68 The Ornithology of Chester County 
ener). 
123. Corvus brachyrhynchos Crow. Common 
resident, abundant in winter. A famous roost lo- 
cated on the North Valley hills near Diamond rock, 
was visited as early as 1889 by the writer, and in 
1899, 1900 and 1901 by Dr. W. E. Rotzell. It 
occupied probably ten acres and shifted from place 
to place as the birds were disturbed. Flight lines 
have shown that the Crows sought this roost from 
Audubon on the Perkicmen, Port Kennedy, Norris- 
town, Conshohocken, Bryn Mawr, Radnor, Devon, 
Wawa, Westtown and League Island. 
Prior to 1890, another roost was situated on the 
North Valley hills near Coatesville. T. H. Windle 
estimated the number at trom 30,000 to 50,000. In 
1895, this roost was on the south ridge, between 
Coatesville and Pomeroy; later shifted back to the 
north ridge, which was occupied for several winters, 
according to H. E. Stone. Crows returned to this 
roost from Kennett Square, Timicular, Mortonville 
and probably from Lenape; while a number of other 
flight-lines converged from the north and west (Cog- 
gins, Cass., vil, 34, 36-38 and map). Nidification 
commences as early as Mar. 20 in open seasons, and 
the average date for a complete set is Apr. 15. 
124. Corvus ossifragus Fish Crow, “crow.” ‘Tol- 
erably common resident, formerly quite rare or ab- 
sent except in the southern part of the county. 
Some years prior to 1888, J. H. Matlack took a set 
of eggs somewhere along the Brandywine (Warren, 
Bds. Pa., 162). On Mar. 6, 1891, Frank H. Stauf- 
fer, of Berwyn, found a dead male in his yard and 
