68 PROCEEDINGS OF 7THE ACADEMY OF 



blended, black lines. The iris, bill and feet are black ; the soles of the latter 

 dirty yellow. 



Young of the year. The slate gray of the upper parts is strongly tinged with 

 olivaceous, least marked on the rump. The black streaks of the crown and 

 interscapular region are so obsolete as to be scarcely discernible. The yellow 

 of the head and throat has about the same extent as in the adult, but the 

 tint is much paler, and it is not edged along the sides of the breast and neck 

 by black streaks. The black lores are poorly defined. The white tips of the 

 greater and median wing coverts are grayish rather than pure white. 

 The strongly defined, black, lateral streaks of the adult are replaced by more 

 or less obsolete and semiconfluent, brownish black ones, and the abdomen, 

 crissum and circumanal region are rather ochraceous than pure white. The 

 bill and feet are lighter colored. The white on the tail feathers does not dif- 

 fer materially from that of the adults. Between the extremes of color, as 

 thus characterized, are to be found every gradation in amount of slatiness and 

 olivaceous, of distinctness of the black lateral streaks, and intensity of 

 yellow. 



Variations. In a series of over twenty specimens of all ages and seasons, I 

 find examples varying from 4'9 to 5-20 in length, and to a corresponding de- 

 giee in extent of wings. The average dimension is 5*00 X 8-00 X 2*60. In- 

 dividuals of the same age and season hardly vary appreciably in color ; some- 

 times the black streaks of the crown show a tendency to become segregated on 

 each side as a margin to the superciliary streak, leaving the centre of the 

 crown immaculate, or the black may occupy the whole crown almost to the 

 exclusion of the greyish slate. The yellow and white are alwnys trenchantly 

 separated on the breast, and a black border always divides the yellow chin 

 from the yellow on the side of the head. The interscapular region may vary 

 in its amount of streaking. The greater coverts are sometimes edged, as well 

 as tipped with dull white. 



Remarks. D. Gracice is exceedingly unlike any other North American 

 warbler. Its upper parts bear a striking resemblance to those of Myiodioctes 

 canadensis. It agrees with dominica (= superciliosa) in the yellow throat, 

 but is otherwise quite different from that species. It is closely allied to Baird's 

 new Porto Rican species, D. Adf-lu'da-, but this latter has the yellow extended 

 over the whole under parts, and otherwise differs materially in some points of 

 form as well as color. 



Habitat. First met with July 2, 1864, in the pine woods covering the sum- 

 mit of Whipple's Pass of the Rocky Mountains. I saw no more on my journey 

 into Central Arizona, till again among pines at Fori Whipple, where it is a 

 very common bird, being in fact as abundant as virens or striata in our eastern 

 forests. It will doubtless be found in the forests of the San Francisco Mount- 

 ains. Its range seems to include all the pine tracts of New Mexico and Arizo- 

 na, from near the Valley of the Rio Grande to that of the Great Colorado. It 

 breeds about Whipple ; how far south it may go in winter into Mexico I am 

 unable to say. 



Arrives at Fort Whipple Apr. 20, and remains until third week in September. 

 Almost exclusive'y pinicoline. An active, industrious, noisy species, posses- 

 sing marked muscicapine habits, Hying out from its perch to capture passing 

 insects. Like many other diminutive birds, it ambitiously prefers to inhabit 

 the tallest trees. It has several notes, one of which is the ordinary "tsip," 

 emitted at all times by both old and young of most small insectivorous birds. 

 Its song proper, only heard in spring, consists of two or three loud, sweet 

 whistles, somewhat slurred, followed by several continuous notes resembling 

 " chir-r-r " in a wiry but clear tone. T^liis note is of much power for the size 

 of the bird. Another song, uttered when pairing, is much like that of Seto- 

 l>ha(ja ruticilla. The birds mate as early as May 1st, and doubtless raise two 

 broods, as I have found newly Hedged young as late as the middle of August. 



[.March, 



