Cogswell 1950 Petrochelidon pyrrhonota June 20 L. Van Norden, 6780 ft., Placer & Nevada Co., Calif. I seen flying over meadow E. of lake and I near horse barns by the dam -- both of them flying with [illegible], swallows, which met nearby; but I know of no breeding place of Cliff Swallows in the Donner Pass region, although individuals were present in 1948 also (when a colony in Truckee was destroyed by house owner knocking down nests). June 22 Boca Reservoir, 5580 ft., Nevada Co., Calif. -- at least 30 present, flying up and down over sagebrush & grass slopes near the dam, on which they are apparently nesting. They also flew over the Truckee River nearby, later in p.m. June 25- Sierra Valley, Sierra Co., Calif. -- many seen in & near Sierraville, near Battley, and N. of those points. June 27- W. & S. of Reno, Washoe Co., Nev. -- several seen over farm- land (or over Idlewild Park in W. part of Reno) - Little Washoe L., 5020 ft., Washoe Co., Nev. - 3+ over. June 28 Boca Res. [see above] -- about 50 present. June 30 Soda Springs, 6750 ft., Nevada Co., Calif. -- about 15 on wires near horse barns below L. Van Norden (cf. June 20). July 4. I (only!) here. also 1 near E end L. Van Norden. July 9 Truckee, 5850 ft., Nevada Co., Calif. -- several flying over river valley E. of town. July 10 E. side Boca Res. [see above] -- an est. 100+ flying over sagebrush flat with several grassy swales near the reservoir. July 18 N.E. end L. Van Norden, 6800 ft., Placer Co., Calif. - 1 juvenile on wires with Tree Swallows. 1 Cliff Swallow live on 27 also.