Perching Birds Marked With Blue 



766. Bluebird (Sialia sialis) . L. 7. Ad.tf. Above, 

 including wings and tail, bright blue; throat and breast 

 rusty brown, belly whitish. Ad. ?. Above grayer, 

 below paler. In winter specimens of both sexes have 

 upperparts tipped with rusty. Notes. Call, tur-wee, 

 tur-wee; song, a rich and sweet but short warble. 



Range. — Eastern United States; breeds from the Gulf States to 

 Nova Scotia and Manitoba; winters from southern New England and 

 southern Illinois southward 



76 6a. Azure Bluebird (5. s. a^urea). Similar to 

 No. 766, but breast paler, upperparts less deep, more 

 cerulean. 



Range. — Mountains of eastern Mexico north to southern Arizona. 



767. Western Bluebird ( Sialia mexicana 'Occident alts) . 

 L. 7. Ad. cf. Above bright blue,foreback with more or 

 less rust-brown, but rarely wholly chestnut; throat 

 blue, breast rust-brown, belly bluish gray. Ad. 9- 

 Above grayish blue; rust on foreback faintly indicated; 

 throat bluish gray, breast paler than in rj\ Notes. 

 Call, suggests that of No. 766, but is louder and 

 wilder. 



Range. — Pacific coast region from northern Lower California north 

 to British Columbia, east to western Nevada and casually, during mi- 

 grations, to New Mexico. (Ridgway.) 



767a. Chestnut-backed Bluebird (S. m. bairdi). 

 Similar to No. 767, but foreback wholly rust-brown. 



Range. — Rocky Mountain region from Wyoming south into Mexico. 



767b. San Pedro Bluebird (5. m. anabelce). 

 Rust-brown of back and breast greatly reduced in ex- 

 tent, usually wholly wanting or barely indicated on 

 back, and divided into two patches on breast by back- 

 ward extension of blue of throat; W. 4.2. (Ridgw.) 



Range. — San Pedro Martir Mountains, Lower California. 



768. Mountain Bluebird (Sialia arctica). L. 7.5. 

 Ad. (j\ Above beautiful cerulean blue, throat and 

 breast paler, belly whitish. Winter specimens are 

 more or less tipped with brownish. Ad. 9. Above 

 brownish gray, rump blue, throat and breast gray- 

 ish buff; belly whitish. Notes. Call, suggests that 

 of No. 766, but in fall is merely a feeble chirp. 

 (Ridgw.) 



Range. — Western United States, except Pacific coast; breeds from 

 the Sierra Nevada east to the Plains and from New Mexico north to 

 the Great Slave Lake region; winters from the Mexico boundary 

 states south into Mexico. 



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