BIRDS OF NORTH AND MIDDLE AMERICA. 



81 



(skins), 144-165 (155.5); wing-, 110-120.5 (115.4); tail, 71-80 (76.4); 

 exposed culmen, 7-8.5 (7.8); width of lull at frontal antias, 6-7 (6.5); 

 tarsus, 10.5-11 (11); middle toe, 11-12 (11.7).« 



Young. — Much duller in color than adults; pileum and hindneck 

 sooty ])lack, jiuich more faintly g-lossinl with blue than back; forehead 

 dull lig-ht brownish or brownish buii'; chin and throat vinaceous-cin- 

 namon. 



North America in general; north to Alaska (Kowak River, St. 

 Michael, Pribilof Islands, Unalaska, Nulato, etc.), Ungava (head of 

 Hamilton Inlet), etc., accidentally to Greenland (two specimens); 

 breeding- southward over whole of United States (except Florida?) and 

 throug-h central and western Mexico as far as states of Guanajuato and 

 Jalisco (Guadalajara) and territor}' of Tepic; in winter from southern 

 Florida (Tarpon Springs) and southern Mexico, throug-h Central 

 America and South America as far as southern Brazil, Paragua}-, 

 Argentina, Bolivia, and Peru, and throughout West Indies (Bahamas, 

 Cuba, Grand Cayman, Cayman Brae, Jamaica, Porto Rico. Sombrero, 

 St. Croix, St. Bartholomew, Guadeloupe, Grenada, and Barbados^); 

 Swan Island, Carribean Sea; accidental in Galapagos Archipelago 

 (Charles and Chatham islands) and occasional in Bermudas. 



Hirundo erythrogaster Boddaert, Tabl. PL Enl., 1783, 45 (based on Hirondelle d. 

 ventre roux de Cayenne, Daubeuton, PI. Enl., vii, pi. 724, fig. 1). — Baird, 

 Review Am. Birds, 1865, 295 (Vermejp R., Paraguay). — Salvin and God- 

 man, Biol. Centr.-Ani., Aves, i, 1883, 232. — American Ornithologists' 

 Union Committee, Auk, xvi, 1899, 122;— Wilson (S. S.), Auk. xvi, 1899, 

 189 (San Miguel Co., New Mexico, breeding). — Grixnell (J.), Condor, iii, 



« Fourteen specimens. 



Specimens from the eastern United States compare in average measurements with 

 those from the western United States (including British Columbia) and Alaska, 

 respectively, as follows: 



Locality. 



Width of 

 bill at 

 frontal 

 antia-. 



Tarsus. 



Middle 

 toe. 



MALES. 



Eleven adult males from eastern XTnited States. . . 



Ten adult males from western United States and 

 British Columbia 



Tlircc adult males from Alaska (two from Una- 

 laska Island) 



FEMALES. 



Six adult females from eastern United States 



Seven adult females from western United States.etc 

 Two adult females from Unalaska Island 



6.4 



7 



6.7 

 6.3 

 6.5 



11.2 

 10.7 

 11 



11 

 10.9 



12 



n.9 



12.2 



12 



11.6 



11.2 



I am unable to appreciate any color differences, unless it be that western and 

 Alaskan specimens are more rarely pale colored beneath. The series of eastern 

 specimens, however, is too meager for siitisfactory comparison. 



'^Not yet recorded from other West India islands. 



10384— VOL 3—03 G 



