Marshall, 1939 General Comment 3 mi N. Heligman, 5700 ft., Coconino Co., Ariz. May 26. Early in morning coll. a Gray Vireo - several around camp - often in pairs & pursuing F. In absence of high trees for song perches, the M's sang beautifully on the wing. V. Solitary Vireo - but with more trills & runs & phrases in closer succession. Hiked for 4 mi., along S face of mesa. Saw 2 Hummers, shot one with sling as sat on top juniper - couldn't find it. It was green, with a very black gorget. Saw many rock wrens around out-crops in the side canyons. Each little side wash opened into a little brushy & grassy flat where Bewick Wrens could usually be found; also Say's Phoebe. Saw 2 white-throated swifts and a Swainson Hawk overhead. Saw 2 orioles (Scott?) in junipers, also several mockers. In one rocky side canyon were two pewees. Back at Camp - noted how many of the song birds sang on wing - owing to the