in keeping with the fact that on mountains there is an unusually great pro- 

 portion of side-light. 



Still another notable type of pattern worn by birds of grass-lands and the 

 open plains, is composed of a system of bold transverse bars of black and 

 brown, or kindred colors. This exists, for instance, on some of the Tinamous 

 (TinamidcE) of South America, and, in a very high state of development, on 

 the European Great Bustard (Otis tarda). Its effect is much the same as 

 that of the other grass-patterns, but it seems in most cases to be a cruder and 

 less highly finished form. The pattern of the Little Bustard (Otis tetrax) is 

 somewhat of this type, though refined toward elaborate picturing, and is very 

 beautiful and effective. The female especially is one of the most exquisitely 

 counter-shaded and picture-patterned of birds. 



48 



