364 BULLETIN 2 3, UNITED STATES NATIONAL MUSEUM 



in August, when various families had united into small flocks, and were 

 lingering in company with other insectivorous birds, before their de- 

 parture for the South, their preference for their native pines was still 

 evident." 



I found it fairly common in the upper reaches of Ramsey Canyon 

 in the Huachuca Mountains of Arizona, among the tall, scattered 

 yellow pines, at elevations between 6,000 and 7,000 feet, where a nest 

 with young was found on June 4, 1922. Swarth (1904) found it more 

 common there as a migrant than as a breeding bird and rather irregu- 

 lar in its abundance. 



Grace's warbler, now well-known as a summer resident in the moun- 

 tains of southern Colorado, New Mexico, Arizona, Sonora, and Chi- 

 huahua, is apparently closely related to the yellow-throated warbler 

 of the southern States and to Adelaide's warbler of Puerto Rico ; it has 

 a slightly differentiated subspecies in Central America. 



Nesting. — What is probably the first authentic nest of Grace's 

 warbler to be reported was taken in Yavapai County, Ariz., on June 

 23, 1890, by H. Keays for H. P. Attwater. This nest is described by 

 Samuel B. Ladd (1891) as "placed on limb of pine sixty feet from the 

 ground. Nest very compact; outside diameter 3 in. by II/2 in. high; 

 inside diameter 1% in. by I14 in- deep. The body of this nest is com- 

 posed of horse-hair, strings and vegetable fibres. The most abundant 

 vegetable material interwoven consists of the staminate catkins and 

 bud scales of Quercus emoryi. There is also some wool, vegetable 

 down, and insect webbing, in which are entangled the exuviae of some 

 caterpiller. Attached on the outside was a small staminate cone of a 

 species of Pinus. Nest well lined with feathers and horse-hair." 



O. W. Howard (1899) found two nests in Arizona; one nest was 

 "placed deep down in the middle in a large bunch of pine needles and 

 was entirely hidden from view." The other he found "in a red fir 

 tree. It was placed in a thick bunch of leaves at the extremity of a 

 limb about fifty feet from the ground." A nest with four eggs, in the 

 Doe Museum in Gainesville, Fla., taken by O. C. Poling on May 25, 

 1891, at 8,000 feet in the Huachuca Mountains, was built in a bunch of 

 pine needles and cones at the end of a long branch of a red pine, 20 

 feet from the ground. 



Eggs. — From 3 to 4 eggs, apparently more often 3, make up the set 

 for Grace's warbler. They are ovate with a tendency toward elongate 

 ovate, and are only slightly glossy. They are white or creamy white, 

 finely speckled and spotted with "auburn," "bay," or "chestnut brown," 

 intermingled with "light brownish drab," "deep brownish drab," or 

 "pale vinaceous drab." The markings are concentrated at the large 

 end, where they frequently form a distinct wreath, leaving the lower 



