Swifts. _ 
422. Black Swift (Cypselordes niger borealis). L. 73 
W. 6.5. Tail without spines, slightly forked. Ads. 
Sooty black, paler below; a black spot before the eye; 
se whitish. Notes. Generally silent. (Ben- 
ire. 
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 (Chatura 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 (Chetura 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 (4éronautes 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 Rocky Mountains north to Montana; on Pa- 
cific coast north to Lat. 38°; winters south of United States to Cen- 
tral America. 
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