Swifts 



422. Black Swift | Cypseloide. iger boreaas). L. 7; 

 W. 6.5. Tail without spines, slightly forked. Ads. 

 Sooty black, paler below; a black spot before the eye; 

 forehead whitish. Notes. Generally silent. (Ben- 

 dire.) 



Range. — Breeds from Central America north, In mountains of 

 western United States, to British Columbia; east to Colorado; winters 

 south of United States; more common in Pacific coast states. 



423. Chimney Swift {Chcetura pelagica). L. 5.4; 

 W. 4.9. Tail with protruding spines. Ads. Above 

 sooty, rump and underparts paler; throat whitish. 

 Notes. A rolling twitter. 



Range. — Eastern North America, west to the Plains; breeds from 

 Florida to Labrador and Manitoba; winters south of United States, to 

 Central America. 



424. Vaux Swift ( Chcetura vauxii). L. 4.5; W. 4.4. 

 Ads. Similar to No. 423, but smaller and somewhat 

 browner. Notes. Resemble those of No. 423, but are 

 less frequently uttered. (Bendire.) 



Range. — Western United States; breeds on Pacific coast, locally. 

 north to British Columbia: east casually to Montana and Arizona; 

 winters south of United States to Central America. 



425. White-throated Swift (Aeronautes melanoleu- 

 cus). L. 6.5. Tail forked, without spines. Ads. 

 Above sooty brownish black; breast, middle of belly 

 and flank patches white. Notes. A sharp, metallic 

 twitter. 



Range. — Western United States; east to western Nebraska and 

 Black Hills; breeds in Rockv Mountains north to Montana; on Pa- 

 cific coast north to Lat. 38 ° : winters south of United States to Cen- 

 tral America. 



158 



