V0L 1926 XVI1 ] Wetmore, Birds of Lake Burford, N. Mez. 409 



87. Vermivora celata celata (Say). Orange-crowned Warbler. — 

 This Warbler nested in small numbers in the gulches below the lake. 

 Apparently it was a late migrant as it was not observed until June 2, 

 when a female was collected in a grove of quaking aspens. On June 9 

 a male was encountered on an oak-grown hillside over which small Yellow 

 Pines and Douglas Firs were distributed. This bird was rather inactive 

 and often flew up into trees, usually conifers, to remain quiet and sing 

 from some hidden perch. Once or twice while under observation it stopped 

 to rest in the sun on a dead limb. The song, given constantly ,was a rapid 

 hurried trill, resembling the syllables tsee-ee-ee-ee-er-er-er. 



88. Dendroica aestiva (Gmelin). Yellow Warbler. — This warbler 

 apparently was found at the lake only as a migrant, though it nested 

 along the Brazos River farther east. Single individuals were observed 

 along the lake shore on May 23 and June 1 in willows and small cotton- 

 woods. No specimens were taken. 



89. Dendroica auduboni auduboni (J. K. Townsend). Audubon's 

 Warbler. — This warbler nested in fair numbers in the Yellow Pine areas 

 surrounding the lake. Males were found singing from the tops of the 

 tallest Pines and were slow and leisurely in their movements in great con- 

 trast to their habit at other seasons. Frequently while singing they 

 remained on one perch for some time so that often it was difficult to find 

 them. The song resembled the syllables tsil tsil tsil tsi tsi tsi tsi. In a 

 way it was similar to that of the Myrtle Warbler but was louder and 

 more decided in its character. 



90. Dendroica graciae Baird. Grace's Warbler. — A small number 

 of Grace's Warblers were encountered at the head of one of the gulches 

 east of the lake, first on June 9, and again on June 16. Males only were 

 observed. In actions and general appearance they reminded me strongly 

 of Dendroica dominica. Usually they were found in the tops of the Yellow 

 Pines where they worked about rather leisurely, exploring the smaller 

 limbs and at short intervals pausing to sing. The song was a rapid repe- 

 tition of notes somewhat reminiscent of the efforts of the Chipping Spar- 

 row, but with the notes evenly spaced, not blurred at the end, and closing 

 abruptly, so that the last syllable was as strongly accented as any of the 

 others. It resembled the syllables chip chip chip chip chip given in a loud 

 tone. Occasionally one was found working about through the oak under- 

 growth at times coming down almost to the ground. The flight was 

 undulating and rather quick and jerky. 



Grace's Warblers showed some curiosity toward me but in the thick 

 brush it was difficult to follow them about. The callnote was a very 

 faint tsip that carried only a few feet at best, and was so weak and soft 

 that it was hard to locate the direction from which it came, so that birds 

 that could not be found were heard often among the oaks. 



91. Seiurus noveboracensis notabilis Ridgway. Grinnell's Water 

 Thrush. — One of these birds was observed at the spring near the cotton- 

 woods on May 23 and 25. 



