PLECOPTERA OE XORTH AMERICA 263 



General color brown. Head wider than prothorax ; lat- 

 eral tubercles large, polished; occiput with longitudinal 

 rugosities ; hind ocelli at least three times as close to eyes 

 as to each other ; antennae dark brown, darker toward the 

 tip. Prothorax a little wider than long; a little widened 

 behind; angles rounded; surface somewhat rugose; the 

 rugosities mainly in the form of three longitudinal darker 

 irregular lines. Legs brown. Wings subhyaline; R of 

 forewing only slightly sinuate at the origin of Rs. Ab- 

 domen brown ; cerci brown, composed of about twenty 

 segments. 



Male. Hind margin of eighth abdominal tergite deeply 

 emarginate so that there is only a narrow chitinized "col- 

 lar" in the center, leaving the main portion membranous ; 

 ninth tergite with two round, raised, chitinous knobs 

 which are granular and beset with long hairs, the area be- 

 tween the knobs largely membranous ; tenth tergite bifid ; 

 supra-anal process recurved, short, enlarged, excavated 

 above and bearing on the ventral side near the tip a tooth ; 

 subanal lobes triangular, ending in short spine-like proc- 

 esses ; ninth sternite slightly produced and evenly 

 rounded. 



Female, unknown. 



Holotype, male, April 14, 1918, Cazadero, Calif. (E. P. 

 Van Duzee, in the California Academy of Sciences). 



Capnia fibula Claassen. 



(Plate 48, fig. 12; plate 49, fig. 1.) 

 1924. Capinia fibula Claassen, Can. Ent., 56:56. 



Length to tip of wings, male, 7 mm. ; female, 9 mm. 

 Expanse, male, 12 mm. ; female, 16 mm. 



General color dark brown. Head wider than prothorax ; 

 lateral tubercles large, dark, flat, polished; occiput some- 

 what rugose ; hind ocelli about twice as close to eyes as 

 to each other. Antennae of male gone, in female composed 

 of thirty-three segments. Prothorax wider than long; 

 sides about straight ; front angles broadly rounded ; hind 

 angles quite sharp; surface very slightly rugose. Legs 

 brown; wings lightly infuscated; crossvein beyond sub- 

 costa originates at the cord ; R sinuate at the origin of Rs. 

 Tails long, composed of thirteen or more segments. 



Male. Seventh tergite bearing on the median posterior 

 margin a rounded button, closely beset with small papillae ; 

 supra-anal process recurved, short, truncate, the tip 

 slightly emarginate ; ninth sternite slightly produced and 

 rounded behind, subanal lobes ending in short upcurved 

 spine-like processes. 



