PLECOPTERA OF NORTH AMERICA 273 



Key to the Species of Capnella. 



Males. 



1. Eighth abdominal tergite (antepenultimate seg- 



ment) with a single, raised, chitinous tubercle 

 or knob 2 



Eighth abdominal tergite with two raised, chiti- 

 nous tubercles or knobs 4 



2. Wingless ; knob on eighth abdominal tergite nar- 



row, transverse ; supra-anal processes long, 

 about as long as the first 7 or 8 segments of the 



cerci or tails vivipara 



Winged, although the wings may be much ab- 

 breviated; knob on eighth abdominal tergite 

 round or nearly so, never transverse ; supra- 

 anal processes not longer than the first 5 or 6 

 segments of the cerci 3 



3. Knob on eighth abdominal tergite consists of a 



continuation of the hind margin of the eighth 

 tergite, directed backward ; lower sheath of su- 

 pra-anal process notched on each side before 



the apex incisura 



Knob on eighth abdominal tergite placed before 

 the hind margin of the eighth tergite, not di- 

 rected backwards ; lower sheath of supra-anal 

 process not notched before the apex recta 



4. Tubercles on eighth abdominal tergite blunt and 



placed before the hind margin of the eighth 

 tergite ; upper part of supra-anal process with a 



bulbous enlargement at the tip pygmaea 



Tubercles on eighth abdominal tergite pointed, 

 continuous with the hind margin of eighth ter- 

 gite, directed backward ; beneath each of the 

 larger tubercles is a small tubercle ; upper part 

 of supra-anal process not with a bulbous en- 

 largement at the tip granulata 



Capnella granulata Claassen. 



(Plate 47; figs. 3, 5; plate 50, figs. 6, 7.) 

 1924. Capnella granulata Claassen, Can. Ent., 56:44. 



Length to tip of wings, male, 3-3.5 mm. ; female, 6-7 

 mm. Expanse, male, 4-5 mm. ; female, 11-12.5 mm. 



Length to tip of abdomen, male, 5-6 mm. 



General color dark brown to blackish. Head a little 

 wider than prothorax ; lateral tubercles large, flat, pol- 

 ished; head covered with rather long whitish pile; ocelli 



