1917 BIRDS OF THE SOUTHERN CALIFORNIA ISLANDS 
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urements of males and females. The greatest difference was shown in the length 
of wing of the dark and the white males, which varied + millimeters. There were 
69 males and 65 females. Comparison showed that the greater wing coverts (the 
light pateh) of the white-rumped birds are of a more grayish tinge and a lighter 
shade than are those of the dark-rumped, and in the former the throat is more 
plumbeous than in specimens of the latter collected at the same time. In short, 
the differences seem pronounced enough to warrant recognizing a subspecies, if 
it was not for the vital fact that the two extreme types may repeatedly be found 
together in the burrows before the egg is deposited. This precludes the possibil- 
ity of a valid subspecies. 
38. Phalacrocorax auritus albociliatus Ridgway 
FARALLON COoRMORANT 
7 
Graculus dilophus (1) Cooper, Proc. Calif. Acad. Sci., 1v, 1870, p. 79. (2) Henshaw, Rep. 
Wheeler Surv., 1876, p. 275. 
Phalacrocoraz dilophus albociliatus (3) Baird, Brewer and Ridgway, Water Birds N. Am. 
11, 1884, p. 153. (4) Streator, Orn. & Ool. x11, 1888, p. 54. (5) Grinnell, Pasadena 
Acad. Sci., 1, 1897, p. 25. (6) Grinnell, Pasadena Acad. Sci., m, 1898, p. 9 (7) 
Mearns, Bull. U. S. Nat. Mus., tyr, 1907, p. 141. (8) Linton, Condor, x, 1908, p. 126. 
Phalacrocorax dilophus (9) Streator, Proc. Sta. Barbara Soc. Nat. Hist., 1, 1887, p. 23. 
Farallon Cormorant (1) Beck, Bull. Cooper Orn. Club, 1, 1899, p. 85. (77) Willett, Con- 
dor, x11, 1910, p. 170. 
Phalacrocorax auritus albociliatus (12) Grinnell, Pac. Coast Avif., 3, 1902, p. 16. (73) 
Grinnell and Daggett, Auk, xx, 1903, pp. 32, 37. (74) Linton, Condor, x, 1908, p. 82: 
(15) Wright, Condor, x1, 1909, p. 99. (16) Osburn, Condor, xr, 1909, p. 1386. (17) 
Willett, Pac. Coast Avif., 7, 1912, p. 20. (78) Wright and Snyder, Condor, xv, 1913, 
p. 90. (79) Grinnell, Pac. Coast Avif., 11, 1915, p. 29. 
Phalacrocoraxr a[uritus]. albociliatus (20) Willett, Condor, x11, 1910, p. 173. 
Common resident, breeding on most of the islands. This species is an abun- 
dant breeder on the Coronados, the principal colonies being loeated on north isl- 
and. In the spring of 1897, J. Grinnell (5) noted immature birds commonly at 
San Nicolas, but none were found breeding. At San Clemente C. B. Linton (14) 
recorded the species as fairly common during the winter months, a flock of some 
two hundred birds being seen February 5, 1907. 
T have found a few old nests, too early in the season for eggs, among those 
of the Brandt Cormorant, on Ship Rock, near Catalina. This is the only time 
that I have ever noted nests of the two species within a few feet of each other. 
Large numbers breed on Santa Barbara Island, where, towards the latter part 
of April, they begin coming in from the sea, to select and start repairing the old 
nests. J. Grinnell (5) notes, however, that on May 15, 1907, only two sets of 
eggs had as yet been laid. D. R. Dickey (VS) states that there were quite a 
number breeding on Anacapa in 1913, and H. Wright (78) found a few pairs 
with newly completed nests there as late as July 5, 1912. R. H. Beek (10) says 
that in 1895 there were birds breeding on a rock near Scorpion Harbor, Santa 
Cruz Island; and on Prince Islet, San Miguel, G. Willett (20) recorded quite a 
large colony with nearly full grown young and eggs in various stages, June 15, 
1910. 
