733a. Gray titmouse. Parus inornatus griseus. Resident; not common; southern species, coming to eastern foothills.
735a. Long-tailed chickadee. Parus atricapillus septentrionalis. Not uncommon resident; winters on plains and in foothills; breeds from 7,000 to 10,000 feet; sometimes on plains.
738. Mountain chickadee. Parus gambeli. Abundant resident; nests from 8,000 feet to timber-line; ranges in the fall to the tops of the loftiest peaks.
744. Lead-colored bush-tit. Psaltriparus plumbeus. Resident; not common; western species, coming to eastern foothills.
748. Golden-crowned kinglet. Regulus satrapa. Rare summer resident; rather common in migration; breeds only near timber-line at about 11,000.
749. Ruby-crowned kinglet. Regulus calendula. Abundant summer resident; breeds from 9,000 feet to timber-line.
751. Blue-gray gnatcatcher. Polioptila cærulea. Rare summer resident; breeds on the plains and in the foothills.
754. Townsend's solitaire. Myadestes townsendii. Common resident; breeds from 8,000 to 12,000 feet; winters in mountains, though stragglers are sometimes seen on the plains. The author saw a pair on plains near Arvada, in company with a young, well-fledged bird.
756a. Willow thrush. Hylocichla fuscescens salicicola. Summer resident; rather common; breeds in foothills and parks up to about 8,000 feet.
758a. Olive-backed thrush. Hylocichla ustulata swainsonii. Rare migrant.