MAY FLIES AND MIDGES OF NEW YORK 209 



conspicuous in tlie living specimen and much branclied, the setae 

 markings upon the dorsum of each abdominal segment as is 

 shown in lig.16; the seventh and eighth segments are entirely 

 without, and the sixth usually has but few, setae. The posterior 

 marcrin of tlie second has the usual black longitudinally ridged 

 fascia The lateral fin of the eighth segment, together with the 

 terminal spur, are shown in flg.17. The caudal paddle is fringed 

 with long, pale, delicate, matted hairs. 



Imago, male. Body gray, with two large white spots on each 

 side of the chest ; abdomen fringed with hairs on each side, and 

 haviiio- a white silvery band on the hind border of each segment; 

 feelers black; legs black, hairy, a yellow ring near the tip of each 

 thio-h and two yellow rings round each shank; feet dull yellow 

 to^^^lrds the base; wings colorless, with the usual dark spot on 

 each; veins pale brown; poisers gray. Length of body 5.5 mm., 

 of the wings, 10 mm. St Martin's falls, Albany river, Hudson 

 bay. Walker, loc. cit. 



At the head of the division to which this species belongs, 

 Walker states that the wings are hairy. This, however, is evi- 

 dently an error. To the above description the following may be 

 added. 



Male. Head and occiput black, proboscis and palpi dull black, 

 the former with dark brown hairs. Antennae brownish yellow, 

 the large basal joint black, the hairs dark brown. Thorax wholly 

 black, the dorsum and the scutellum with cinereous bloom, the 

 former with three cinereous stripes, the middle one divided by a 

 fine black line, the hairs pale brown. Abdomen velvet black, the 

 posterior margin of each segment dorsally with a moderately 

 wide white fascia extending to lateral margins. When viewed 

 from behind, the last three or four segments appear to me mot- 

 tled with cinereous, leaving a black median line on the fifth and 

 sixth segments. Venter dull black; genitalia brownish yellow, 

 moderately long (pl.32, fig.7). Abdomen sparsely covered with 

 long, nearly erect, yellowish hairs. Coxae brownish black, 

 moderately shining; 'femora brown, excepting the yellow basal 

 articulation and a vellow subapical ring; tibiae cream white, with 

 brown base and tip ; the brown of the front pair quite pale, the 

 hind pair having in addition a median ring which is sometimes, 

 indistinct. In some specimens the basal half of fore tibiae is also 

 brown. Tarsi cream white, tlie tips of all joints and the whole 

 of the fifth brown, the brown of the fore pair being quite pale. 

 The anterior tarsi are delicatelv iM^irdod. The anterior meta- 

 tarsus about one fifth longer than its tibia. Wings hyaline, cross- 

 vein dark brown; venation as figured. Halteres brownisli yellow 

 with apical half of the knob dark brown. 



