igote to ^ep. 



Since no key can make up for inaccurate observation, 

 it is essential that at least one or two points about an un- 

 known bird shall have been clearly seen before turning to 

 any key for aid in identification. 



Keep in mind (1) the relative size and (2) see accurately 

 some one or more distinguishing markings of any bird in 

 question. 



The following key includes the land birds described in the 

 foregoing pages. These are arranged by number, first in 

 three groups according to size (using the Robin and English 

 Sparrow as 10 and 6 inch measures of length respectively) 

 and second, according to distinguishing colors or markings. 



Suppose a bird at least as large as a Robin, i. e., 10 inches 

 or more in length, is seen, showing white outer tail-feathers 

 and some yellow beneath. Upon referring to the key only 

 one number, namely 502, will be found which answers this 

 description. When more than one number fulfils the con- 

 ditions of the observation it becomes necessary to compare 

 descriptions before coming to a decision. 



Blackface figures indicate female birds that are notice- 

 ably unlike the corresponding males. 



53 



