34 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
seen by Mr. Frazar near Montserrat Island on March 4, 1887. In view of all 
this and of the fact that P. aethereus is known to breed in some numbers on 
San Pedro Martir Island, “a rock about one and a half miles long, nearly 
as broad, and 1045 feet in height,”?! situated in the Gulf of California, a 
little north of latitude 28° and about midway between Lower California and 
the mainland of Mexico, we may assume that the bird occurs regularly and 
not infrequently in the waters immediately about the Cape Region proper, 
although this does not seem to have been as yet definitely established. Of the 
San Pedro Martir colony Colonel Goss has given us the following interesting 
account : — 
“ The birds breed in holes and crevices on the sides of the steep cliffs that often 
overhang the water; many were inaccessible. I was therefore able to reach and 
examine but few of their nesting places. These were without material of any kind 
for a nest; the egg (for they lay but one) was upon the bare rock. In nearly all, 
however, I found a young bird, about half grown; from this I think the birds 
begin to lay as early as the middle of February. With the aid of the Indians, who 
are expert climbers, I was only able to procure and save seven of their eggs. The 
ground color is dull grayish white, rather finely and evenly sprinkled with deep 
claret brown, generally thickest at large end, the specks running largely together, 
giving the eggs a clouded or marbled look. In form they are ovate. Measure- 
ments of the same, 2.31 X 1.71, 2.40 < 1.72, 2.40 * 1.78, 2.26 x 1.71, 249 x 1.81, 
2.40 X 1.69, 2.88 x 1.68. When approached the birds within their homes do not 
attempt to leave, but vigorously defend the same, striking and biting with their 
strong, pointed, sharp-edged, jagged bills, lacerating the ungloved hand that dares 
intrude, uttering at the same time a loud, harsh, rapid che-che-che-che-che-che-che, — 
notes of defiance, and often heard in their rival flights. The birds are very beau- 
tiful, and cannot fail to attract attention, especially when in the air, by the peculiar 
rapid stroke of their wings and graceful waving motion of their long whip-like 
tails.” ? 
The Red-billed Tropic Bird has been seen by Mr. Bryant as far north on the 
Pacific coast of the Peninsula as Cape Colnett (about latitude 31° 15’), and a 
skull is said to have been found near San Francisco many years ago.® 
Sula brewsteri Goss. 
BREWSTER’S Boosy. 
Sula leucogastra (not Pelecanus leucogaster BoppAERT) BEtpina, Proc. U. S. Nat. 
Mus., VI. 1883, 352 (near Pichalinque Bay). 
Sula sula (not Pelecanus sula Linnaeus) Bryant, Proc. Calif. Acad. Sci., 2d ser., 
If. 1889, 253 (near Pichalinque Bay). 
An immature Gannet taken near Pichalinque Bay in January, 1883, by Dr. 
H. Ten Kate, was recorded by Mr. Belding as an example of Sula leucogastra, 
1 Goss, Auk, V. 1888, 240. 2 Goss, Loe. cit., 244. 
® Bryant, Proc. Calif. Acad. Sci., 2d ser., II. 1889, 86, footnote. 
