CHFX'K-LIST OF COLORADO BIRDS 343 



725a. Tul^ -wren. Cistothorus paludicola. Summer 

 resident ; not uncommon ; breeds from plains to 8,000 feet ; 

 some remain all winter in liot-water swamps. 



725c. Western marsh wren. Cistothorus palustris 

 PLESius. Summer resident ; not uncommon locally. 



726b. Rocky Mountain creeper. Certhia familiaris 

 MONTANA. Common resident ; in breeding season con- 

 fined to the immediate vicinity of timber-line, where some 

 remain the year round. 



727. White-breasted nuthatch. Sitta carolinensis. 

 Resident ; not common. 



727a. Slender-billed nuthatch. Sitta carolinensis acu- 

 leata. Common resident ; western form ; commonly 

 breeds from 7,500 feet to timber-line. 



728. Red-breasted nuthatch. Sitta canadensis. Not 

 uncommon resident ; migrant on the plains ; resident in 

 the mountains to about 8,000 feet, sometimes 10,000. 



730. Pigmy nuthatch. Sitta pygm^a. Abundant resi- 

 dent ; mountain bird ; makes scarcely any migration ; 

 most common from 7,000 to 10,000 feet. 



733a. Gray titmouse. Parus inornatus griseus. Resi- 

 dent ; not common ; southern species, coming to eastern 

 foothills. 



735a. Long-tailed chickadee. Parus atricapillus sep- 

 tentrionalis. Not uncommon resident ; winters on plains 

 and in foothills; breeds from 7,000 to 10,000 feet; some- 

 times 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. 



7-t4. Lead-colored bush-tit. Psaltriparus plumbeus. 



