INDEX TO CHECK-LIST NUMBERS. 



IN the original edition of the Check-List each species and sub- 

 species was provided with a number which was placed before 

 the name. In the third edition while the same numbers were 

 maintained they were added in brackets after the name and this 

 practice has been continued in the present edition. These num- 

 bers have been used extensively in marking eggs in order to insure 

 their identity and to change them now would involve endless 

 confusion and inconvenience. 



The adoption of a new classification has, however, thrown them 

 entirely out of sequence and in order to ascertain quickly to what 

 species a given number pertains the following list has been pre- 

 pared giving the numbers in regular sequence with the page of the 

 present edition of the Check-List on which each will be found. 

 It has not been thought necessary to include the letters which 

 indicate the subspecies. 



Numbers which refer to species that have been dropped from 

 the List or referred to the Hypothetical List are included in 

 brackets while those applying to species which are now regarded 

 as identical with other species are so indicated. In a few cases 

 where species were reduced to subspecies the numbers were 

 inadvertently changed in the third edition. Such numbers are 

 here included with their equivalents. 



