188 NEUROPTERA OF NORTH AMERICA. 



1. S. infumata ! 



Sialis infumatus Newm. ! Entom. Mag. V, 500; Walk. Catal. 195, 2. 



Black, head not narrowed posteriorly, a little narrower than the 

 prothorax, the occiput with flat streaks and spots, which are fer- 

 ruginous and somewhat shining ; antennae rather slender ; anterior 

 angles of the prothorax rounded, the sides with impressed points ; 

 feet black; wings black, the veins thick and blacker. 



Length to tip of wings 12 15 millim. Alar expanse 22 26 

 millim. 



Hob. Arctic America (Richardson); Nova Scotia (Redman); 

 St. Martin's Falls, Albany River, Hudson's Bay (Barnston) ; Tren- 

 ton Falls, New York; Washington, in May (Osten Sacken); Bal- 

 timore, Maryland; Pennsylvania (Uhler). 



A variety has the head spotted beneath with yellow; or the pro- 

 thorax spotted with black : is it a different species ? 



2. S. americana! 



Semblis americanus Ramb. ! Neuropt. 447, 1. Sialis ferrugineus Walk. ! 

 Catal. 195, 3. 



Ferruginous; head narrower behind, occiput with streaks and 

 spots, which are flat, somewhat shining, and surrounded with black ; 

 prothorax a little narrower, the anterior angles square, the sides 

 with yellowish, impressed punctures ; antennae black ; feet fuscous, 

 femora ferruginous ; wings pale ferruginous, the veins darker ferru- 

 ginous. 



Length to tip of wings 12 14 millim. Alar expanse 24 26 

 millim. 



Hob. Georgia (Abbot) ; Pennsylvania. 



3. 8. bifasciata ! 



Sialis bifasciata Hagen ! 



Ferruginous; head not narrowed posteriorly, orange-colored, 

 two broad black stripes, the occiput with flat streaks and spots, 

 which are somewhat shining, orange ; antennae stout, black, pilose; 

 anterior angles of the thorax obtuse, orange, each side with a broad, 

 fuscous stripe and flat points, somewhat shining, orange ; feet fus- 

 cous, femora yellowish, with the base fuscous ; wings pale fuscous, 

 somewhat shining, anterior ones obscurer upon the costal margin, 

 the veins pale fuscous. 



