PLECOPTERA OE NORTH AMERICA 235 



lightly infuscated ; in both front and hind wings radial 

 sector and media arise from arculus ; venation as in figure 

 5, plate 32. 



Abdomen brown ; cerci composed of single segments. 



Male. Supra-anal plate short, upcurved ; subgenital 

 plate moderately long ; ventral lobe present. 



Female. Eighth abdominal sternite not prolonged into 

 a distinct subgenital plate. 



Genotype, Perlomyia collaris Bks. 



Perlomyia collaris Banks. 



(Plate 43, fig. 6.) 



1906. Perlomyia collaris Banks, Can. Ent., 38:338. 



1907. Perlomyia collaris Banks, Cat. Neurop., p. 14. 



Length to tip of wings, 5 13 mm. Expanse, 22 mm. 



General color black. 



Head black, covered with white pile; a rather deep 

 transverse depressed area just behind the posterior ocelli ; 

 ocellar triangle wider than long ; hind ocelli about twice as 

 close to eyes as to each other. Antennae blackish brown. 



Prothorax black, longer than wide ; surface lightly ru- 

 gose ; front and hind margins rounded ; sides somewhat 

 convex; front angles broadly rounded, entire pronotum 

 covered with white pile. Legs blackish, somewhat lighter 

 inside. Wings subhyaline with a reddish hue. Except 

 for the fact that Rs and M of forewing both arise from 

 the arculus the venation is like that of Leuctra. In the 

 hind wings of the type there are two or three cubital 

 crossveins. 



Abdomen blackish with a lighter dorsal longitudinal 

 stripe ; ventral surface of abdomen brown. 



Male. Unknown. 



Female. Posterior margin of the eighth abdominal 

 sternite slightly emarginate in the middle and not pro- 

 duced into a subgenital plate (type rather badly shriv- 

 eled). 



This species was described by Banks from a single $ 

 from Wellington, B. C. (Taylor). 



Type, female, 11367 (Banks Collection, Museum Com- 

 parative Zoology, Cambridge, Mass.) ; from Wellington, 

 B.C. 



Perlomyia utahensis, new species. 



(Plate 32, fig. 5; plate 43, figs. 1, 2.) 



Length to tip of wings, male, 11 mm. Expanse, 19 mm. 



General color dark brown. 



Head blackish, little wider than prothorax, covered 



