438 



LIFE HISTOEIES OF NORTH AMBEICAN BIRDS. 



Poocwtcs fjramincns confiyiis, Western Yesper 

 Sparrow. 



Chondestes grammacus, Lark Sparrow. 



Chondestes grammacus strigatus. Western 

 Lark Sparrow. 



Zonotriohia leuoophrys, White- crowned Spar- 

 row. 



Spizella socialis, Chipping Sparrow. 



Spizella pusilla, Field Sparrow. 



Spizella pallida, Clay-colored Sparrow. 



Junco hyemalis, Sliite-colored Junco. 



Melospiza fasciata, Song Sparrow. 



Melospiza fasciata montana, Mountain Soug 

 Spa.rrow. 



Melospiza georgiana, Swamp Sparrow. 



Passerella iliaca schistaeea. Slate -colored 

 Sparrow. 



Pipilo erythrophthalmus, Towhee. 



Gardinalis cardinalis, Cardinal. 



Sdbia ludoviciana, Rose-breasted G-rosbeak. 



Guiraca cmridea, Blue Orosbeak. 



Passerina cyanea, Indigo Bunting. 



Passerina amwna, 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 olivaceus, Red-eyed Vireo. 



Vireo gilvus, Warbling Vireo. 



Vireo flavifrons, Yellow-throated Vireo. 



Vireo soUtarius, Blue-headed Vireo. 



Vireo noveboracensis, White- eyed Vireo. 



Vireo belli, Bell's Vireo. 



Mniotilta varia. Black and White Warbler. 



Protonotaria citrea, Prothonotary Warbler. 



Helmitlierus vermivorus, Worm-eating War- 

 bler. 



Eelminthophila pinus, Blae-winged Warbler. 



HelminthopMla chrysoptera, Golden-winged 

 Warbler. 



HelminthopMla ruficapilla, ^Nashville War- 

 bler. 



Gompsothlypis americana, Parula Warbler. 



Dendroica cestiva, Yellow Warbler. 



Bendroica cwrulescens, Black-throated Blue 

 Warbler. 



Dendroica ccerulea, Cerulean Warbler. 



Dendroica blaelcburniw, Blackburnlan 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. 



Oeothlypis formosa, Kentucky Warbler. 



Geothlypis trichas, Maryland Yellowthroat. 



Geothlypis trichas ocoidentalis. Western Yel- 

 lowthroat. 



Icteria virens, Yellow-breasted Chat. 



loteria virens longicauda, Long-tailed Chat. 



Sylvania mitrata. Hooded Warbler. 



Setophaga ruticilla, American Redstart. 



Galeoscoptes carolinensis. Catbird. 



Harpoi hynchus rufus. Brown Thrasher. 



Salpinctes obsoletus. Rock Wren. 



Troglodytes rndon, House Wren. 



Parus bicolor. Tufted Titmouse. 



Polioptila ccerulea, Blue-gray Gnatcatcher. 



Turdus mustelinus, Wood Thrush. 



Turdus fuscescens, Wilson's Thrush. 



Turdus ustulatus swainsonii, Olive-backed 

 Thrush. 



Turdus aonalaschkw 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 



