438 



LIFE HISTORIES OF NORTH AMERICAN BIRDS. 



Poocmtes gramineus eonfinis, Western Vesper 

 Sparrow. 



Chondestes grammacus, Laik Sparrow. 



Chondestes grammacus strigatus. Western 

 Lark Sparrow. 



Zonotrichia leucophrys, Whiteerownecl Spar- 

 row. 



Spizella socialis, Chipping Sparrow. 



Spizella pusilla, Field Sparrow. 



Spizella pallida, Clay-colored Si>arrow. 



Junco hyemalis, Slate-colored Jiinco. 



Melospiza fasciata , Song Sparrow. 



Melospiza fasciata moniana, Mountain Song 

 Sparrow. 



Melospiza georgiana, Swamji Sparrow. 



Passerella iliaca schistacea, Slate -colored 

 Sparrow. 



Pipilo erythropMlialmus, Towliee. 



Gardinalis cardinalis, Cardinal. 



Habia ludoviciana, Rose-breasted Grosbeak. 



Ouiraca cwrulea, Blue Grosbeak. 



Fasserina cyanea, Indigo Bunting. 



Passerina amcena, Lazuli Bunting. 



Passerina ciris, Painted Bunting. 



Spiza amerioana, Dickcissel. 



Calamospiza melanocorys, Lark Bunting. 



Pirang'i erythromelas, Scarlet Tauager. 



Piranga rubra, Summer Tauager. 



Petrochelidon lionifrons, Cliff Swallow. 



Ampelis cedrorum, Cedar Waxwing. 



Vireo olivaceus, Red-eyed Vireo. 



Vireo gilvus, Warbling Vireo. 



Yireo 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, Prothouotary Warbler. 



Helmitherus vermivorus, Worm-eating War- 

 bler. 



Helmintliophila pinus, Blue- winged Warbler. 



Helminthophila chrysoptera, Golden-winged 

 Warbler. 



Helminthophila ruficapilla, Nashville War- 

 bler. 



Compsothlypis americana, Parula Warbler. 



Dendroica wstiva, Yellow Warbler. 



Dendroica cmrulescens. Black-throated Blue 

 Warbler. 



Dendroica cmrulea, Cerulean Warbler. 



Dendroica blaclcburniw, Blackburnian War- 

 bler. 



Dendroica virens, Black-throated Green War- 

 bler. 



Dendroica discolor, Prairie Warbler. 



Seiurus aurocapillus, Ovenbird. 



Seiurxis noveboracensis, Water Thrush. 



Seiurus motacilla, Louisiana Water Thrush. 



Oeothlypis formosa, Kentucky Warbler. 



Gcothlypis 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 carolinensis. Catbird. 



Harpoihynchus rufus. Brown Thrasher. 



Salpinctes ohsoletus. Rock Wren. 



Troglodytes wdon, House Wren. 



Parus bicolor, Tufted Titmouse. 



Polioptila cwrulea, Blue-gray Gnatcatcher. 



Turdus mustelinus. Wood Thrush. 



Turdus fuscescens, Wilson's Thrush. 



Turdus ustulatus swainsonii, Olive-backed 

 Thrush. 



Turdus aonalaschkce 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 

 intei-loper is rapid. Mr. M. A. White, of Mathews, Virginia, whose observations 

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



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



