FAMILY SULID.E. GANNETS. . 51 



FAMILY 5ULID/E. 



Gannets. 



Bill, stout, but not hooked; chin, bare; neck, thick; J^^^sB^ramnin 

 toes, four, all connected by webs. f=^^^^ s 



* Group 1. Wing, 13 to 15 inches long. 



Head, sooty brown; l)<'lly, wiiite; feet, yellowish or j^reeuish, but uever red (adult). 



Sulci sula. Booby Gannet. 

 See Xo. 75. 

 Head, sooty browu; Ixilly, l)ro\vnish; feet, not red (immature). 



Sula sula. Booby Gannet. 

 See No. 7.5. 

 Head, white, tinged witli bull; belly, white; feet, red (adult). 



Sula piscator. Red=footed Booby. 

 See No. 76. 



* Group 2. Wing, 15 to 17 inches long. 



Section 1. Side of chin, feathered; a narrow strip of bare 

 skin down the middle of the throat. 



Adult, white head, tiui;ed with bull"; primaries, dark; immature birds are mottled, gray- 

 ish l)rown and white. Sula bassana. Gannet. 



See No. 77. 



Section 2. Whole of chin and upper part of throat, bare 



skin without feathers-. 



rjtMH'ral plumage, sooty biowu (rarely whitish); uuderparts, white; feet, greenish 

 yellow, or pale yellow. Sula sula. Booby Gannet. 



See Xo. "."). 



General plnmagf. white; feet, red; gular sack, Idackish; bare skin in front of eye 

 and angle of jaw, pink red; tnil. whit(!; inuuatnrt; birds are grayish brown. 



Sula piscaUn-. Red-footed Booby. 

 See Xo. 7(5. 



General pliuiiagr, while; feet, leaden blue; gular sack, blackish; l)are skiu in front of 

 eye, bluish; tail, sooty brown: the middle feathers tinged with lioary ; young I)ird-i are 

 sooty gray. Sula o/anops. Blue-faced Booby. 



See Xo. 7-1. 



* Group 3. Wing, 17 to 21 inches long. 



Sides ol chin, feathered; .i iiannw strip ot l>are skin liown 'Idle ol thioal ; adults, white ; 

 head tinged with l(utV: inmiatnre liirds, mottled grayisli l»,-owna d hile. Suhihassana. Gannet. 



See Xo. 77. 



Whole t-iiin ancl ii|)pei- throat, liare; feet, leade.i blue; wing, always less tlian IS. Acci- 

 dental siiaggler, on Florida coast, not recorded elsewhere in Eastern N'orth Ann-rica. 



Sula rmuops. Blue-faced Booby Gannet. 

 See No. 74. 



* For directloiirt for lucaeurfiiiciit, ftt'i- piige 9. 



