AQUATIC INSECTS IN NEW YORK STATE 44% 
blacker; R, of fore wings with rarely more than two simple or 
forked branches; the proximal cross veins of R,-R, and R,-M 
are opposite. Length to tip of wings 10 to 15 mm; alar expanse 
22 to 26mm. Males are the smaller. 
S.concava Banks was said to differ in being always con- 
cave between the eyes. This, however, is not a constant character 
as shown by an examination of hundreds of specimens. YFour- 
teen specimens in the Harvard collection under this label are . 
apparently males of 8. i nfumata. . 
A species of very wide distribution: arctic America, Quebec, 
Nova Scotia, throughout New England and New York, New Jer- 
sey, Maryland, Washington D. C., Washington N. C., Ohio, De- 
troit Mich., Galena and Galesburg Ill., Saskatchewan region, in 
Minnesota at Minneapolis and St Cloud, in California at Lake. 
Tahoe, Placer co., San Geronimo, San Celito. 
2 S. fuliginosa Pictet 
18386 Sialis fuliginosa Pictet, Ann. Sci. Nat. pl.3, fig.6 
18389 Sialis fuliginosa Burmeister, Handb. Ent. 2:947 
1856 Sialis fuliginosa Brauer, Verh. Zool. Bot. Ges. p.397 
1857 Sialis fuliginosa Brauer & Low, Neur. Aust. p.52 
1865 Sialis fuliginosa McLachlan, Ent. Mo. Mag. 2:107, fig.1; and 
1866, 3:95 
1868 Sialis fuliginosa McLachlan, Ent. Soc. Lond. Trans. 152:8, 
fig.2 
This European species, not formerly reported in America, dif- 
fers from S.infumata in several points: larger, the alar ex- 
panse of the female being 38mm and the three brown spots be- 
tween the antennae relatively much larger; much more densely 
pilose throughout, even slightly so on the hind wings; compound 
eyes ferruginous with several black spots or areas; the proximal 
cross vein R,-R, is distinctly distad of the proximal cross vein 
K,-M, the latter generally opposite the first fork of media. InS8. 
infumatathe yellow infusion around the eyes is usually quite 
distinct, while in S. fuliginosa it is much less so. Fore 
wings never with less than three accessory veins arising from 
R,; these are either simple or forked. 
Six specimens collected by Morrison 1878, Reno Ney., one 
from Morris county, Cal., two from Mendocino Cal., and two 
