416 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



270-320 (312); wing, 150-165 (158.6); tail, 81-96 (88.7); exposed 

 culmen, 54.5-63 (58.7); tarsus, 10-12 (11); middle toe, 14.5-16 

 (15.6).« 



Young male. — Similar to the adult male, but jugular band more or 

 less tinged or intermixed with cinnamon or cinnamon-brown. 



Young female. — Similar to the adult female but jugular band largely 

 (often mostly) cinnamon-rufous, or much intermixed with that color, 

 instead of mostly or wholly bluish gray. 



Eastern North America; north to Mackenzie (Slave River; Great 

 Slave Lake; Mackenzie and Anderson Rivers to Arc tic Ocean), Kee- 

 watin (Ft. ChurchiU) , northern Quebec, Labrador (Northwest, Little 

 Natashquan and Mingan Rivers), Newfoundland, etc.; west to base 

 of Rocky Mts. and (during migration) to Ft. Clarke (western Texas); 

 breeding southward to Gulf coast and southern Florida; in winter 

 southward throughout West Indies, to Bermuda, and through eastern 

 Mexico, in States of Tamauhpas, Vera Cruz (Jalapa; Orizaba), 

 Oaxaca (Santa Efig^nia) and Yucatan (Progreso; Shkolak; Cozumel 

 Island), and through Guatemala (GoKo Dulce; San Geronimo; 

 Duenas; San Jose; Huamuchal; Santa Ana Mixtan ; Lake AtitUn), 



a Twenty-eight specimens. 



