| No. | Sex | Wing | Tail | Tarsus | Culmen |
| 57,552 | ♂ | 262 | 96 | 104 | 127 |
| 86,480 | ♂ | 258 | 98 | 100 | 131 |
| 86,481 | ♀ | 250 | 98 | 84 | 105 |
Sula dactylatra personata Gould.
Five adults, both sexes, Tubbataba Reef, Sulu Sea, August, 1913.
The Blue-faced Booby, which breeds in the Tubbataba Reef in the Sulu Sea is indistinguishable, so far as I can see, from the Australian form.
The color of the bill and feet was not noted on the labels of Gov. Forbes's birds; in the dry specimens the bill is pale yellow and the feet are dull greenish black.
Measurements.
| No. | Sex | Wing | Tail | Tarsus | Culmen at Base | Width of Culmen |
| 64,611 | ♂ ad. | 418 | 190 | 59 | 101 | 30 |
| 64,614 | ♂ ad. | 398 | 190 | 59 | 99 | 30 |
| 64,616 | ♂ ad. | 405 | 184 | 57 | 100 | 28 |
| 64,612 | ♀ ad. | 420 | 183 | 61 | 102 | 29 |
| 64,613 | ♀ ad. | 424 | 185 | 59 | 103 | 28 |
Fregata minor minor (Gmelin).
Six specimens, two adult males in full breeding plumage, three adult females and one immature male, from Cavilli and Bancoran Islands, Sulu Sea, March and September.
I follow Rothschild in restricting Gmelin's name minor to the bird of the eastern Indian Ocean, north Australia etc. (= F. minor listeri Mathews), and with little doubt refer to this form the Philippine Frigate.