Annotated List 53 



species is being replaced by the less conspicuous B. 

 platypterus. 



79. Buteo lineatus lineatus Red-shouldered Hawk, 

 "chicken hawk," "hen hawk," "mouse hawk." Com- 

 mon transient and less common winter resident. 

 Our most abundant Hawk during fall migrations. 

 There appears no authentic breeding records, though, 

 as Dr. Stone points out, we are well within its breed- 

 ing range. My Berwyn dates on autumnal arrival 

 and vernal departure follow: 



Sept. 23 (1902) Nov. 6 (1894); ave. 8 yrs. 

 Oct. 1 6. 



Feb. ii (1891) Apr. 5 (1917); ave. 9 yrs. 

 Mar. 14. 



80. Buteo platypterus platypterus Broad-winged 

 Hawk, "chicken hawk," "broad-wing." Common 

 summer resident. Michener, Warren, Pennock and 

 Montgomery, all consider it resident, bu.t there ap- 

 pear to be no winter dates and it has yet to appear 

 in the local Christmas census. This species, former- 

 ly quite rare, is now gradually supplanting B.bore- 

 alis, but owing to its inconspicuous presence, my 

 Berwyn migration records of its departure are few: 



Arrival Mar. 20 (1896) May 6 (1904) ; ave. 

 14 yrs. Apr. 21. 



Departure Sept. 6 (1903) Oct. 10 (1908); 

 ave. 3 yrs. Sept. 21. 



Nest with eggs was found by Phillips at Avon- 

 dale, Apr. 26, 1869 (F. and S., vi, 84), and with 

 increasing frequency by Matlack, Price, Warren, 

 Everett, Darlington, Jackson, Baugh, Ladd, Sharp- 

 ies, Pennock and Burns, principally on the Chester 



