448 NEW TOKK STATE MUSEUM 



c The proximal cross vein between Ki and Bs op- 

 posite the proximal cross veins between Rs 

 and M; fore wings rarely with more than two 

 accessory veins arising from K3; cheeks yel- 

 lowish 1 infumata 



oc The proximal cross veins between Kx ^^^ ^^ 

 distinctly distad of the proximal cross vein 

 between Rs and M, and which is generally 

 opposite the first fork of media; fore wing 

 never with less than three accessory veins 



arising from K3 ; cheeks black 2fuliginosa 



66 Head black in front with a broad orange band 



behind 3 nevadensis- 



aa Body either black or ferruginous, wings pale fer- 

 ruginous, or pale fuscous 

 6 Head black in front, with broad orange band 



behind; body black 4 m o r r i s o n i 



66 Head yellow, orange, or reddish, with or without 

 dark markings; body never quite black 



c Front of head without dark stripes Samericana 



CO Front of head marked with black stripes, or 

 suffused with fuscous 

 d Antennae stout, head with two black stripes; 



femora yellowish; eyes normal 6bifasciata 



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 jSTewman 



1838 Sialis infumata Newman, Bnt. Mag. 5:500 

 1853 Sialis infumata Walker, Cat. Brit. Mus. Neur. p.l95 

 1861 Sialis infumata Hagen, Synopsis Neur. N. Am. p.l88 

 1863 Sialis infumata Hagen, Bnt Soc. Phila. Proc. 2:181 

 1863 Sialis infumata 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. Bui. 47, p.542,. 

 pi. 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 ands 



