FAMILY SULID^E. GANNETS. 51 



FAMILY SULIO4S. 

 Gannets. 



Bill, stout, but not hooked; chin, bare; neck, thick; 

 toes, four, all connected by webs. 



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



Head, sooty brown; belly, white; feet, yellowish or greenish, but never red (adult). 



Sitl a sula. Booby Qannet. 



See No. 75. 

 Head, sooty brown; belly, brownish; feet, not red (immature). 



Sula sula. Booby Qannet. 



See No. 75. 

 Head, white, tinged with buff; belly, white; feet, red (adult). 



Sula piscat or. Red-footed Booby. 



See No. 76. 



* Group 2. Wing, 15 to 17 inches lo"ng. 



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

 skin down the middle of the throat. 



Adult, white head, tinged with buff"; primaries, dark ; immature birds are mottled, gray- 

 ish brown and white. Sula bassana. Qannet. 



See No. 77. 



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



skin without feathers-. 



General plumage, sooty brown (rarely whitish) ; underparts, white ; feet, greenish 

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



See No. 75. 



General plumage, white ; feet, red ; gular sack, blackish ; bare skin in front of eye 

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



Sula piscator. Red -footed Booby. 



See No. 76. 



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

 eye, bluish; tail, sooty brown; 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 skin down -'idle of throat ; adults, white ; 

 head tinged with buff; immature birds, mottled grayish brown a d hite. Sulabassana. Qannet. 



See No. 77. 



Whole chin and upper throat, bare ; feet, leaden blue ; wing, always less than 18. Acci- 

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



Sula cyanops. Blue-faced Booby Qannet. 

 See No. 74. 



* For directions for measurement, see page 9. 



