Cogswell 1950 Stelgidopteryx rufipennis June 22 - Boca, 5500 ft., Nevada Co., Calif. - at least 4 or 5 birds of this sp. were mixed with the more numerous cliff swallows foraging over Truckee River and nearby sagebrush & forest border. I think they nest in a 40 ft. high gravelly dirt bank just S and below Boca Dam. June 28 - Several seen below dam, flying close to the bank mentioned above. July 10 Ditto. One person in my car saw a "swallow" fly into a hole in this bank. Aug. 5 E. end of Reno, 4500 ft., Washoe Co., Nev. - 2+ flying over farmland among suburban residences, a few blocks from Truckee River.