FAMILY SULID. — GANNETS. 51 
FAMILY SULIDA.. 
Gannets. 
Bill, stout, but not hooked; chin, bare; neck, thick ; 
toes, four, all connected by webs. 
*QGroup |. Wing, 13 to 15 inches long. 
Head, sooty brown; belly, white; feet, yellowish or greenish, but never red (adult). 
Sula sula. Booby Gannet. 
See No. 75. 
Head, sooty brown; belly, brownish; feet, not red (immature). 
Sula sula. Booby Gannet. 
: See No. 75. 
Head, white, tinged with buff; belly, white; feet, red (adult). 
Sula piscator. Red-footed Booby. 
See No. 76. 
“am 
* Group 2. Wing, 15 to 17 inches long. 
Section |. 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. Gannet. 
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 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. 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 ~iddle of throat; adults, white ; 
head tinged with buff; immature birds, mottled grayish browna d_ hite. Sula bassana. 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. 
Sula cyanops. Blue-faced Booby Gannet, 
See No. 74. 
* For directions for measurement, see page 9. 
