Vol 'l9^ XY ] Harlow, Breeding Birds of Penna. and N. J. 143 



133. Dendroica fusca. Blackburnian Warbler. — Nests in the 

 mountainous regions of Pennsylvania from Huntington County north to 

 Warren and Pike, most common northward. I consider its nest the hardest 

 to find of all our nesting birds. Data on seven nests give: average set, 

 3 or 4; average date, June 1 (May 26-June 29). 



134. Dendroica virens. Black-throated Green Warbler. — Same 

 range as the preceding, though strange as it may appear, it seems to be more 

 common in Fayette and Huntington Counties than farther north where the 

 Canadian element is more predominant. Data on eight nests give: 

 average set, 4 (sometimes 3); average date, June 1 (May 24- July 6). 



135. Dendroica vigorsii. Pine Warbler. — Common in summer 

 throughout the pine barrens of southern New Jersey. In Pennsylvania it 

 is a rare or local summer resident in the following counties. Huntington, 

 Mifflin, Center, Lycoming, Snyder, Warren, Wayne, Monroe and Pike. 

 On May 14, 1914, I found a nest almost completed in northern Hunting- 

 ton County. 



136. Dendroica discolor. Prairie Warbler. — Breeds abundantly 

 throughout southern New Jersey but I have not found it in summer else- 

 where. Data on five nests give: average set, 4 (sometimes 3), average 

 date, May 26. 



137. Seiurus aurocapillus. Ovenbird. — Breeds commonly and 

 generally through both states. Data on twenty-two nests give: average 

 set, 4 or 5 (sometimes 3); average date, May 25 (May 16-June 28). 



138. Seiurus noveboracensis noveboracensis. Water-Thrush. — 

 A rare breeder in Warren, Clinton, Sullivan and Cambria Counties and 

 common in the most impenetrable Rhododendron swamps of Wayne, 

 Monroe and Pike Counties on the Pocono plateau. I have never found 

 this bird along running streams but always in the swamps where moss 

 covered logs and standing pools of water abound. The nest is very hard 

 to discover. Data on six nests give average set, 4 (3-5), average date, 

 May 26 (May 20- June 6). 



139. Seiurus motacilla. Louisiana Water-Thrush. — A rare 

 breeder in southern New Jersey (see Auk, January 1912, p. 105). In Penn- 

 sylvania it is rare in the southeastern counties but common along the 

 lower Susquehanna, in Greene County in the southwest, and in Alleghany 

 County. It is also common along the mountains of Center, Huntington 

 and Mifflin Counties where I have found a number of nests, and over the 

 Pocono plateau in Wayne, Monroe and Pike Counties in the same sec- 

 tion inhabited by the other species but unlike it always frequenting the 

 cool swift running mountain streams. Data on thirty nests give: average 

 set, 5 (3-6), average date, May 12 (April 26-June 16). 



140. Oporornis formosa. Kentucky Warbler. — I have but one 

 record of the Kentucky Warbler summering in southern New Jersey (see 

 Stone's ' Birds of New Jersey '). In Pennsylvania it is a typical Carolinian 

 species restricted to the southeastern and southwestern counties. Data 

 on thirty-two nests give: average set, 5 (3-6); average date, May 25 

 (May 18-June 22). 



