AQUATIC INSECTS IN NEW YORK STATE Ott 
S. pecuarum Riley 
U. S. Dep’t Agric. Rep’t for 1886. 1887. p.512 (Coquillett considers this a 
synonym of S.invenustum Walker) 
Plate 338, fig.6—-11 
Female. Length 2.5mm to 4mm. Head uniform Bao slate, 
clothed with short yellowish hair, which becomes longer behind 
the eyes; eyes black, with coppery or brassy reflections; an- 
tennae black, with whitish pubescence, and with a few bristles 
on two basal joints, which are tinged with red, joints 1 to 11 
gradually diminishing in thickness toward the last, joint 1 the 
shortest, joints 2 and 38 twice as long as joint 1, joints 4,5 and 
6 as long as joint 1, joints 7, 8, 9 and i) sradually increasing 
in length, last joint renter, twice as long as joint 10. Max- 
illary palpi a little longer than the antennae, blackish, with 
long grayish bristles. 
Thorax grayish slate, more or less densely covered with short, 
yellow hairs, and with usually very distinct markings, consist- 
ing of two median dorsal, and two subdorsal broad, longitu- 
dinal, sooty black bands, oe which the latter curve to posterior 
-edge of patagium, which is reddish at tip; lateral edges of 
prothorax with fine black sutures; underside of the thorax unl- 
form grayish slate, with sparse yellow hairs, space around the 
one large stigma lighter: halteres opaque, reddish white; legs 
uniform. reddish krown, densely covered with yellowish hairs; 
tips of the tarsi blackish; wings subhyaline; larger veins and 
base reddish brown. | 
Abdomen nine jointed; joints subequal in length except the 
last two, which decrease in length; a longitudinal, broad, bluish 
gray dorsal band extends from near the base of second segment, 
where it is broadest, to the tip curving downward to the anterior 
lateral edge of seventh segment; below this band laterally the 
color is blackish brown, with the exception of a broad bluish gray 
transverse band on the posterior edge of each of the segments 
from 1 to 6; underside of abdomen uniform brownish gray, 
without markings; abdomen densely covered with yellowish 
hair, which is very long upon the posterior edge of segment 1, 
forming an overlapping fringe. 
Male. Length 1.5 to 2.2mm; differs considerably from the 
female. Head not visible from above, being occupied by the very 
large confluent eyes; the remaining parts below the eyes are 
black, with black hairs and bristles; eyes composed of two differ- 
ent nde of facets, those above very large, twice as large as 
those of female, and those in front and surrounding the 
dwarfed trophi very minute, the dividing line between the sizes 
being abrupt; antenna similar to the female, more  pro- 
