78 The Ornithology of Chester County 
Departure—Mar. 16 (1901 )—Apr. 21 (1887); 
ave. 17 yrs. Apr. 9. 
152. Spizella passerina passerina Chipping Spar- 
row, “bush sparrow,” “chippy,” “chip sparrow,” 
“hairbird,” “honeysucklebird,”’ ‘house sparrow,” 
“tit,” “tree sparrow.” Abundant summer resident. 
Nidification commences May 5; average date for 
complete set, May 15. 
Berwyn: 
Arrival—Mar. 2 (1909)—Apr. 18 (1891) ; ave. 
32 yrs. IMiar: 30; 
Common—Mar. 29 (1907-1914)—Apr. 29 
(1891) ; ave. 29 yrs. Apr. I0. 
Bulk departure—Sept. 20 (1906)—Oct. 21 
(1,002 )); ave. 8! yxs.)'Oct.:8: 
Last. seen—Sept. 29 (1898)—Oct. 28 (1891); 
ave Ig yrs. Oct. 74. 
153. Spizella pusilla pusilla Field Sparrow, 
“bush sparrow,” “field chippy,” ‘field sparrow,” 
“ground chippy.’”’ Abundant summer resident, oc- 
casional resident. Average date for set of eggs, May 
18. 
Berwyn: 
Arrival—Mar. 6 (1906)—Apr. 15 (1887) ; ave. 
30° yrs. Mar. 29: 
Common—Mar. 24 (1903)—Apr. 29 (1891); 
ave. 30 yrs. Apr. 5. 
Bulk departure—Sept. 26 (1904)—Oct. 23 
(1895); ave. 13) yrs. Oct:) 13. 
Last seen—Oct. 6 (1904)—Nov. 29 (1887); 
ave. 20) yrs.) Oct. 22. 
154. Junco hyemalis hyemalis Slate-colored Junco, 
