450 NEW YORK STATE MUSEUltl 



from Webber lake, Cal., agree with this characterization, and are 

 like the European specimens in the Museum of Comparative 



Zoology. 



3 S. nevadensis n. sp. 



Body black; head not narrowed behind, black with orange 

 band clear across the caudal half and reaching around under the 

 eyes to the antennae, smooth streaks and spots of the same color 

 in the orange band above, no such spots between the antennae; 

 eyes black; prothorax hardly narrower than the head, black, 

 not at all marked with the orange color, anterior angles obtuse; 

 antennae black, very slender; feet and legs black; legs pilose; 

 wings black, translucent, either shining or dull, veins darker if 

 possible; Sc-Rj cross veins only one or two; R3 with two simple 

 •or forked branches. Length to tip of wings 18 to 25 mm; alar 

 expanse 38 to 40 mm. 



Collected by Morrison at Eeno Nev., 1878. In Nevada county, 

 Cal., June 12, 1880, said to be " very injurious to grapevine," or 

 " injuring grape leaves." Types in United States National Mu- 

 seum catalogue no, 5177. 



4 S. morrisoni n. sp. 



Body black; head and thorax shaped and marked as in S. 

 nevadensis ; legs and feet ferruginous; wings ferruginous, 

 veins hardly darker; venation as in that species. Length to tip 

 of wings 20mm; alar expanse 40mm. 



Collected by Morrison, Reno Nev., 1878. Type in Museum of 

 Comparative Zoology. 



5 S, americana Rambur 



1842 Semblis americana Rambur, Hist. Nat. Neur. p.447 

 1853 Sialis ferrugineus Wallier, Cat. Brit. Mus. Neur. p.l95 

 1861 Sialis americana Hagen, Synopsis Neur. N. Am. p. 188 

 1892 Sialis americana Banks, Am. Ent. Soc. Trans. 19:357 



General color ferruginous; head narrower behind; eyes black; 

 •caudal half of head with flat streaks and spots shining and sur- 

 rounded with ferruginous; antennae ferruginous; anterior 

 angles of prothorax square; prothorax a little narrower than 

 the head, sides with yellowish impressed punctures; femora fer- 

 ruginous; feet fuscous; wings pale ferruginous, the veins 



