c. _fortuitus_ (Davison and Bowles). Columbian Black-capped Chickadee. Resident in northern and central Idaho. _Parus gambeli_ Ridgway. Mountain Chickadee. Common resident in the Transition Life-zone. a. _grinnelli_ (van Rossem). Grinnell Chickadee. Resident in central and northern Idaho. (D. A. 1508, 10 mi. ESE Moscow, Latah County, March 18, 1940.) b. _inyoensis_ (Grinnell). Inyo Chickadee. Resident in southeastern Idaho. (D. A. 1361, Havenor's, 7 mi. NW Pocatello, Power County, April 1, 1939.) _Parus rufescens rufescens_ Townsend. Chestnut-backed Chickadee. Resident in central and northern Idaho. Rust (1915:129) records the bird from Fernan Lake, Kootenai County. _Parus inornatus griseus_ (Ridgway). Gray Titmouse. Fairly common resident in southeastern Idaho in the piñon-juniper association. (D. A. 1366, Pocatello Creek, 3 mi. E Pocatello, Bannock County, April 2, 1939.) _Psaltriparus minimus plumbeus_ (Baird). Lead-colored Bush-tit. Uncommon resident in the piñon-juniper association of southern Idaho. The Museum of Vertebrate Zoölogy has specimens collected by me at S Fork Owyhee River, 12 mi. N Nevada line, Owyhee County. _Sitta carolinensis tenuissima_ Grinnell. Inyo Nuthatch. Fairly common resident in the Transition Life-zone. (D. A. 1286, 3 mi. NE Princeton, Latah County, November 20, 1938.) _Sitta canadensis_ Linnaeus. Red-breasted Nuthatch. Common resident in the Transition Life-zone. (D. A. 1905, 11 mi. SSW Idaho City, Boise County, October 20, 1946.) _Sitta pygmaea melanotis_ van Rossem. Black-eared Nuthatch. Fairly common resident in the Transition Life-zone. (D. A. 1552, 10 mi. NE Moscow, Latah County, May 11, 1940.) _Certhia familiaris caurina_ Aldrich. Northwestern Creeper. Common resident in the Transition Life-zone. (D. A. 1304, Paradise Ridge, 3 mi. S Moscow, Latah County, December 10, 1938.) _Cinclus mexicanus unicolor_ Bonaparte. Dipper. Common resident. Rust (1915:128) reports that this bird is regularly seen along mountain streams in Kootenai County. _Troglodytes aëdon parkmanii_ Audubon. Western House Wren. Common resident. (Univ. Idaho No. 50, Moscow, Latah County, May 25, 1937.) _Troglodytes troglodytes pacificus_ Baird. Western Winter Wren. Uncommon resident in the Canadian Life-zone of central and northern Idaho. (D. A. 1269, Lochsa River, at Van Camp, Idaho County, November 5, 1939.) _Telmatodytes palustris pulverius_ Aldrich. Northwestern Long-billed Marsh Wren. Common resident in suitable localities. (D. A. 1769, 2 mi. SW Notus, Canyon County, February 20, 1941.) _Catherpes mexicanus griseus_ Aldrich. Northern Canyon Wren. Uncommon resident in southern Idaho, extending north at least to Idaho County. (D. A. 1702, 4 mi. NW Pollock, Idaho County, July 15, 1940.) _Salpinctes obsoletus obsoletus_ (Say). Common Rock Wren. Resident in southern Idaho. (D. A. 1799, Boise, Ada County, June 24, 1941.)