THE CANADIAN ENTOMOLOGIST. 305 



ventrally. Succeeding segments also similarly deeply striate, the 

 stria} coarse and well separated above, nearer together ventrally, 

 not occurring above level of dark repugnatorial areas. 



Repugnatorial pore small, in most segments a considerable 

 distance removed from the suture, which at its level is straight 

 or only slightly and broadly excurved. 



Anal tergite with tip acute and spinous, clearly exceeding the 

 valves, distally weakly and evenly decurved, but by no means so 

 strongly or angularly as in canadensis. 



Anal valves not mesally distinctly margined, at most broadly 

 somewhat raised, the border crossed by transverse striae. 



Anal scale with caudal margin widely convex; mesally slightly 

 indented. 



Mandibular stipes in male concavely excavated; produced 

 caudad below the excavation. 



Promentum of gnathochilarium in male much enlarged as 

 usual; elliptic in outline. 



First legs in male strongly enlarged as usual; uncinate; penult 

 article conspicuously crassate proximally, though less so than 

 preceding article, and narrowing much distad, its inner side nearly 

 straight. 



Second legs of male with coxa? much enlarged and produced 

 mesally into a long linguiform process, which is broadest proximally 

 and narrows distad, though widening a little at very end, which is 

 truncate. Legs reduced as usual. 



Anterior division of first gonopods of male broad, clavate, 

 distally rounded, in lateral view concealing wholly, or nearly so, 

 the caudal division, which is somewhat shorter than the anterior 

 and narrows strongly distad except at tip, where it enlarges again 

 a little and is distally subtruncate. 



Posterior gonopods in ventral view almost concealed by the 

 first, above which they do not rise. Each curves mesad near 

 level of distal end of first gonopods and then proximad. A semi- 

 membranous pointed blade-like branch arising from base and a 

 little surpassing posterior branch of first gonopods. 



Number of segments 44, or near that number. 



Length: 25 — 32 mm. 



Tn the general superficial appearance of the gonopods this 

 species resembles P. canadensis ; but the posterior division of the 



