Cogswell 1950 Circus cyaneus June 25 Sierra Valley Ranch, 1 mi. W 7 mi. N Sierraville, Sierra Co., Calif. - 1 in ? plumage flying at 50 ft., then down to 10 ft., over wet a marsh land of central part of open valley. July 26 Little Washoe Lake, 5000 ft., Washoe Co., Nev. - 1 in ? plumage beating over marshes S of lake at noon. Aug. 6 N side Carson Valley near Reno, Douglas Co., Nev. - 1 - Washoe Valley, N of Washoe L, 5000 ft., Nev. - 3 see. Aug. 7 E side Boca Res., 5560 ft., Nevada Co., Calif. - 1 ? flying low over a small grassy swale adjacent sagebrush flats. Aug. 9 Little Washoe L. [see above] - 1 over. Aug. 21 Grosser Cr., 5700 ft., 1 1/3 mi. E, 3 1/2 mi. N Truckee, Nevada Co., Calif 2 (both dark plumage) flying over, 1 low over the grassy valley, the other "travelling" fairly fast across sagebrush or past scattered pines, headed SSW. Aug. 23 8800 ft., 2 1/2 mi. S, 1/2 mi. E Mt. Rose, Carson Range, Washoe Co. Nev. - 1, in very bedraggled plumage, was riding the stiff breeze over brush-covered slope just S of the Mt. Rose - Slide Mtn. ridge. Occurrence at this altitude must indicate definite migration underway, at least altitudinally.