160 BULLETIN 2 03, UNITED STATES NATIONAL MUSEUM 



an adult male on February 21 when the snow was deep on the ground. 

 During March I saw several more, all adult males and single birds, 

 usually with a troop of Pygmy Nuthatches ; but it was not until the 

 first of April, when the other warblers were arriving, that they became 

 at all abundant." Scott (1885) found them on the Catalinas under 

 winter conditions, with snow on the ground, and says : "I think there 

 can be little if any doubt that they are residents all the year." And 

 Dr. W. P. Taylor (MS.) took one in the Santa Kitas on February 4, 

 1923. Just how far south go the birds that migrate away from Ari- 

 zona does not seem to be known, but apparently they have not been 

 detected beyond Chihuahua and Tamaulipas. Perhaps they do not 

 migrate at all. 



DISTRIBUTION 



Range. — Southwestern United States to northern Nicaragua. 



Breeding range. — The northern olive warbler breeds north to cen- 

 tral Arizona (Baker's Butte and White Mountains) and central west- 

 ern New Mexico (Reserve). East to western New Mexico (Reserve 

 and McIOiight's Canyon) ; Chihuahua (Colonia Garcia) ; southeastern 

 Coahuila (Diamante Pass) ; and southwestern Tamaulipas (Miqui- 

 huana). South to southwestern Tamaulipas (Miquihuana) and 

 southern Durango (Durango) . West to Durango (Durango) ; Sonora 

 (Sierra Saguaribo) ; and southeastern and central Arizona (Hua- 

 chuca Mountains, Santa Catalina Mountains, and Baker's Butte). 



Other races occur in southern Mexico and Central America. 



Winter range. — The northern olive warbler is probably migratory 

 to some extent, individuals withdrawing to the southern part of the 

 range, but it is found in winter occasionally or in small numbers as 

 far north as southern Arizona. 



Egg dates. — Arizona : 14 records. May 23 to July 1 ; 7 records, June 

 2 to 18, indicating the height of the season. 



DENDROICA PETECHIA AESTIVA (Gmelin) 



EASTERN YELLOW WARBLER 



PiATEs 24, 25 



HABITS 



The familiar yellow warbler, also commonly called the summer 

 yellow bird or wild canary, is the best known and the most widely 

 known of all of our wood w^arblers. It is one of the few birds that 

 almost everybody knows by one of the above names. It is universally 

 beloved as it comes to us in the flush of budding spring, gleaming 

 in the shrubbery, like a rich yellow flame among the freshly opening 

 leaves, or bringing to the apple orchards a flash of brilliant sunshine 



