448 NEW YORK STATE MUSEUM 
c¢ The proximal cross vein between R,; and Rs op- 
posite the proximal cross veins between Rs 
and M; fore wings rarely with more than two 
accessory veins arising from R3:; cheeks yel- 
POWAY GS sco ae we gee pana woe eee Reger oie otis eee linfumate2 
ce The proximal cross veins between R, and R; 
distinctly distad of the proximal cross vein 
between R, and M, and which is generally 
opposite the first fork of media; fore wing 
never with less than three accessory veins 
arising from, ‘Rez cheeks black. < 0.42262 eee 2fuliginosa 
bb Head black in front with a broad orange band 
belinda «sors. y ve ar, eaten Ata seinen acer), 4 3 nevadensis. 
-aa@ Body either black or ferruginous. wings pale fer- 
ruginous, or pale fuscous 
6b Head black in front, with broad orange band 
behind: body black oo. ees Ge Bale ee eee 4morrisoni 
bb Head yellow. orange, or reddish, with or without 
dark markings; body never quite black 
c Front of head without dark stripes............ d5americana 
ce Front of head marked with black stripes, or 
suffused with fuscous 
d Antennae stout, head with two black stripes; 
femora yellowish; eyes normal............ 6 bifasciata 
dd Antennae Slender; head with a long median 
line, suffused with fuscous in front; femora 
blackish fuscous; eyes unusually prominent 7 chilensis-. 
DESCRIPTION AND GEOGRAPHIC RANGE OF SPECIES 
1 S. infumata Newman 
18388 Sialisinfumata Newman, Ent, Mag. 5:500 
1853 Sialis infumata Walker, Cat. Brit. Mus. Neur. p.195 
1861 Sialisinfumata Hagen, Synopsis Neur. N. Am. p.188 
18638 Sialis infumata Hagen, Ent. Soe. Phila. Proc. 2:181 
1863 Sialisinfumata Walsh, Ent. Soc. Phila. Proc. 2:261 
1892 Sialis infumata Banks, Am. Ent. Soc. Trans. 19:357 
1897 Sialis concava Banks, Am. Ent. Soc. Trans. 24:22 
1901 Sialis infumata Needham, N. Y. State Mus. Bul. 47, p.542,. 
pl.29 
Black; head a little narrower than the prothorax, but not 
narrowed posteriorly, between the eyes convex to concave, caudal 
half of head with ferruginous and shining streaks and spots,. 
similar spots between the eyes, more or less conspicuous; an- 
tennae black, rather slender; prothorax rounded on the anterior 
angles, the sides of dorsal aspect with a few impressed points;. 
legs and feet black; wings nearly black, the veins thick and 
