10 - 



In order that the work in 1911 might be verified, collections have 

 been continued in several places during 1912. This will afford a com- 

 parison of the food in two succeeding years. 



The accompanying map (Fig. 3.) shows the localities in which col- 

 lections have been made. The localities from which complete series 

 were made and those localities from which incomplete series have been 

 obtained are indicated. 



A correct determination of the economic status of a bird is largely 

 dependent on a knowledge of its food. The food of a bird can be 



LEGEND 



O Complete series 

 "4" Incomplete series 



FIG. 3. Map of California showing localities from which non- 

 game birds have been collected for stomach examination. 



EXAMINATION OF STOMACH CONTENTS. 



roughly determined by watching the bird in the field. The most 

 dependable data concerning the food of most birds, however, is obtained 

 by examining the contents of the bird's stomach. Consequently 

 stomach examination has been largely depended upon to furnish needed 

 evidence as to the food of the birds under investigation. 



In the examination of the stomach contents a Zeiss binocular has been 

 used. After the contents has been carefully removed from the stomach 

 and placed on a glass plate, the binocular is used in sorting, counting, 



