146 SULIDZ. 
Juv. Brunnea, plumis griseo vel fulvescenti-albo marginatis; gutture brunneo, corpore reliquo subtus albo. 
(Descr. exempl. juv. ex Ins. Kermadec. Mus. Brit.) 
Hab. Sourn Atianric, Soura Pactric, AND Inpran Oceans; West INDIES, and northward 
to Southern Florida 4.—Revitiaciervo Is., Socorro I. (Grayson? *, Anthony *), San 
Benedicte I.’, Clarion I.° (Anthony). 
Though somewhat similar to S. dassana in general appearance, the Blue-faced 
Gannet is distinguished by the form of the line of feathering skirting the throat. 
In S. bassana there is a band of bare skin down the centre of the throat, the feathered 
lines of which extend forward in a double point between the rami of the mandible as 
far as the notch of the maxilla, whereas in S. cyanops the line is truncate, with the 
margin not forked, and falling far short of the notch in the maxilla®. Thus the chin 
and entire throat are bare, and appear in the preserved skin as blackish, having been 
dark blue in life’. 
Mr. Anthony states that this species was not so common on Socorro Island as it was 
on San Benedicte’?; here he found it breeding, but on Clarion the birds were more 
abundant still, and the nests were found on the beach and up to the top of the island 9. 
The nesting-habits are similar to those of the other species of the genus, and but a 
single chalky-white egg is laid. 
8. Sula piscator. 
Pelecanus piscator, Linn. Syst. Nat. i. p. 217°. 
Sula piscator, Salv. Ibis, 1864, p. 378°; 1866, p. 200°; Ridgw. Pr. U.S. Nat. Mus. p. 578°; 
Man. N. Amer. Birds, p. 76°; A. O. U. Check-l. N. Amer. Birds, p. 40°; Richm. Pr. 
U.S. Nat. Mus. xvi. p. 5317; Ogilvie Grant, Cat. Birds Brit. Mus. XXVi. p. 482°. 
Alba, tectricibus alarum majoribus et remigibus nigricanti-brunneis, cinereo externe adumbratis, secundariis 
intimis albis; cauda alba; corpore reliquo subtus albo, subalaribus quoque albis, tectricibus subalaribus 
externis brunneis, plagam magnam formantibus: rostro cyanescente, basin versus rubescente; pedibus 
miniatis vel fere coccineis; gula nuda saturate schistacea vel nigra; regione nuda orbitali cyanea; iride 
grisea. Long. tota circa 26:0, ale 14-7, caude 8-2, culm. 3°35, tarsi 1:35. (Descr. femine adult ex 
Half-Moon Cay. Mus. nostr.) 
Juv. Fumoso-brunnea, subtus grisescens ; alis brunneis, tectricibus alarum majoribus remigibusque conspicue 
griseo adumbratis: rostro cyanescenti-rubro, basin versus magis coccineo; regione nuda orbitali plum- 
pescente; gula nuda cornea. (Descr. exempl. juv. ex Half-Moon Cay, Mus. nostr.) 
Hab. TROPICAL AND SuBrTRoPIcAL Ocxans north to Florida °—British Honpuras, Half- 
Moon Cay (0. 8.28); Honpuras (Dyson ®), Swan I. (Lownsend 4); NICARAGUA, 
Greytown (Richmond *). 
S. piscator belongs to the section of the genus Sula in which the feathering of the 
throat takes a truncate form on the margin of the bare portion of the latter. The 
adult bird is for the most part white, and the tail-feathers of the same colour, with 
hoary-grey margins in immature specimens. The young are sooty brown, a little paler 
on the underparts. 
