62 PACIFIC COAST AVIFAUNA No. 12 
104. Chaetura vauxi (J. K. Townsend) 
Vaux SwIirt 
Chaetura vauxi (1) Mailliard, Bull. Cooper Orn. Club, 1, 1899, p. 44. (2) Willett, Pac. 
Coast Avif., 7, 1912, p. 59. 
Noted by J. Mailliard (7) on Santa Cruz Island during April, 1898. 
105. Aeronautes melanoleucus (Baird) 
WHITE-THROATED SWIFT 
Aeronautes melanoleucus (1) Grinnell, Pasadena Acad. Sci., 1, 1897, pp. 9, 15. (2) Mail- 
liard, Bull. Cooper Orn. Club, 1, 1899, p. 48. (3) Breninger, Auk, xx1, 1904, p. 220. 
(4) Mearns, Bull. U. S. Nat. Mus., tyr, 1907, p. 142. (5) Richardson, Condor, x, 1908, 
p. 66. (6) Linton, Condor, x, 1908, p. 84. (7) Linton, Condor, x, 1908, p. 127. (8) 
Osburn, Condor, x1, 1909, p. 187. (9) Ridgway, Birds North & Mid, Am., vy, 1911, p. 
688. (10) Willett, Pac. Coast Avif., 7, 1912, p. 59. (71) Grinnell, Pac. Coast Avif., 
11, 1915, p. 86. 
Aeronantes melanoleucus (12) Wright, Condor, x1, 1909, p. 100. 
White-throated Swift (73) Willett, Condor, x1, 1910, p. 171. 
Fairly common on most of the islands, and evidently breeding in suitable 
localities. A. van Rossem and I noted a small flock on the Coronados, June 25, 
1913, and the former shot a female which contained a well developed egg. They 
were probably nesting on the high sand-stone cliffs on the south side of south 
island. J. Grinnell (1) records this species from San Nicolas in May, 1897; on 
San Clemente, D. R. Dickey, L. M. Huey and I saw them several times in the 
early spring of 1915. Here at Howland’s Bay, C. B. Linton (6) saw them enter- 
ing crevices in the cliffs, March 7, 1907. I have repeatedly observed them dart- 
ing about the high ridges of Catalina in the spring, and G. Willett (13) found a 
number of them present on Anacapa, June 5, 1910. A. van Rossem and I saw 
small flocks on Santa Cruz the latter part of April, 1911, and C. B. Linton (7) 
recorded several there in December, 1907. 
106. Calypte costae (Bourcier) 
Costa HUMMINGBIRD 
Calypte costae (1) Grinnell, Pasadena Acad. Sci., 1, 1897, p. 15. (2) Mearns, Bull. U. S. 
Nat. Mus., Lv1, 1907, p. 142. (3) Willett, Pac. Coast Avif., 7, 1912, p. 60. (4) Grin- 
nell, Pac. Coast Avif., 11, 1915, p. 86. 
Breeds on some of the islands. During several visits to the Coronados in 
spring, I have found this hummer frequenting the low bushes that straggle over 
the chff bordering the cove on south island. It seems to be a fairly common 
breeder and is very much in evidence near its home site, making pugnacious sal- 
lies after other birds and even attacking any gull that chances near. J. Grinnell 
(1) records a single adult male on San Clemente, Mareh 30, 1897, but considers 
that it was merely a migrant. G. Willett (3) found it rather common among the 
cactus patches of Santa Barbara Island in June, 1911, and on the 19th, noted a 
female feeding young just out of the nest. 
