206 THOMAS SAY FOUNDATION 



Holotype male, allotype female, Boulder, Colo. (G. S. 

 Dodds, Cornell University Collection) ; five additional 

 males and eight females, same locality. 



Nemoura depressa Banks. 



(Plate 32, fig. 6; plate 35, figs. 9-12.) 

 1898. Nemoura depressa Banks, Trans. Am. Ent. Soc, 25:200. 

 1905. Nemoura depressa Banks, Invert. Pacif., p. 87. 

 1907. Nemoura depressa Banks, Can. Ent., 39:329. 

 1907. Nemoura depressa Banks, Cat., p. 14. 



Length to tip of wings, male, 7.5-8 mm. female, 9-10 

 mm. Expanse, male, 15-16 mm. ; female, 16-17 mm. 



General color reddish brown. Head a little wider than 

 prothorax; hind ocelli at least twice as close to eyes as 

 to each other; antennae brown, darker toward the tip. 

 Prothorax wider than long, slightly narrowed behind, 

 moderately rugose ; angles narrowly rounded. Wings 

 subhyaline, with a rusty tinge; anal field of hind wings 

 narrow. Legs reddish brown, femora a little darker 

 toward the tip but not banded. Gills present. 



Abdomen reddish brown, somewhat darker toward the 

 tip. 



Male. Subanal lobes produced, slightly upcurved and 

 broadly bifurcate at tip (side view) the inner portion of 

 subanal lobe short and somewhat triangular; cerci mem- 

 branous; at base of cercus a large asymmetrical, chiti- 

 nized, lobe almost as long as the cercus ; supra-anal proc- 

 ess recurved, slender, finely spinulose above ; subgenital 

 plate short ; ventral lobe about two and one half times as 

 long as wide. 



Female. Seventh sternite only very slightly produced 

 posteriorly ; eighth sternite deeply notched in middle. 



Distribution. — Type, female, No. 11359, Sept., Cottage 

 Grove, Ore. (Morse, in Banks Collection, Mus. Comp. Zool., 

 Cambridge, Mass.) ; in Banks Collection are also one fe- 

 male, Sept., Cottage Grove, Ore.; one female, Sept., Di- 

 vide, Ore.; two females, Ore.; one female, Aug. 23, 

 Laggan, B. C. 



We have specimens as follows : March 8, 1908, Oakland 

 Hills, Alameda Co., Calif. (E. C. VanDyke) ; March 25, 

 1919, Monterey Co., Carmel, Calif. (E. C. V. D.) ; Sept. 

 4, 1905, Palo Alto, Calif.; April 11, 1919, San Francisco, 

 Calif. (E. P. VanDuzee) ; May 1, 1921, Fairfax, Marin 

 Co., Calif. (E. C. V. D.). 



