PLECOPTERA OF NORTH AMERICA 277 



ing in sharp points ; ninth sternite slightly produced and 

 evenly rounded. 



Female. Hind margin of eighth abdominal sternite not 

 produced into a subgenital plate. 



Distribution. — Holotype, male, allotype, female, April 

 30, Lake Forest, 111. (Cornell University Collection) 

 many females and one male, Apr. 30, Lake Forest, 111. 

 many males and several females, March 16, Ithaca, N 

 Y. ; two males, one female, March 7, 1908, Ithaca, N. Y. 

 two males, six females, April 7, Columbia, Mo. (C. R. 

 Crosby) ; four males, eight females, March 21, 1920, Bluff 

 Point, N. Y. ; three males, Feb. 9, 1919, Salineville, Ohio. 



Capnella pygmaea Burmeister. 



(Plate 47, figs, l, 8; plate 50, figs. 1-3.) 

 ]839. Semblis pygmaea Burmeister, Handb., 2:87-4. 



1841. Cupula pygmaea Pietet, Perlides, p. 324. 



1842. Captiia pygmaea Pietet, Ins. Neurop., p. 324. 

 1852. Capnia pygmaea Walker, Cat., p. 175. 



1861. Capnia pygmaea Eagen, Syn. Neurop. N. A., p. 32. 



1869. Capnia pygmaea Bethune, Can. Ent., 1:81. 



1876. Capnia pygmaea Provancher, Nat. Cand., 8:125-127. 



1892. Capnia pygmaea Banks, Cat., p. 342. 



1904. Capnia pygmaea Banks, Proe. Ent. Soe. Wash., 6:205. 



1907. Capnia pygmaea Tucker, Kans. Univ. Sci. Bull., 4:7S. 



1907. Capnia pygmaea Banks, Cat. Neurop., p. 15. 



1924. Capnella pygmaea Claassen, Can. Ent., 56:43. 



Length to tip of wings, male, 3-3.5 mm. ; female, 6-7.5 

 mm. Expanse, male, 4-4.5 mm. ; female, 8.5-12 mm. 



General color dark brown to blackish. Head blackish, 

 wider than prothorax', quite smooth, occiput with faint 

 longitudinal darker lines ; hind ocelli about twice as close 

 to eyes as to each other. Antennae blackish, with about 

 26-28 segments. Prothorax a little wider than long, wid- 

 ened behind, lightly rugose ; angles rounded. Legs brown. 

 Wings of male short, generally not reaching beyond the 

 fourth abdominal segment, although some of the males 

 are long winged; wings of female reaching to about the 

 tip of abdomen. Abdomen of female with a broad light 

 median longitudinal band extending to the hind margin of 

 segment eight ; tergites nine and ten evenly chitinized ; 

 male abdomen without longitudinal band. Tails blackish, 

 with about 15 segments. 



Male. Eighth abdominal tergite raised into a dou- 

 ble pointed tubercle ; tergites 9 and 10 with a broad 

 median groove or depression into which the supra-anal 

 process fits ; the process is recurved, long, and divided into 

 two parts, the upper angulate dorsally, deeply grooved, 



