438 



LIFE HISTORIES OF NORTH AMERICAN BIRDS. 



Poocwtrs (/ntniiiiciis eon finis. Western Vesper 

 Sparrow. 



Chondcstcs fframmacus, Lark Si)arrow. 



Ghotidestcs grammucus xtru/atus. Western 

 Lark Sparrow. 



Zonotrichia leucophryu, Whitecro\vue,<l Spar- 

 row. 



Spizella socialis, Chipping Si)arrow. 



Sj^hcUa jmnillaj Field Sparrow. 



Sj>!~cUa palliila, Clay-colored Sparrow. 



.htnco hi/cmalis, Slite-colored Junco. 



Mclospiza fasciata, Song Sparrow. 



Mcloftpka fasciatu montuva, Mountain Sony 

 Sparrow. 



Melospiza georgiana, Swamp Sparrow. 



Panserella iliaca schistacea, Slate - colore<l 

 Sparrow. 



Pipilo erythrophthalmus, Towliee. 



Cardinalis cardinaUs, Cardinal. 



Habia Indoviekina, Rose-breasted Grosbeak. 



Guiraca cwmlea, Blue Grosbeak. 



I'asserina cyanca, Indigo Bunting. 



Panserlna amwna, Lazuli Bunting. 



Passerina ciris, Painted Bunting. 



Spiza americana, Dickcissel. 



Calamospiza melanocorys, Lark Bunting. 



Piranyt crythromelas, Scarlet Tanager. 



Piranga rubra, Summer Tanager. 



Pctrochdidon limifrons, Cliff Swallow. 



Ainpelis cedrornm, Cedar Wax wing. 



Vireo oUvaccus, Red-eyed Vireo. 



Vireo gilvus, Warbling Vireo. 



Vireo flarifroufi, Yellow-throated Vireo. 



Vireo solitarins, Blue-headed Vireo. 



Vireo noveboracensis, White-eyed Vireo. 



Vireo belli, Bell's Vireo. 



Mniotilta varld, Black and White Warbler. 



Protonotaria citrea, Prothouotary Warbler. 



Helmitherus rermivorns, Worm-eating War- 

 bler. 



Hehnintliophila pimts. Blue-winged Warbler. 



Helm intlwphila chryf<optrra, Golden- winged 

 Warbler. 



Helminthophila ruficapilla, Nashville War- 

 bler. V 



Gompsothlypis americana, Parula Warbler. 



Jh'ndroica (estiva, Yellow Warbler. 



Dendroica ccerulesccns, Black-throated Blue 

 Warbler. 



Dcndroica cn'rnlea, Cerulean Warbler. 



Bendroica hlacMmrniw, Blackburniau War- 

 bler. 



Dendroica virens, Black-throated (ireen War- 

 bler. 



Dendroica discolor, Prairie Warbler. 



Seiurus aurocapillus, Ovenbird. 



Seiuriis noveboracensis. Water Thrush. 



Seiurus motacilla, Louisiana Water Thrush, 



Geothlypis formosa, Kentucky Warbler. 



Gcollilypis trichas, Maryland Yellowthroat. 



Geothlypis trichas occidentalis, Western Yel- 

 lowthroat. 



Icteria virens, Yellow-breasted Chat. 



Icteria virens longicaiida. Long-tailed Chat. 



Sylvania mitrata. Hooded Warbler. 



Setophaga ruticilla, American Redstart. 



GaJeoscoptcs carolinensis. Catbird. 



HarpoihynchHS rn/us. Brown Thrasher. 



Salpinctes obsoletns. Rock Wren. 



Troglodytes a'don. House Wren. 



Parus bicolor, Tufted Titmouse. 



Polioptila ccerulea, Blue-gray Gnatcatcher. 



Turdns mustelinus. Wood Thrush. 



Tiirdns fnscescens, Wilson's Thrush. 



Tardus ustulatus swainsonii, Olive-backed 

 Thrush. 



Tardus aonalaschlcw auduboni, Audubon's 

 Hermit Thrush. 



Merula migratoria, American Robin. 



Sialia siaiis. Bluebird. 



Ainoiiij;- the birds nieutioned above the nests of the Phoebe, Song- Sjiarrow, 

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

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

 parasitic eg-gs 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 tlie growth of the young 

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

 correspond fairlv well witli my own, writes on this subject as follows: 



" It was on the Oth of June, ISiJl, 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 



