1917 BIRDS OF THE SOUTHERN CALIFORNIA ISLANDS 57 
and C. B. Linton (9) says it is quite common there. Willett (17) found Duck 
Tlawks to be common on San Miguel the middle of June, 1910. 
- Where there are colonies of small pelagic birds, these faleons are the com- 
monest. They usually nest on inaccessible cliffs, but on north island of the Cor- 
onados group, they breed on ledges in the eaves of the hillsides, and are easily 
accessible without a rope. A. van Rossem (MS) found a set of eggs there that 
were deposited on a bare ridge close to a path. Fresh eggs may be looked for 
during the last half of March and first of April. 
J. Grinnell and F. S. Daggett (16), on the Coronados, found skins of the 
Western Gull turned wrong side out over the head, leaving the skeletons picked 
clean, and believe that the hawks were responsible. H. Linton and G. Willett 
(9) saw one take a Red Phalarope from the kelp near the shore of Santa Cruz 
Island. First one and then another of a pair of faleons chased the little fellow 
until he was tired out. C. B. Linton (9) states that Black Turnstones are a fa- 
vorite prey. As previously stated, they do great damage among the colonies of 
petrels, auklets and murrelets during the nesting season, while in winter, not 
even that expert diver the Rhinoceros Auklet is immune from their successful at- 
tacks. I have found that when the young Duck Hawks are thoroughly strong on 
the wing, the majority forsake the islands, and probably spend the rest of the 
season along the mainland coast. On the Coronados, June 8, 1913, A. van Ros- 
sem shot an immature bird which tumbled down a cliff. As we were approaching 
it in a skiff two hours later, an adult arose from the carcass, and upon examina- 
tion we found that the whole back and one wing had been eaten away, so the 
species evidently has cannibalistic tendencies. 
90. Falco columbarius columbarius Linnaeus 
Pigeon Hawk 
Falco columbarius (1) Linton, Condor, x, 1908, p. 127. 
Rather rare winter visitant. While D. R. Dickey was removing a fox from 
a trap on San Clemente Island, March 30, 1915, a pair of these birds circled 
closely around him for two or three minutes. He says that there could have been 
no mistake in identification, and from then until we left, April 11, we several 
times saw what were evidently the same birds. C. B. Linton (7) noted a few in 
the canyons of Santa Cruz Island during November and December, 1907. 
91). Falco sparverius phalaena (Lesson) 
DerserRT SPARROW Hawk 
Falco sparverius deserticolus (1) Mailliard, Bull. Cooper Orn. Club, 1, 1899, p. 44. 
Falco sparverius (2) Linton, Condor, x, 1908, p. 83. (3) Wright and Snyder, Condor, 
2, UNDE so Me 
Falco sparverius phaloena (4) Linton, Condor, x, 1908, p. 127. (5) Osburn, Condor, 
x1, 1909, p. 137. (6) Burt, Condor, x111, 1911, p. 166. 
Sparrow Hawk (7) Willett, Condor, x11, 1910, p. 172. 
Reported from several islands, and probably resident. C. B. Linton (WS) 
says that he has seen these birds on San Nicolas Island; he (2) recorded them as 
occasional on San Clemente, in 1907. H. C. Burt (6) reported a pair on Ana- 
