28 Harlow, Breeding Birds of Penna. and N. J. [j^ 



throughout the mountains and also in Greene County. Data on seven 

 nests give: average set, 2; average date, May 28 (May 14, Pike Co., Pa.— 

 June 20, Greene Co.). 



62. Chordeiles virginianus virginianus. Nighthawk. — Locally 

 distributed throughout both states. Most common in parts of Berks 

 County, Pennsylvania. Nests regularly on the gravel rooves of houses 

 in Pittsburgh. Data on eight nests give: average set, 2; average date, 

 June 1 (May 24- June 29). 



63. Chsetura pelagica. Chimney Swift. — Abundant breeder through- 

 out both states. In the wilder regions it still sometimes nests in hollow 

 stumps and in Pike and Monroe Counties, Pa., I have found three nests 

 in dark barns. Data on twelve nests give: average set 4 (3-5); average 

 date, June 6 (May 24- July 15). 



64. Archilochus colubris. Ruby-throated Hummingbird. — Lo- 

 cally distributed; apparently most abundant in southern New Jersey, and 

 on the Pocono plateau and in Greene County, Pennsylvania. Data on 

 seventeen nests give: average set, 2; average date, — six nests southern 

 New Jersey, May 28, four nests southern Penna., June 1, seven nests, 

 northern Penna., June 7. 



65. Tyrannus tyrannus. Kingbird. — Common and generally 

 distributed. Data on thirty-five nests give: average set, 3 (4); average 

 date — 12 southern New Jersey nests, May 30, fourteen northern Penna. 

 nests, June 7. 



66. Myiarchus crinitus. Great Crested Flycatcher. — Common 

 though somewhat locally distributed and absent or very local in the moun- 

 tains. Data on twenty-six nests give: average set 5 (4-6); average date, 

 June 5 (May 26- June 24). 



67. Sayornis phoebe. Phosbe. — Abundant over the greater part 

 of both states but rather scarce in southern New Jersey especially in Cape 

 May County. Data on one hundred and seventy nests: average set, 5 

 (3-6) ; average date — first sets April 25 (earliest April 12) ; second sets, 

 June 8 (latest July 18). 



68. Nuttallornis borealis. Olive-sided Flycatcher. — A very 

 rare summer resident in the boreal regions of Pennsylvania. I have found 

 it only in Pike, Wayne, Monroe and Warren Counties. A set of two eggs 

 in my collection was taken at Warren, June 24, 1904. 



69. Myiochanes virens. Wood Pewee. — Very common and gener- 

 ally distributed. Data on fourteen nests give : average set, 2 or 3; aver- 

 age date, June 10 (June 3-August 1). 



70. Empidonax flaviventris. Yellow-bellied Flycatcher. — I 

 have one summer record of this species for Warren County, Pa., and two 

 for Monroe. It has been found nesting by others (see Auk, 1916, p. 200). 



71. Empidonax trailli alnorum. Alder Flycatcher. — I have 

 found the Alder Flycatcher in summer only at Cresco and Pocono Lake, 

 Monroe County and Gouldsboro, Wayne County, Pennsylvania. (For 

 record of nests see Auk, 1916, p. 199). 



