AQUATIC INSECTS IN NEW YORK STATE 407 
claws. Wings with brown scales, a quadrangular patch of yel- 
low scales just proximad of the fork of R, and R, covering a 
short section of both R, and the costal vein; an oblique patch 
at tip of R,, crossing the media, leaving the tips black of all 
excepting R,; a few scattered pale yellow patches of scales else- 
where; and the posterior margin brown scaled, with patches of 
white ones at the tip of Cu,. Halteres pale yellow at base, 
the knob infuscated. Length 3 to 5 mm, exclusive of antennae 
and wings. | 
Female. Brown, as with the male; abdomen more uniformly 
brown, covered with nearly erect, fine, yellow hairs; scutellum 
and metathcrax with a fine dark line; tarsal claws all simple; 
wings as with the male but wider in proportion to the length; 
venation as in figure 5; the basal section of R,4+; distad of the 
R-M cross vein, as the male. Everything else as in the male. 
Length 4 to 6 mm. 
Larva. Three regions may be distinguished in the larva, viz 
he head, thorax and abdomen. The head is rounded, brown in 
color, and completely chitinized; the eyes are situated laterally 
and seem to be of two kinds; one is compact and more or 
less circular in outline, the other, visible only in older larvae, is 
a crescentlike body compounded of ommatidia-primordia of 
adult eyes. On a level with the eyes and cephalad of them are 
the antennae, and a trifle caudad of the base of these on the 
dorsal surface, arranged in a transverse row, are six feathered 
hairs. These are not placed on a band of pigment as is said 
to be the case with maculipennis. Between the base of 
the antennae and the base of the maxillary palpi, om a chitin- 
ized prominence, is a conspicuous branched hair. Near the tip 
on the dorsal surface of the labrum are two simple hairs pro- 
jecting forward; these are more caudad than in maculipen- 
nis. Back of the transverse row of feathered hairs is another 
transverse row composed of four small feathered hairs; between 
the latter are usually nine more or less distinct pigment spots, 
the largest in the center, the others arranged around it. At the 
extreme cephalic end, at each side of the labrum, is a dense 
brush of brown hairs; another smaller brush is at the tip of the 
labrum and on the ventral surface of the labrum are several tiny 
tufts of hairs just in front of the mouth opening. The piece 
which carries the tufts on the sides of the labrum is called the 
scutum of the second metamere or clypeus. The antennae are 
two jointed, the first short and apparently immovable; the 
second elongate, free, bearing two rather long spines and two 
short ones, and a six branched hair, (Nuttall shows four in 
maculipennis). About one third of its length from the 
