112 The Ornithology of Chester County 



ant, transient. 



Spring arrival — ^Apr. 9 (1905) — ^Apr. 28 

 (1911) ; ave. 8 yrs. Apr. 19. 



Spring departure — Apr. 27 (1900) — May 12 

 ( 1907 ) ; ave. 6 yrs. May 4. 



Fall arrival — Sept. 12 (1913) — Oct. 8 (1915)^ 

 ave. 8 yrs. Sept. 26. 



Fall departure — Oct. 9 (1890) — Nov. 14 

 (1903) ; ave. 19 yrs. Oct. 26. 



246. Planestictts tnigratorius migratorius Robin, 

 "redbreast," "robin," "robin-redbreast." Abundant 

 summer resident; occasional resident. Nidification 

 usually commences by April 27, and nest is com- 

 pleted by April 30. 



Berwyn: 



Arrival — Feb. 7 (1912)— -Mar. 17 <i888) ; ave. 



32 yrs. Mar. 2. 



Common — Feb. 21 (1906) — ^Apr. 5 (1895) ; ave. 



33 yrs. Mar. 14. 



Bulk departure — Oct. 7 (1903) — Nov. 5 

 (1907) ; ave. 27 yrs. Oct. 24. 



Last seen — Oct. 27 (1915) — Dec. 3 (1891); 

 ave. 33 yrs. Nov. 11. 



247. Sialia Sialis sialis Bluebird. Tolerable com- 

 mon summer resident ; occasional resident. Nidifica- 

 tion begins about April 15 ; complete set April 30. 



Berwyn : 



Arrival — ^Jan. 17 (1901) — Mar. 25 (1912); 

 ave. 33 yrs. Feb. 19. 



Common — Jan. 30 (1892) — Apr. 28 (1911); 

 ave. 29 yrs. Mar. 2. 



Bulk departure — Oct. 7 (191 5) — Nov. 15 



