Annotated List 85 
Arrival—Mar. 27 (1913)—Apr. 30 (1905); 
ave. 13 yrs. Apr. 18. 
Common—Apr. 18 (1889)—May 4 (1901); 
ave. 5 yrs. Apr. 28. 
Departure—Aug. 18 (1900)—Sept. 24 (1896) ; 
ave. 7 yrs. Aug. 26. 
169. Petrochelidon lunifrons lunifrons Cliff Swal- 
low, “barn swallow,” “eave swallow,” ‘mud swal- 
low.” Not common transient, and rather rare and 
altogether local summer resident ; formerly consider- 
ed common. Pennock states that four or five sta- 
tions about Kennett Square and one at Lenape are 
deserted (Cass., vi, 52); Sharples remembers a 
colony in 1870 on the S. E. wall of an old mill at 
Milltown, near West Chester; and Wilson reports 
that in 1880, fifteen or sixteen pairs came to an old 
stone building on the mill property of David Y. 
Wilson, West Marlborough Twp., and built their 
nests for three or four years. A set of five eggs was 
taken near Berwyn, July 25, 1896. Warren states 
that it arrives Apr. 28 to May 3. 
170. Hirundo erythrogastra Barn Swallow. Com- 
mon summer resident, less commonly than formerly 
however. Completed nests by May 13. 
Berwyn: 
Arrival—Apr. 13 (1912)—May 3 (1907) ; ave. 
25: yrs... Apr. 22: 
Common—Apr. 15 (1912)—May 9 (1904); 
ave. 23 yrs. Apr. 28. 
Departure—Aug. 19 (1898)—Sept. 11 (1902); 
ave. 7 yrs. Aug. 29. 
171. Iridoprocne bicolor Tree Swallow, “white- 
