U. S. NATIONAL MUSEUM 



BULLETIN 162 PLATE 40 



Female willow ptarmigan Brooding Young 

 Presented by Joseph Dixon, by courtesy of the Museum of Vertebrate Zoology, University of California. 



MALE WILLOW PTARMIGAN IN LATE-SUMMER PLUMAGE 

 Mount McKinley National Park, Alaska, September, 1926. Presented by Mr. and Mrs William L. 



