The Neuropteroid Insects of the Canadian Arctic Expedition, 



1913-18. 



By NATHAN BANK>. 



The Neuropteroid insects taken by the Canadian Arctic Expedi t inn. 1913-16, 

 belong to seven species, two of which are herewith described as new. M 

 the specimens collected by Mr. Frits Johansen belong to one species which is 

 common in the Arctic regions. 



PERLIDAE. 



Alloperla pacifica Banks. 



Two from Ketchikan, southern Alaska, September 10, 1916. 



Nemoura, sp. 



Several specimens, quite possibly of a new species, from Bernard harbour. 

 Northwest Territories, June 30, 1916, and July 30, 1916. They arc in poor 

 condition and cannot now be described. 



Capnia nearctica, n. sp. 



Black. Body long and slender. Pronotum plainly broader than long, a 

 little broader behind than in front, with a deep transverse groove in front 

 parallel to the front margin. Wings in the male not reaching one-fourth way 

 to the tip, in the female reaching to the tip of body. Setae about one-half the 

 length of the body. In the male the third segment from the tip has a rather 

 large, rounded, median elevation, the surface of which is deeply pitted and 

 provided with short hairs, and behind over the last two segments is a median 

 groove bordered by nearly parallel elevated ridges; in the posterior part the 

 ridges swell out a little; the groove is fully two and a half times as long as 

 broad. 



Length, 6 mm. 



Many specimens from Bernard harbour, Northwest Territories, Canadian 

 Arctic Expedition, June 25, 1915 (F. Johansen, coll.). Type in Canadian 

 National Collection of Insects, Ottawa, paratype in Museum of Comparative 

 Zoology, Cambridge, Mass. Differs from other species in the shape and 

 sculpture of the tubercle near tip of body. 



TRICHOPTERA. 



Rhyacophila alberta Banks. 



One from Ketchikan, southern Alaska, September 10, 1916. 

 Chilostigma praeterita Walker. 



Many specimens. All taken at Bernard harbour, Northwest Territories, 

 September 23, 1915. There is much variation in the extent of the markings 

 on the front wings almost uniformly dark-coloured. Described from Canada. 

 I have seen it from several northern localities and it also occurs in the more 

 northern parts of Europe. 



