Cogswell 1950 Dendroica occidentalis [N.B. - Later records than Aug. 10 were only of birds heard or glimpsed, hence not definitely this species] June 17: Big Bend Camp &nd., 5800 ft., on S Fork Yuba R., Placer Co., Calif. 1 heard singing from tall, dense conifers (white fir, Jeffrey & lodgepole pines). The song is drawling in the first 3 or 4 notes, much like D. nesotensis, but then runs into a light, see sawing trill without the drawling quality. [1 & was seen feeding young here in 1948] June 23 5100 ft., 1/3 mi. S Lake Spaulding, Nevada Co., Calif - 2 heard singing in tall, dense forest of white fir, incense cedar, yellow pine, a few sugar pines & Douglas firs. There is a good understory of dogwood, Ceanothus integer- rinicus, thimbleberry, etc. along the road; but the warblers do not seem to use it, staying rather well up in the tall trees. However, This sp. has yet to be located in similarly dense red fir & lodgepole or white pine forests in the Canadian zone (which lacks understory). June 30 Big Bend Camp &nd., 5800 ft. (see above) - 2 &'s, which had been (a.m.) singing, interrupted same to come to my whistled owl call (Pygmy - 'dew-wket') & settled from lower branches of tall firs. (pm) 17, 18 came to owl call in same place. July 7 5100ft., 1/3 mi. S Lake Spaulding (see above) - 1 heard singing. July 17 near Sugar Bowl Lodge, 7000 ft., 1.2 mi. SSW Donner Pass, Placer Co., Calif - 1 &-plumaged individual seen in red firs at forest edge by willow-filled "meadow" July 31 3+ &'s (or imm.) seen in red fir - lodgepole + silver pine forest. - on 1 1/2 hrs. spent slowly walking there. Aug. 3 15+ seen in same area or similar coverage - all &'s or imm. Aug. 10 Ice Lakes Camp &nd. 6900ft. 3 mi. W 1mi. S Donner Pass - 1 & seen.