66 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4TH SER. 
Fregetta grallaria (Vieillot): WHITE-BELLIED PETREL 
Fregetta albigularis (Finsch): WHITE-THROATED PETREL 
Cours—Fregetta tropica, 1. 85, 91, in part. 
Satvin—Cymodroma albigularis, 364, 367. 
GopMAN—Cymodroma albigularis, xxxviii, 68, pl. 19. 
Fregetta meestissima Salvin: SAMOAN PETREL 
Satvin—-Cymodroma mestissima, 364, 367. 
GopMAN—Cymodroma mestissima, xxxviii, 71, pl. 20. 
PELECANOIDID£: Divine PETRELS 
Key to the Species 
Nasal tubes, jointly, shaped somewhat like a twin ellipse, and not very 
PLOMMMEN ET es cise seen eis eis eln terete Cteeeeeie oe .Pelecanoides urinatrix 
Nasal tubes, jointly, heart-shaped and very prominent.......... P. garnoti 
Pelecanoides urinatrix (Gmelin): Divinc PETREL 
Cours—Pelecanoides uriairix, V, 190; Pelecancides Berardu, V, 190. 
SaLvin—Pelecancides urinatrix, 437; Pelecanoides exsul, 437, 438. 
Gopman—Pelecanoides urinatrix, li, 299, pl. 86; Pelecanoides exsul, 
lii, 304, pl. 87. 
The gray barring on the throat and jugulum of three Kerg- 
uelen Island specimens bears a strong resemblance to that 
in the gray-throated phase of Puffinus opisthomelas. A fourth 
Kerguelen specimen (68929 U. S. Nat. Mus.) has the gray 
chiefly restricted to the jugulum, in this respect nearly ap- 
proaching the grayest specimen from New Zealand seas (No. 
24361 Carnegie Mus.; Auckland Is.). Dr. Einar Lonn- 
berg has suggested that the explanation of the white and 
gray phases (recognized in nomenclature as P. urinatrix and 
“P. exsul’) is perhaps to be found in dichromatism.* The 
variation is certainly not sexual, and is apparently not due 
to age, for an Auckland Island specimen (No. 24362 Car- 
negie Mus.) going out of the natal down has the definitive 
feathers of the fore-neck immaculate white, while a New 
Zealand specimen (No. 24365 Carnegie Mus.), likewise 
going out of the natal down, has gray on the definitive feath- 
1 Contr. Fauna South Georgia, p. 74: 
