54 PACIFIC COAST AVIFAUNA No. 12 
82. Circus hudsonius (Linnaeus) 
Marsu Hawk 
Circus hudsonius (1) van Rossem, Condor, x1, 1909, p. 208. (2) Burt, Condor, x11, 1911, 
p. 166. (3) Willett, Pac. Coast Avif., 7, 1912, p. 46. 
Evidently a straggler to the islands. A. van Rossem (7) shot a female on 
the Coronados, April 6, 1909; H. C. Burt (2) took an immature male on Anaca- 
pa, Mareh 15, 1911; and C. B. Linton (WS) tells me that he has seen the species 
on Santa Cruz. 
83. Accipiter velox (Wilson) 
SHARP-SHINNED Hawk 
Accipiter velox (1) Mailliard, Bull. Cooper Orn. Club, 1, 1899, p. 44. (2) Richardson, 
Condor, x, 1908, p. 66. (3) Linton, Condor, x1, 1909, p. 194. (4) Willett, Pac. Coast 
Avif., 7, 1912, p. 46. 
Probably not rare during the fall, winter and early spring. On San Cle- 
mente, C. B. Linton (3) saw several of these birds during December, 1908; C. H. 
Richardson (2) recorded one from Catalina, April 19, 1905; and J. Mailliard (7) 
lists it as having occurred on Santa Cruz in April, 1908. 
84. Accipiter cooperi (Bonaparte) 
CoorpER Hawk 
Accipiter cooperi (1) Mailliard, Bull. Cooper Orn. Club, 1, 1899, p. 44. (2) Howell and 
van Rossem, Condor, x11, 1911, p. 209. (3) Willett, Pac. Coast Avif., 7, 1912, p. 46. 
(4) Grinnell, Pac. Coast Avif., 11, 1915, p. 64. 
Recorded only from Santa Cruz Island, where I believe it to be resident im 
small numbers. J. Mailliard (7) lists the species from that locality during April, 
1908, and on April 25, 1911, I (2) saw a pair at the lower edge of the pines which 
acted very much as if they had a nest near by. 
85. Buteo borealis calurus Cassin 
WESTERN RED-TAIL 
Buteo borealis calurus (1) Grinnell, Auk, xv, 1898, p. 234. (2) Mailliard, Bull. Cooper 
Orn. Club, 1, 1899, p. 44. (3) Breninger, Auk, xx1, 1904, p. 220. (4) Richardson, 
Condor, x, 1908, p. 66. (5) Linton, Condor, x, 1908, p. 83. (6) Linton, Condor, x, 
1908, p. 127. (7) Grinnell, Pac. Coast Avif., 11, 1915, p. 65. 
Fairly common resident of the larger islands. C. B. Linton (5) says that 
several pairs were nesting on San Clemente in 1907, and L. M. Huey (MS) saw 
a bird there March 25, 1915. I have found it common in the early spring at Cat- 
alina, and on April 11, 1911, discovered in a tree a nest that held two pipped 
eggs. J. Grinnell (7) saw two or three every day when he was there in Decem- 
ber, 1897. C. B. Linton (6) noted several on Santa Cruz during November and 
December, 1907, and A. van Rossem and I saw one there May 1, 1911. 
