208 THOMAS SAY FOUNDATION 



considerably produced with median notch ; just before 

 the notch a blunt tubercle. 



Distribution. — Holotype, male, March 22, 1908, Oak- 

 land Hills, Alameda Co., Calif. (E. C. VanDyke, in the Col- 

 lection of the California Academy of Sciences) ; allotype, 

 female, April 6, 1897, Seattle, Wash. ; one female, 4-6-97, 

 Seattle, Wash. ; one male, May 27, 1903, Fieldbrook, Calif. 

 (H. S. Barber) ; one female and one male, May 15, 1894, 

 Olympia, Wash.; two males, 20-7-03, Bear Lake, B. C; 

 one male, Sept. 4, 1891, Bouter's Ranch, Mont. 



Nemoura sinuata Wu. 



(Plate 36, figs. 1-4.) 

 1923. Nemoura sinuata Wu, Bulletin Lloyd Library No. 23, Ento- 

 mological Series, No. 3:1-47.* 



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

 mm. Expanse, male, 14-14.5 mm.; female, 16-16.5 mm. 



General color dark brown. Head wider than prothorax, 

 dark brown ; hind ocelli closer to eyes than to each other. 

 Prothorax hardly, wider than long, narrowed behind 

 angles widely rounded. Legs brown, femora sometimes 

 slightly darker in middle. Wings subhyaline, lightly in- 

 fuscated at stigma; anal field of hind wings small. Four 

 groups of gills in cervical region. 



Male. Subanal lobes divided into two narrow chitinous 

 bands, the inner smooth, unarmed and only about half as 

 long as the outer, which is long sinuate and armed with 

 spines, and ends in a sharp point ; cerci large, membranous 

 and borne on a narrow chitinous band, the basipodite; 

 subgenital plate not much prolonged ; ventral lobe narrow, 

 about three times as long as wide. 



Female. Seventh sternite not produced; eighth ster- 

 nite heavily chitinized in center and somewhat produced, 

 with a deep median notch. 



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

 Ithaca, N. Y. (Cornell University Collection). Many speci- 

 mens, males and females, June to August, Ithaca, N. Y., 

 and vicinity; July 5, 1918, Newcomb, N. Y. ; July-Aug., 

 Old Forge, N. Y. ; June 13, 1910, Gloversville, N. Y. ; Etna, 

 Tompkins Co., N. Y. ; McLean, Tompkins, Co., N. Y.; July 

 1, 1923, Alcohol Brook, Adirondack Lodge, N. Y. ; March 

 18-21, 1911, Barton, Ga. ; June, 1912, Black Mts., N. C. 

 Beutenmuller) ; July 18, 1919, Mt. Mitchell, N. C. (R. W. 

 Leiby) ; June 26, 1920, Cranberry Lake, N. Y. (C. J. 

 Drake) ; Greene Co., N. Y. 



*This species is described by Wu in footnotes in the above cited paper. He also 

 figures the genitalia. 



