April 1904] BIRDS OF THE HUACHUCA MOUNTAINS, ARIZONA. 55 



the white of the abdomen being mixed with black; while the yellow areas 

 on the throat, crown, and sides, are more restricted in size, and brighter 

 in color, as compared with auduboni. In one specimen there is a black 

 line, narrow but well defined between the yellow of the throat and t!ie 

 lower mandible. But two adult females of nigrifrons were secured; both 

 are darker than female examples of andnboni, and with the yellow areas 

 more restricted. In one the breast, sides and blanks are covered with 

 rather narrow, sharply defined black streaks; the other has the breast 

 and sides uniformly black, but with the feathers broadly edged with 

 lighter, producing a dark slaty appearance, while the flanks are streaked 

 -with dusky. 



Measurements (in inches) : 



Alar ex- . 



Dendroica auduboni nigrifrons. Length, panse. Wing. Tail. 

 Average of nine adult males... 5.96 9.84 3.26 2.36 



Maximum 6.12 10.18 3.40 2.37 



Minmum 5.81 9.56 3.18 2.30 



Dendroica auduboni. 



Average of twelve adult males. .5.79 9.49 3.05 2.26 



Maximum 6.06 10. 3.30 2.37 



Minimum . . '. 5.62 9.06 2.94 2.25 



Dendrocia graciae Baird. Grace Warbler. 



Of very irregular occurrence; in the spring of 1902, I saw but a 

 single bird, whereas in the following year it was fairly abundant during 

 the spring migration. In 1896 it was still more abundant, and what is 

 rather unusual remained to breed in considerable numbers. The earliest 

 arrival noted was on April 12, 1903: they remained fairly numerous 

 throughout the month and disappeared about the first of May. A bird 

 of the pine woods, it was found almost exclusively in the higher moun- 

 tains, all that were taken being above 8000 feet, with the exception of a 

 few secured in the spring of 1896 as low as 6000 feet. In their travels 

 they associated with the other migrating warblers, particularly with 

 occidentalis and townscndi, and I found it by no means easy to distinguish 

 the various species in the tree tops ; though graciae acts more like a fly- 

 catcher than any of the others, constantly flying out from the trees to 

 a considerable distance after insects. Several juveniles were taken dur- 

 ing July, 1896; and in July and August, 1902, one immature and six 

 adults in fresh autumnal plumage were secured. A young male taken 

 July T3th is in the brown streaked plumage, but yellow feathers are be- 

 ginning to appear along the median line of the throat and upper breast, 

 and the yellow superciliary stripe is also beginning to show. Another, 

 a little older, has the streaks of the lower parts restricted to the sides 

 and flanks, and the yellow markings nearly perfect. A male taken on 

 July 30th, which has just discarded the juvenile for the winter plumage, 

 differs from the autumnal adults in having the white of the under pirts 

 more strongly tinged with buff; and whereas the adult has the back 

 decidedly streaked, though the markings are overcast by the brownish 

 edgings to the feathers, in the juvenile these markings are but imper- 

 fectly indicated. Autumnal adults have the upper parts overcast with 

 brown to such an extent, that except on the sides of the crown where a 

 little of the black shows through, the characteristic markings are en- 

 tirely hidden. Females are even more brown than the males, and have 

 the black streaks on the sides of the breast and flanks nearly concealed 

 as well. 



