xiv BRIEF FOREWORD 



known to systematic students. Besides, constant com- 

 parison has been made between the birds of the West 

 and the allied species and genera of our Central and 

 Eastern States. For this reason the range of the vol- 

 ume really extends from the Atlantic seaboard to the 

 parks, valleys, and plateaus beyond the Continental 

 Divide. 



L. S. K. 



