MAY FLIES AND MIDGES OF NEW YORK 179 



:as long as the head. Thorax, scutellum, and abdomen black, 

 opaque gray pruinose, the sparse hairs chiefly yellow. Wings 

 1.5 times as long as the abdomen, whitish hyaline, veins yellow 

 or brownish; the third, except at its base, the fourth before its 

 point of furcation, also its posterior branch, both branches of the 

 fifth and the whole of the sixth almost colorless ; the crossvein at 

 the outer end of the second basal cell unites with the upper 

 branch of the fifth a short distance beyond its base, and with 

 the fourth a short distance before its furcation; the small 

 crossvein at about twice the length of the outer crossvein 

 beyond the base of the upper branch of the third 1 vein ; the first 

 vein extends to the last fifth of the length of the wing. Legs 

 brownish black, first joint of the front and the hind tarsi two- 

 thirds as long as their tibiae, the fourth joint noticeably widened, 

 about three-fourths as long as the fifth ; tarsal claws simple and 

 of equal length. Halteres yellow. Length 3.5 mm. Bering 

 Island. 



An immature male specimen collected at the same time and 

 place differs from the female in having the palpi, antennae, scutel- 

 lum and the legs yellow. A female collected on the summit of Mt 

 Washington, N. H., by Mrs Annie T. Slosson, does not differ from 

 the female above described. (Coquillett, loc. cit.) 



The description given above of the female would apply very 

 well to Di i a m e s a w a 1 1 1 i i . 



Group Chironomus Meigen 

 Meigen. Illiger's Magazin. 2 : 260. 1803 



The eggs. The eggs of the members of this group are deposited, 

 usually in the water, in the form of a long string or in a clump, 

 surrounded by a layer of gelatine. The arrangement of the eggs 

 within the egg string seems to be constant for a given species 

 (pl.31, figs. 12 to 15). Miall and Hammond (1900) say, "In C. 

 d o r s a 1 i s the egg mass is a transparent cylinder with rounded 

 nds, about 20 mm. long, formed of a mucilage secreted by the 

 gluten-gland, in which the brownish eggs are imbedded. The eggs 

 do not lie at random, in the cylinder, but are lodged in a special 

 winding tube or egg-pipe, which lies near the surface of the egg 

 mass, and makes many almost complete spires, curving around 

 from right to left and from left to right alternately (pl.31, figs. 

 13 and 14). The tube itself only becomes visible when the egg 



should probably read " 4th vein", because in the generic description 

 the third vein is said to be simple ; i. e. unbranched. 



