438 



LIFE HISTOEIES OF NORTH AMERICAN BIRDS. 



Pooccetes gramineus confinis, Western Vesper 

 Sparrow. 



Chondestes grammacus, Lark Sparrow. 



Chondestes grammacus strigatus, Western 

 Lark Sparrow. 



Zonotrichia leucophrys, White-crowned Spar- 

 row. 



Spizella socialis, Chipping Sparrow. 



Spizella. pusilla, Field Sparrow. 



Spizella pallida, Clay-colored Sparrow. 



Junco hyemalis, Slate-colored Jnnco. 



Melospiza fasciata, Song Sparrow. 



Melospiza fasciata montana, Mountain Song 

 Sparrow. 



Melospiza georgiana, Swamp Sparrow. 



Passerella iliaca schistacea, Slate - colored 

 Sparrow. 



Pipilo erythrophthalmus, Towhee. 



Cardinalis cardinalis, Cardinal. 



Habia ludoviciana, Rose-breasted Grosbeak. 



Guiraca cwrulea, Blue Grosbeak. 



Passerina cyanea, Indigo Bunting. 



Passerina amcena, Lazuli Bunting. 



Passerina ciris, Painted Bunting. 



Spiza americana, Dickcissel. 



Calamospiza melanocorys, Lark Bunting. 



Pirangi erythromelas, Scarlet Tanager. 



Piranga rubra, Summer Tanager. 



Petrochelidon lunifrons, Cliff Swallow. 



Ampelis cedrorum, Cedar Waxwing. 



Vireo olivaeeus, Red-eyed Vireo. 



Vireo gilvus, Warbling Vireo. 



Vireo flavifrons, Yellow-throated Vireo. 



Vireo solitarius, Blue-headed Vireo. 



Yireo noveboracensis, White-eyed Vireo. 



Vireo belli, Bell's Vireo. 



Mniotilta varia, Black and White Warbler. 



Protonotaria citrea, Prothonotary Warbler. 



Helmitherus vermivorus, Worm-eating War- 

 bler. 



Helminthophila pinus, Blue-winged Warbler. 



Helminthophila chrysoptera, Golden-winged 

 Warbler. 



Helminthophila ruficapilla, Nashville War- 

 bler. 



Gompsothlypis americana, Parula Warbler. 



Dendroica wstiva, Yellow Warbler. 



Dendroica cwruleseens, Black -throated Blue 

 Warbler. 



Dendroica cwrulea, Cerulean Warbler. 



Dendroica blacliburniw, Blackburnian War- 

 bler. 



Dendroica virens, Black-throated Green War- 

 bler. 



Dendroica discolor, Prairie Warbler. 



Seiurus aurocapillus, Ovenbird. 



Seiurus noveboracensis, Water Thrush. 



Seiurus motacilla, Louisiana Water Thrush. 



Geothlypis formosa, Kentucky Warbler. 



Geothlypis trichas, Maryland Yellowthroat. 



Geothlypis trichas occidentalis, Western Yel- 

 lowthroat. 



Icteria virens, Yellow-breasted Chat. 



Icteria virens longicauda, Long-tailed Chat. 



Sylvania mitrata, Hooded Warbler. 



Setophaga ruticilla, American Redstart. 



Galeoscoptes carolinerisis, Catbird. 



Harpoi hynchus rufus, Brown Thrasher. 



Salpinctes obsolctus, Rock Wren. 



Troglodytes cedon, House Wren. 



Parus bicolor, Tufted Titmouse. 



Polioptila cwrulea, Blue- gray Guatcatcher. 



Turdus mustelinus, Wood Thrush. 



Turdus fuscescens, Wilson's Thrush. 



Turdus ustulatus swainsonii, Olive-backed 

 Thrush. 



Turdus aonalaschlcw auduboni, Audubon's 

 Hermit Thrush. 



Merula migratoria, American Robin. 



Sialia sialis, Bluebird. 



Among the birds mentioned above the nests of the Phoebe, Song' Sparrow, 

 Towhee, Indigo Bunting, Ovenbird, and Yellow-breasted Chat seem to be most 

 frequently selected by the Cowbird, and these usually contain also more of the 

 parasitic eggs than the majority of the others. 



The egg of the Cowbird usually hatches in from ten to eleven days, gen- 

 erally in advance of those of the foster parent, and the growth of the young 

 interloper is rapid. Mr. M. A. White, of Mathews, Virginia, whose observations 

 correspond fairly well with my own, writes on this subject as follows: 



" It was on the 9th of June, 1891, that I placed a fresh egg of the Cowbird 

 in the nest of a Chipping Sparrow containing two of her own that had an 

 advance of one and a half days' incubation. I watched results. About the 19th 



