FAMILY SOLIDJi. GANNETS. 51 



FAMILY SULID/E. 



Qannets. 



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

 toes, four, all connected by webs. 



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



Head, sooty lirowu; belly, white; feet, yellowish or greenish, but uever red (adult). 



Sida sula. Booby Gannet. 

 See No. 75. 

 Head, sooty browu ; belly, browuish; feet, not red (immature). 



Sula sula. Booby Qannet. 

 See No. 75. 

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



Sidapiaeator. 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, tinged with buff'; primaries, dark ; immature birds are mottled, gray- 

 ish brown and white. '-^'"''« hassana. 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. '5'w«a *"'» Booby Gannet. 



•^ -^ 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. 70. 



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

 eye, bluish; tail, sooty brown; the middle feathers tinged with hoary; young birds are 

 sootv o-ray '^'"'" cyanojys. 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. Siilabassam. Gannet. 

 " See No. 77. 



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

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



Stila cyanops. Blue°faced Booby Gannet. 



See No. 74. 



* For directions for measurement, see page 9. 



