iv PREFACE. 
The matter is consecutively arranged under three heads: — 
I. Avpitions; IJ. Exvimrations; III. CHANGES oF NOMEN- 
CLATURE. The numbers at the left of the names facilitate 
collation with the Check-List. The interpolated species and 
subspecies are numbered in accordance with the provision 
made therefor in the Code of Nomenclature. (See page 14, 
last paragraph.) 
J. A. ALLEN, 
WILLIAM BREWSTER, 
ELLIOTT COUES, 
C. HART MERRIAM, 
ROBERT RIDGWAY, 
Committee. 
