Mono County: Mono Mills, 1; near Benton, 2; near Big Prospector Meadow, 10,000-10,500 ft., White Mts., 15; Cottonwood Creek, 9200 ft., White Mts., 1. Inyo County: Silver Canyon, 7000-8000 ft., White Mts., 8; Roberts Ranch, 8300 ft., White Mts., 1; head of Black Canyon, 8000 ft., White Mts., 2; Independence, 3900 ft., 1 (vagrant); Mazourka Canyon, 8000-10,000 ft., Inyo Mts., 3; near Jackass Spring, 6000-6200 ft., Panamint Mts., 14; Hanaupah Canyon, 7500-9000 ft., Panamint Mts., 2. =Penthestes gambeli abbreviatus=, new subspecies Short-tailed Mountain Chickadee _Parus montanus_, of authors, part. _Parus gambeli_, of authors, part. _Penthestes gambeli_, of authors, part. _Type locality._--Horse Creek, Siskiyou Mountains (near Seiad Valley P. O.), Siskiyou County, California. _Type_, male, no. 119 (orig. no., in coll. J. Grinnell); December 12, 1901; collected by Malcolm P. Anderson. _Diagnosis._--Tone of color on sides, flanks and back the same as in _inyoensis_, though not quite so pale, namely, in fresh plumage, cartridge buff. Tail (see figs. 2, 3) much shorter than in either _gambeli_ or _inyoensis_; and bill averaging smaller than in any of the other three races. _Measurements._--Average of 14 males: Wing, 69.7 mm.; tail, 65.0; exposed culmen, 7.9; depth of bill at base, 3.8. For extremes, see accompanying table. _Range._--The higher mountains of central and northern California, southern Oregon (probably this subspecies), and northwestern[** sic] Nevada. Occurs west in northern California through the Siskiyou and Salmon mountains and to South Yolla Bolly Mountain and Mount Sanhedrin; and south in the Sierra Nevada to the vicinity of Mount Whitney. _Specimens examined_, 182, from the following localities: California: Modoc County: Sugar Hill, 4; Warner Mts., 27. Siskiyou County: Mt. Shasta, 3; Jackson Lake, 5900 ft., 5; South Fork Salmon River, 5000 ft., 1; head of Rush Creek, 6400 ft., 2; Kangaroo Creek, 3; Castle Lake, 5400 ft., 1; Horse Creek, Siskiyou Mts., 11; Beswick, 1. Trinity County: head of Bear Creek, 6400 ft., 4; head of Grizzly Creek, 6000 ft., 6. Tehama County: near South Yolla Bolly Mt., 4. Mendocino County: near Castle Peak, 1; near Sanhedrin Mt., 4. Lassen County: Eagle Lake, 6. Plumas County: Meadow Valley, 1. Nevada County: Independence Lake, 3. Placer County: Summit, 1; Cisco, 6000 ft., 18; Blue Canyon, 4700-5000 ft., 12; Dutch Flat, 1. Eldorado County: Tahoe Valley, 2; Kyburz Station, 1. Mariposa County: vicinity of Yosemite Valley, 13. Mono County: Warren Fork of Leevining Creek, 9200 ft., 1; Williams Butte, 7500 ft., 1. Fresno County: Bullfrog Lake, 10,600 ft., 6. Inyo County (not typical): near Kearsarge Pass at 8500 ft., 1; Little Onion Valley, 7500 ft., near Kearsarge Pass, 1; Cottonwood Lakes, 11,000 ft., 7. Tulare County (not typical): Whitney Creek, 11,000 ft., 3; Whitney Meadows, 9800 ft., 14; Olancha Peak, 10,000 ft., 1. Nevada: Pine Forest Mts., Humboldt County, 13.