FAMILY SULID.K. — GANNETS. 51 



FAMILY 5ULID/E. 



Gannets. 



Bill, stout, but not hooked; chin, bare; neck, thick; :^smmimmm 

 toes, four, all connected by webs. 



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



llc:i(l, sooty lirowii; lielly, whiLe; feet, yellowish or ii'n'enish, but never red (adult). 



Snla sulu. Booby Qannet. 

 See No. 7."). 

 Head, sooty lirowu; Welly, brownish; feet, not red (imniature). 



Sula sula. Booby Gannet. 

 See No. 7."). 

 Head, white tinned witii bull; iielly, white; feet, red (adult). 



Sula pisccUor. Red=footed Booby. 

 See No. 7C. 



* 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, tinged with butt"; primaries, dark; inmuiture birds are mottled, gray- 

 ish brown and white. *'«?'« baf<sana. Qannet. 



See No. 77. 



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



skin without feathers. 



(;.'iicral plumaiif, sooty browu (rarely whitish); underparts, white; feet, greenish 

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



See No. 7.5. 



(Jeneral plumag<', white; feet, red; gular sa,ck, blackish; bare skin in front of eye 

 and angle of jaw, pink red; tail, white; immature birds are grayish browu. 



Sula piscator. Red=footed Booby. 



See No. 70. 



General pliiuiagr, white; feet, leaden blue; gular sack, blackish; bare skin in front of 

 eye, bluisli; tail, sooty browu; the middle feathers tinged with hoary; young birds are 

 sooty gray. Sula cyanops. Blue^faced Booby. 



See No. 74. 



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



Sides of chin, feathered ; a narrow strip of bare skiu dowu ■' Idle of throat ; adults, white : 

 head tinged with buft"; immature birds, mottled grayish b.own a d hite. Sulabassana. Gannet. 



See No. 77. 



AVhole chin and upper throat, i»are; feet, leaden blue; wing, always less thau 18. Acci- 

 dental straggler, on Florida coast, not recorded elsewhere in Eastern North America. 



Sula cyanops. Blue^faced Booby Gannet. 

 See No. 74. 



* For directions for measurement, sec page !). 



