190 BULLETIN 2 03, UNITED STATES NATIONAL MUSEUM 



Sonoran river valleys, the Colorado and the Gila, with their tribu- 

 taries. * * * I know of no breeding record of a yellow warbler 

 from any point in Arizona north of the Mogollon Divide." Mrs. 

 Bailey (1928) says that "the lower Rio Grande in New Mexico ap- 

 parently marks the most northern extension of the range of the Sonora 

 Yellow Warbler. It is a common breeder at Mesilla," which is in the 

 southwestern part of the State. 



We found the Sonora yellow warbler breeding commonly in the 

 San Pedro Valley, near Fairbank, Ariz., and found several nests in a 

 row of willows along an irrigation ditch. The nests, from 12 to 15 

 feet above the ground in slender trees, were not very different from 

 those of the eastern bird, being made mainly of willow cotton inter- 

 woven with fine strips of inner bark, fine grasses, and plant fibers. 



The eggs do not differ greatly from those of the species elsewhere, 

 though what few I have seen are more faintly and finely speclded. 

 The measurements of 40 eggs average 16.9 by 12.8 millimeters; the 

 eggs showing the four extremes measure 18.4 by 13.1, 17.0 by 13.6, 

 14.9 by 12.5, and 17.8 by 11.4 millimeters (Harris). 



DENDROICA PETECHIA GUNDLACHI Baird 



CUBAN YELLOW WARBLER 

 HABITS 



The Cuban yellow warbler was originally described by Baird (1864) 

 as a full species but is now regarded as a subspecies of Dendroica 

 petechia. Ridgway (1902) describes it as "similar to D. p. petechia^ 

 but duller in color; adult male with upper parts much darker olive- 

 green, the pileum usually concolor with the back, sometimes slightly 

 more yellowish, very rarely tinged with orange-ochraceous, and wing- 

 edgings less purely yellow ; adult female usually duller in color than 

 in D. p. petechia.^ often grayish olive-green, or even largely gray, 

 above, and dull whitish, merely tinged here and there with yellow, 

 beneath." 



Until recently, its range has been supposed to include only Cuba 

 and Isle of Pines. Dr. Barbour (1923) says of its habits: "The 

 Mangrove Canary, as the Cuban Yellow Warbler is called, is abundant 

 wherever there are heavy high mangroves about the coast. I have 

 found it abundant in eastern and western Cuba, and on the Isle of 

 Pines as well. Gundlach reports it nesting in March. I incline to 

 believe that May is more usual; and then the nest of grass, small 

 feathers and woolly down, is placed in a fork on some horizontal 

 mangrove limb. The whole life of the species is passed in the man- 

 grove forests." 



