THE BIRD BOOK 



be seen to, one at a time, dive headforemost into 

 tlie 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. Clnrliira 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. 



V2o. White-tiiroated Swift. 



White 



Mro)iautes mela)iuli'ucits. 



^<T 



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 ^"^ '"''' 



of twigs, and lined with feathers. They lay four or five dull white eggs, during 

 June or July; size .85 x .50. 



