Cogswell 1950 Hesperiphona vespertina 3 July 24 thru at least Aug.8 near Sugar Bowl Lodge - increased numbers very evident in forest & meadow borders, flying in small flocks, with frequent diagnostic call notes uttered both in tree tops & in flight. The loud single whistle, ("wheeeep") and a harsher rattled whistle are both used. Aug.4 Emigrant Gap, 5100 ft. Placer Co., Calif. - About 10 seen in trees flying over chaparral-covered N-facing slope. Aug.18 - flock of about 15 in this same area, flying between the several black oaks standing on the chaparral slope, and down into the brush (for berries?) S.E. side Bear Valley, 4600 ft. Placer Co., Calif. - about 20 seen (in 1 flock for a time) in white alders along stream & flying over to conifer & oak forest a few hundred yards away (this at foot of slope below last loc.) 28 and 19 were seen on wet sandy slope at water's edge, drinking briefly with head raised between sips. The banks of the stream bed are about 8 ft. high at this point, with the alders growing both on top & below the banks. Aug.24 E. & S.E. of Mary Lake, 7100 ft., 1/3 mi. SSW Donner Pass, Placer Co., Calif. - 3 flew over forest & chaparral areas. None have been encountered near Sugar Bowl Lodge for the past week or so. None today on "Signal Hill" [see above] where so common in July.