b PREFA CK 



Museum of Natural History, of iNew York, the large collec- 

 tions in both museums were placed at the disposal of the 

 artists and the author. Thanks are due especially to Mr. 

 Witmer Stone, Mr. Samuel X. Rhodes, Dr. J. A. Allen, and 

 Mr. Frank M. Chapman for valuable advice and assistance. 



AUSTIN C. APGAR. 

 State Nohmal School, 

 Trextox, New Jeksev. 



