SULA. "5 
Genus SULA Brisson. (Page 74, pl. XIX., figs. 1, 2.) 
Nest a rude platform of sticks, ete., on rocks, trees, or bushes by sea-shore. 
Eggs 1-2, elliptical or elongate-ovate, chalk-white superficially, but beneath the 
calcareous crust pale greenish blue. 
Species. 
a, Whole lower jaw, together with chin and entire throat, naked. (Subgenus 
Sula.) 
b. Young with upper parts variegated. 
Young (?): Head, neck, and lower parts white; upper parts dark 
grayish brown, the feathers with white tips; Dill purplish, the 
upper mandible grayish horn-color; feet dusky (in dried skins) ; 
wing 14.60, tail 7.75, culmen 3.60, depth of bill at base 1.20. Had. 
Coast of Peru. 
S. variegata (TscuupI). Peruvian Booby.! 
6. Young with upper parts unicolored. 
c’. Naked skin of face and throat blackish (dark bluish in life). 
Adult : White, the remiges, greater wing-coverts, primary coverts, 
and alule dark sooty brown; middle tail-feathers hoary whitish, 
dusky at tips ; rest of tail-feathers dark sooty brown, whitish 
basally ; feet dull yellowish (drying pale brown or yellowish). 
Young : Head, neck, and upper parts plain dark grayish brown, 
part of the back and rump streaked with white; lower parts 
white, the flanks streaked with grayish; length 25.50-29.00, 
wing 16.15-17.80, tail 7.75-9.10, culmen 3.95-4.15, depth of bill 
at base 1.40-1.60. Hggs 2, 2.46 1.74. Hab. Intertropical 
seas, especially the South Pacific and in West Indies, breeding 
north to the Bahamas; southern Florida. 
(8.) 114. S. cyanops Sunp. Blue-faced Booby. 
ce. Naked skin of face and throat light colored (yellowish or reddish in 
life). 
ad, i greenish or yellowish. Adult: Head, neck, breast, and upper 
parts dark sooty brown, the head and neck hoary grayish, in 
older (?) specimens, sometimes nearly white anteriorly ; lower 
parts, from breast backward, white. Young: Nearly uniform 
sooty brown, paler beneath. Length 30.00-31.00, wing 14.15- 
16.60 (15.72), tail 6.50-9.70 (8.23), culmen 3.25-3.95 (3.74), 
depth of bill at base .95-1.40 (1.24). Eggs 2,2.24 158. Hab. 
Tropical and subtropical coasts of America, north to Georgia 
(9.) and northwestern Mexico.......... 115. S. sula (Liny.). Booby. 
1 Dysporus variegatus Tscuupi, Weigm, Archiv. 1843, 390. Sula variegata Sci. & Satv., Nom. Neotr. 
1873, 124, 
