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. 



Youngfemale. — 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 Arctic Ocean), Kee- 

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

 Natashquan and Mingan Rivers), Newfoimdland, 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; Cozum^l 

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

 Duenas; SanJos^; Huamuchal; Santa Ana Mixtan; Lake Atitlftn), 



a Twenty-eight specimens. 



Locality. 



Wing. 



Tail. 



Ex- 

 posed 

 culmen. 



Tarsus. 



Middle 

 too. 



One adult male from Mackenzie (Slave E.) 



One adult male from Pennsylvania 



One adult male from District of Columbia 



One adult male from North Carolina 



Two adult males from Florida 



One adult male from Minnesota 



One adult male from e. Nebraska 



One adult male from Ft. Clark, Texas 



One adult male from Vera Cruz 



One adult male from Salvador 



One adult male from St. Thomas, Greater Antilles 



One adult male from Grenada 



One adult male from St. Andrews 



One adult male from Barbuda 



One adult male from St. Christopher 



One adult male from Guadeloupe 



One adult male from Santa Lucia 



One adult male from n. w. Alaska (Kowak E.) (S. a. cauHna) . 



Two adult males from coast ol s. Alaska (S. a. caurina) 



One adult male from coast British Columbia (,S. a. caurina) . . . 



Four adult males from California (5. o. caurina) 



One adult male from Nevada (S. a. caurina) 



One adult male from Montana (S. o. caurina) 



One adult male from Colorado (S. o. caurina) 



One adult male from Sonora (S. o. caurina) 



Two adult males from Chihuahua {S.a. caurina) 



158.5 



160.5 



159 



155 



155.5 



155.5 



154.5 



154 



159 



159.5 



156.7 



154.7 



157 



161 



145 



161 



164 



164.2 



166.5 



162.2 



164 



160 



164.5 



163 



162 



85.5 



82 



88.5 



86.7 



86 



89 



85 



85.5 



89 



86.7 



87.5 



88.5 



93.5 



88 



87 



90 



91.5 



89.5 



91.5 



92.1 



94 



91 



92.5 



90 



95.2 



61.5 



59 



57 



55 



60.2 



59 



55 



69 



53 



58.5 



56.2 



58.2 



56 



56 



59 



56 



59 



55 



58.2 



62 



60.2 



57.5 



56.5 



63 



58.5 



68.7 



11 



12 



11 



11.5 



11 



11.6 



11 



12 



11 



11 



11.2 



11.2 



12 



12 



12 



11 



11.5 



11 



11.2 



11 



11.5 



11.5 



11 



12 



11.5 



11.5 



15 



15.5 



16 



16 



14.7 



IS 



16.5 



15 



15 



16.5 



14.7 



15.7 



16 



16 



16 



16 



17 



16 



15 



IS 



16 



15.5 



15.5 



16.5 



15 



15.5 



