins with a paler 

 sheen ; proboscis and palpi brown ; antennae with its hairs yellow- 

 ish brown. The thorax moderately arched, dark brown, the ante- 

 rior margin, the humeri, and a pair of longitudinal stripes upon the 

 dorsum with a whitish sheen; scutellum whitish yellow; meta- 

 notum blackish. Abdomen transparent whitish, with a broad 

 brown posterior margin on each segment and a blackish brown 

 interrupted longitudinal dorsal stripe; the last segment wholly 

 darkened, somewhat flattened, the last two segments a little broad- 



