Fig. 42. Hocky Mountain White-tailed Ptarmigan among pebbles, rocks and grasses. (Female and cliick.) [Cf. Figs. 39-41. J 



Photographed from life by Edward R. Warren. 



Fig. 43. Sage Gronse (Centi-ocercus uropha&ianiis) , a 'grass-patterned' 

 and 'shadow -marked ' bird. 



Photographed fi-om life by Edward R. Warren. 



