V ° I lS08 XV ] Harlow, Breeding Birds of Penna. and N. J. 141 



though not common breeder in Erie County, Pennsylvania, but not known 

 elsewhere except as a migrant. Data on two nests are: 1, East Springfield, 

 Pa., May 8, 1915, four eggs; 2, East Springfield, Pa., May 9, 1915, five eggs. 



117. Vireosylva olivacea. Red-eyed Vireo. — One of the most 

 abundant breeding birds of the woodland. Data on forty-eight nests give: 

 average set, 3 (2-4); average date, June 6 (May 26- June 14). 



118. Vireosylva gilva gilva. Warbling Vireo. — In New Jersey I 

 have found this species nesting only along the Delaware from Trenton to 

 Belvidere. In Pennsylvania it is very local except in the northern and 

 mountainous districts, where it is not found at all. Data on five nests give: 

 average set, 3 or 4; average date, Greene County, May 22; Center County, 

 May 28. 



119. Lanivireo flavifrons. Yellow-throated Vireo. — I have not 

 found this Vireo nesting in southern New Jersey but from Camden north 

 it is a regular breeder. In Pennsylvania it is a rather scarce though regular 

 breeding bird throughout the state, although contrary to the statement in 

 Stone's ' Birds of Eastern Pennsylvania and New Jersey,' I have found it 

 more commonly in the southern portion. Data on eight nests from Phila- 

 delphia, Montgomery, Center and Warren Counties give: average set, 4 

 (sometimes 3) ; average date, June 4, earliest May 23. 



120. Lanivireo solitarius solitarius. Blue-headed Vireo. — A 

 regular and fairly common breeder in the northern and mountainous parts 

 of Pennsylvania from Pike and Warren Counties south to Huntington, 

 breeding as near Philadelphia as the Delaware Water Gap. Data on nine 

 nests give: average set, 4 (sometimes 3); average date, June 4 (May 15- 

 July2). 



121. Vireo griseus griseus. White-eyed Vireo. — Very common in 

 the Cedar swamps of southern New Jersey but in Pennsylvania I have found 

 it only as a rather scarce breeder in parts of Delaware and Chester Counties. 

 A set of four eggs was taken in Cape May County, May 23, 1908. 



122. Mniotilta varia. Black and White Warbler. — Breeds regu- 

 larly throughout both states but very scarce in southeastern Pennsylvania; 

 most plentiful in the mountains. Data on twelve nests give: average 

 set, 5 (3-4); average date, May 20 (May 14-June 10). 



123. Helmitheros vermivorus. Worm-eating Warbler. — I have 

 never found this species in southern New Jersey. In Pennsylvania it 

 breeds in Chester, Delaware and Bucks Counties and rarely in Philadelphia 

 also in Greene and Alleghany in the western part of the state. It is a Caro- 

 linian species but pushes up the valleys to laurel covered hillsides well into 

 the mountains, and I have found it breeding in Huntington and southern 

 Center Counties, in the same ravines with the Canadian and Black-throated 

 Blue Warblers. Data on thirteen nests give: average set, 5 (3-6); aver- 

 age date, for eastern Pennsylvania (5 nests), May 30; for Center County 

 (3 nests), May 26; for Greene County (5 nests), May 25. 



124. Vermivora pinus. Blue-winged Warbler. — In southern New 

 Jersey I have found this bird but three times in the breeding season, once 



