104 U.S. NATIONAL MUSEUM BULLETIN 233 



files of the U.S. Fish and Wildlife Service — were reported by H. Lacey 

 from his ranch at Turtle Creek, Kerr County, Texas: on June 14, 1900, 

 two warblers were seen feeding a young cowbird in a wall nest near a 

 house (a very young golden-cheeked warbler in the same tree probably 

 was reared with the cowbird although the adult warblers were not 

 seen actually to feed it); on May 15, 1905, a nest with 2 eggs of the 

 warbler and 1 of the cowbird was found; on April 26, 1915, another 

 nest with similar contents was discovered. Brewster (1879, pp. 77- 

 79), reporting on Werner's data from Comal County, Texas, mentions 

 a nest with 3 eggs of the warbler and 1 of the cowbird. A few days 

 earlier, the same collector had seen a pair of golden-cheeked warblers 

 with a brood of fledglings, among which were young cowbirds. Nye 

 (in Htt.) collected a set with 1 egg of this warbler plus 3 of the dwarf 

 race of the cowbird. 



Hermit Warbler 



Dendroica occidentalis (Townsend) 



It is not possible to estimate the relations between the hermit war- 

 bler and the brown-headed cowbird. Not only is the former a seldom 

 studied species, but also only a single instance of cowbird parasitism 

 has been reported. Reynolds (1942, p. 28) saw a fledghng cowbird 

 (race obscurus) being attended and fed by a pair of hermit warblers at 

 Camp Augusta, three miles from Nevada City, California, on June 2 1 , 

 1942. 



Cerulean Warbler 



Dendroica cerulea (Wilson) 



The cerulean warbler is an uncommon victim of the brown-headed 

 cowbird. Because it builds high in trees, its nests rarely are discovered. 

 While this fact may tend to keep down the recorded number of in- 

 stances of cowbird parasitism, enough nests have been collected over 

 the years to make meaningful the paucity of cowbird records. Only 12 

 instances have been noted. They are distributed from Ontario to 

 Michigan, Indiana, New York, Pennsylvania, and Virginia. Samiders 

 (1900, p. 361) reported two parasitized nests from western Ontario. 

 The late J. P. Norris informed me many years ago that there were 

 three parasitized sets of eggs from Ontario in his collection, but 

 whether these included any of those listed by Saunders is not clear. 

 Dickey (1912, p. 302) noted a case in Greene County, Pennsylvania. 

 In the Bent collection in the U.S. National Museum there is a para- 

 sitized set collected at Tonawanda Swamp, New York, on June 1, 1900. 

 In the same collection there are two similar sets — one from Saginaw, 

 Michigan, taken by R. A. Brown, on June 23, 1900, and one from 

 Beaver County, Pennsylvania, collected by W. E. C. Todd. FHnt 

 (1892) recorded a set of eggs of the cerulean warbler with a cowbird's 



