BIRDS OF NORTH AND MIDDLE AMERICA. 



81 



(skins), 144^165 (156.5); wing, 110-120.5 (116.4); tail, 71-80 (76.4); 

 exposed culmen, 7-8.5 (7.8); width of bill at frontal antiee, 6-7 (6.6); 

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



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

 sooty black, much more faintly glossed with blue than back; forehead 

 dull light brownish or brownish buflf; 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 

 through central and western Mexico as far as states of Guanajuato and 

 Jalisco (Guadalajara) and territory of Tepic; in winter from southern 

 Florida (Tarpon Springs) and southern Mexico, through Central 

 America and South America as far as southern Brazil, Paraguay, 

 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. 



Sirundo erythrogaster Boddaeet, Tabl. PL Enl., 1783, 45 (based on Hirondelle d, 

 ventre roux de Cayenne, Daubenton, PL EnL, vii, pL 724, fig. 1). — Baihd, 

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

 man, BioL Centr.-Am., 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). — Geinnell (J.), Condor, iii, 



''Fourteen specimens. 



Specimens from tbe eastern United States compare in average measurements with 

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

 respectively, as follows: 



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 satisfactory comparison. 



^Not yet recorded from other West India islands. 



10384^voL 3—03 6 



