144 Harlow, Breeding Birds of Penna. and N. J. [April 



141. Oporornis Philadelphia. Mourning Warbler. — Breeds regu- 

 larly in Warren County and I have found them summering regularly 

 but not commonly on parts of Sullivan, Pike and Monroe Counties. A set 

 of five eggs in my collection was taken in Warren County, June 9, 1911. 



142. Geothlypis trichas trichas. Maryland Yellow-throat. — 

 Breeds commonly throughout; from the coast islands of New Jersey to the 

 tops of the Alleghanies. Data on twenty-one nests give: average set, 4 

 (3-5) ; average date, May 28 for first sets, earliest May 19; for second sets, 

 July 5, latest July 17. 



143. Icteria virens virens. Yellow-breasted Chat. — A common 

 breeder throughout New Jersey, being abundant in suitable localities in the 

 southern counties. In Pennsylvania it is a common summer resident in the 

 Carolinian fauna of the southern part of the state pushing north into Center 

 County, where however, it is rare. It pushes up into mountain clearings 

 as the forest disappears and I have found it in Pike, Wayne and Sullivan 

 Counties, and in 1917 found a pair breeding on the very summit of Bald 

 Knob, one of the highest mountains in Central Pennsylvania. Data on 

 thirty-eight nests give: average set, 4 (3-5); average date, May 28 (May 

 20-June25). 



144. Wilsonia citrina. Hooded Warbler. — Breeds commonly in 

 the swamps of southern New Jersey. It is especially common in Cape May 

 and Cumberland Counties and I have found it nesting as near to Phila- 

 delphia as Clementon, in 1915. In Pennsylvania it nests commonly in 

 the Rhododendron and Laurel thickets of Franklin, Center, Huntington 

 and Mifflin Counties and less frequently in Snyder and Juniata Counties. 

 I have also found it present in the breeding season though rare, in Clinton, 

 Lycoming and Warren where the fauna is pronouncedly Canadian. Data 

 on twelve nests give: average set, 4 (3-5); average date, for four New 

 Jersey nests, May 24; for eight Pennsylvania nests, June 1. 



145. Wilsonia canadensis. Canada Warbler. — Breeds regularly 

 in the mountains of Pennsylvania from Fayette, Junaita and Huntington 

 Counties to Warren and Pike. Nowhere have I found it more abundant 

 than in northern Huntington and southern Center Counties. Data on 

 fifteen nests give: average set, 5 (sometimes 4); average date, May 27 

 (May 23- June 25). 



146. Setophaga ruticilla. Redstart. — Breeds regularly but not 

 commonly in southern New Jersey from Ocean to Cape May Counties and 

 more commonly from Belvidere northward along the Delaware. In Penn- 

 sylvania I have found it nesting along the Pennypack Creek near Phila- 

 delphia, where however it is rare. In the southeastern and southwestern 

 sections it is rare and local and very scarce in the central parts of the state. 

 In the northeast — Wayne, Monroe and Pike Counties — it is more plentiful 

 but local as it is also in Warren County. Data on nine nests give: average 

 set, 4 (3-5); average date, May 30 (May 24- June 19). 



147. Mimus polyglottos polyglottos. Mockingbird. — On May 9, 

 1914, I saw a Mockingbird near Waynesburg, Greene County, Pa., and was 



