FlCk 39. Rocky Mountain White-tailed Ptarmigan iu transitional plumage, 

 against snow-brindled ground. 



Photographed from life by Edward R. Warren. 



Fig. 40. Rocky Mountain White-tailed Ptarmigan on her nest. 2sear-ground-picturing pattern, of the grass-tvpe 'based of 

 rse, on full obhterative shading.) [See p. 47, Chap. VII.] - ■■• oi 



Photographed from life by Evan Lewis. 



