270 THOMAS SAY FOUNDATION 



Abdomen brown with long blackish hairy tails. 



Male, unknown. 



Female. Hind margin of eighth abdominal sternite 

 not produced but rather emarginate in the middle. 



Holotype, female, Montana Experiment Station, Boze- 

 man, Mont., May 12, 1917 (R. A. Cooley, in Cornell Uni- 

 versity Collection). 



Genus CAPNURA Banks. 



1900. Ca i>n urn Banks, Trans. Am. Ent. Sot-., 20:24.1. 

 1907. Capnura Banks, Cat. Neurop., p. 15. 

 1909. Capnura Enderlein, Zool. Anz., 34:391. 



Small blackish stoneflies 10-12 mm. in length, very sim- 

 ilar to Capnia Pict. 



Head black, pilose with three ocelli, the hind ocelli 

 closer to the eyes than to each other; a depressed area 

 between the hind ocelli ; antennae long, submoniliform. 



Prothorax blackish, narrower than head ; surface only 

 lightly rugose, front angles broadly rounded, somewhat 

 narrowed behind. Legs dark, first and third tarsal seg- 

 ments subequal, second segment about one-fourth as long 

 as first. Wings subhyaline or lightly inf uscated ; veins 

 dark but not heavy ; few or no costal crossveins ; several 

 irregular crossveins between Rl and R2-3 and sometimes 

 one between R2-3 and R4-5 ; only one median and one 

 cubital crossvein in forewing (not counting end ones) ; 

 anal field of hind wing containing three veins. 



Abdomen dark brown; setae or tails long, composed of 

 twelve or more hairy segments. 



Male, unknown. 



Female. Hind margin of eighth abdominal sternite not 

 produced into a distinct subgenital plate. 



Genotype, Capnura venosa Bks. 



This genus contains one species of which only the fe- 

 males are known. 



Capnura venosa Banks. 



(Plate 47, fig. 7; plate 49, fig. 13.) 

 1900. Capnura venosa Banks, Trans. Am. Ent. Soc, 20:245. 

 1907. Capnura venosa Banks, Cat. Neurop., p. 15. 



Length to tip of wings, female, 10 mm. Expanse, 18 

 mm. 



•General color black, the wings slightly infuscated. 



Head black, covered with rather long hairs. A de- 

 pressed area between the hind ocelli and another one just 

 back of the front ocellus. Lateral tubercles large, flat, 



