a. septentrionalis Harris. Long-tailed Chickadee. Resident in eastern Idaho; intergrades with the next two races.
b. nevadensis (Linsdale). Pallid Black-capped Chickadee. Resident in southwestern and south-central Idaho.
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.)