AQUATIC INSECTS IN NEW YORK STATE 44i) 



blacker; K3 of fore wings with rarely more than two simple or 

 forked branches; the proximal cross veins of Ri-R^ and B^-M 

 are opposite. Length to tip of wings 10 to 15 mm ; alar expanse 

 22 to 26 mm. 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. Four- 

 teen specimens in the Harvard collection under this label are 

 apparently males of S. i n f u m a t a . 



A species- of very wide distribution: arctic America, Quebec, 

 Kova Scotia, throughout New England and New York, New Jer- 

 sey, Maryland, Washington D. C, Washington N. C, Ohio, De- 

 troit Mich., Galena and Galesburg 111., Saskatchewan region, in 

 Minnesota at Minneapolis and St Cloud, in California at Lake 

 Tahoe, Placer co., San Geronimo, San Celito. 



2 S. fuliginosa Pictet 



1S36 Si a lis fuliginosa Pictet, Ann. Sci. Nat. pl.3. fig.G 



1839 S i a li s fuliginosa Burmeister, Handb. Ent. 2:947 



I80G Sialis fuliginosa Brauer. Verb. Zool. Bet. Ges. p.397 



1857 Sialis fuliginosa Brauer & Low, Neur. Aust. p.52 



1865 Sialis fuliginosa McLacblan, Ent. Mo. Mag. 2:10Y, fig.l; and 



1866, 3:95 

 1868 Sialis fuliginosa McLacblan, Ent. Soc. Lond. Trans. 1.52:8, 

 fig.2 



This European species, not formerly reported in America, dif- 

 fers from S. i n f u m a t a 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 Ri-Rg is distinctly distad of the proximal cross vein 

 Rg-M, the latter generally opposite the first fork of media. In S. 

 i n f u m a t a the 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 

 R3; these are either simple or forked. 



Six specimens collected by Morrison 1878, Reno Nev., one 

 from Morris county, Cal., two from Mendocino Cal., and two 



