THE BIRD BOOK 
be seen to, one at a time, dive headforemost into 
the tops of chimneys. The nest 
is made of small twigs firmly 
glued to the sides of the chim- 
ney, or tree, and to each other, 
with the glutinous saliva of the 
bird, making a narrow semi-circle 
platform for the reception of White 
their three to five white eggs which are deposited 
in May or June; size .75 x .50. 
424. Vaux’s Swift. Chcetura vauxi. 
Range. — Western United States, chiefly west of 
the Rockies; breeding north to British Columbia, 
and wintering south of the United States. 
Similar to the last but smaller 
(length 4.5 inches), and paler in 
color, fading to white on the 
throat. The habits of this spe- 
cies are like those of the east- 
ern Chimney Swift, except that 
the majority of these species still 
continue to use hollow trees as 
nesting places. The eggs are just like those of 
the last bird. 
White 
425. White-throated Swift. 
JErona u tes m elanolcucus. 
525-526 
Range. — Western United States south of Can- 
ada, and chiefly in the Rocky Mountains, and in 
California ranges, north to Lat. 38°. 
A handsome species, 6.5 inches in length, with blackish upper parts and sides, 
and white throat, breast and central line of under parts, flank 
patches and ends of secondaries; tail feathers not spined or 
stiffened. These birds are fairly common in some localities 
within their range, but appear to be found only on high ranges 
or in their immediate vicinity. They nest in crevices and 
caves in the face of cliffs, making a nest similar in construe 
tion to that of the Chimney Swift but of weed stalks instead White 
of twigs, and lined with feathers. They lay four or five dull white eggs, during 
June or July; size .85 x .50. 
270 
