THE OOLOGIST 



69 



lay its eggs. Certainly a low record 

 in a locality where the Cowbird is 

 supposed to be a common breeder. 

 And during 1913 I did not see a Cow- 

 bird in the nesting season or find any 

 of its unwelcome eggs or young in the 

 many bird's nests I examined. 



I record below the few Cowbird's 

 eggs and young I have found in bird's 

 nests in the vicinity of Philadelphia 

 and shall have more to say in regard 

 to several in another paper. It will 

 be noticed, however, that I have never 

 found more than one Cowbird's egg 

 or young bird in a nest. 



1. June 12, 1897; Holmesburg, Phil- 

 adelphia County, Pa. — One fresh egg 

 in Red-eyed Vireo's nest containing 

 one fresh egg of the owner. 



2. May 19, 1898; Gloucester Coun- 

 ty, N. J. — One fresh broken egg in a 

 Brown Thrasher's nest (Oologist, 1912, 

 p. 261). 



3. May 25, 1898, Blue Grass, Phila- 

 delphia County, Pa. — One half incu- 

 bated egg in Song Sparrow's nest con- 

 taining two eggs of the ownier, both 

 also half incubated. 



4. June 13, 1898, Frankford, Phila- 

 delphia County, Pa. — One half incu- 

 bated egg in Red-eyed Vireo's nest 

 containing three half incubated eggs 

 of the owner. 



5. June 1, 1899, Sandiford, Philadel- 

 phia County, Pa. — One fresh egg in 

 White-eyed Vireo's nest containing 

 three fresh eggs of the owner. 



6. June 9, 1899, Sandiford, Philadel- 

 phia County, Pa. — One fresh egg in 

 Red-eyed Vireo's nest containing three 

 fresh eggs of the owner. 



7. May 26, 1900. Sandiford, Philadel- 

 phia County, Pa. — One fresh egg in 

 Wood Thrush's nest containing four 

 fresh eggs of the owner. 



8. June 16, 1900, Holmesburg, this 

 county. — One one-third incubated egg 

 in Red-eyed Vireo's nest containing 

 two eggs of the owner about the same 

 in incubation. 



9. June 23, 1900, Holmesburg, same 

 county. — One fresh egg in Red-eyed 

 Vireo's nest containing three fresh 

 eggs of the owner. 



10. June 28, 1900, Holmesburg, same 

 county. — One fresh egg in Red-eyed 

 Vireo's nest containing three fresh 

 eggs of the owner. 



11. May 7, 1901, Blue grass, Phila- 

 delphia County, Pa. — One fresh egg in 

 Phoebe's nest containing one egg of 

 the owner, which contained a tiny 

 puncture. 



12. May 28, 1901, Valley Falls, Mont- 

 gomery County, Pa. — One fresh egg in 

 Indigo Bunting's nest containing three 

 fresh eggs of the owner. 



13. May 31, 1901, Frankford, Phila- 

 delphia County, Pa. — One fresh punc- 

 tured egg in empty Indigo Bunting's 

 nest (Oologist, 1912, p. 261). 



14. May 31, 1901, Frankford, same 

 county. — One fresh egg in Wood 

 Thrush's nest containing three fresh 

 eggs of the owner. 



15. May 31, 1901, Frankford, same 

 county. — One fresh egg in Indigo Bunt- 

 ing's nest containing two fresh eggs 

 of the owner, one with a small punc- 

 ture. 



16. July 11, 1901, Frankford, same 

 county. — One fresh egg in Red-eyed 

 Vireo's nest containing three fresh 

 eggs of the owner. 



17. July 11, 1901. Same locality as 

 above. — One half-grown young in Red- 

 eyed Vireo's nest containing two 

 young of the owner, one, half and the 

 other about one-third grown and not 

 half as big as the hoggish Molothrus 

 which I removed. 



18. May 12, 1902. Wissinoming, Phil- 

 adelphia County, Pa. — One egg, incu- 

 bation begun, in Cardinal's nest con- 

 taining three eggs of the owner about 

 the same in incubation. 



19. May 20, 1902, same locality as 

 last. — One fresh egg in an empty and 

 deserted Yellow Warbler's nest, part- 



