U. S. NATIONAL MUSEUM 



BULLETIN 179 PLATE 66 



Kent Island, New Brunswick, Jiil\- IS, VK^2. 



Adult building nest. 



A. O. Gross. 



Blue Island, 111. 



A. M. Bailey. 

 Courtesy Colorado Museum of Natural History. 



Nests on a building. 

 Northern Cliff swallow. 



