75 



Gents SULA Brisson. (Page 74, pi. XIX., figs. 1, 2.) 



J\'est a riicif ])l:urorin of sticks, etc., on rocks, trees, or bushes by sca-shoro. 

 Eggs 1-2. elliptical or elongate-ovate, chalk-white superficially, but beneath the 

 calcareous crust palo greenish blue. 



Species. 



a'. Whole lower jaw, together with chin and entire throat, naked. (Subgenus 

 Sula.) 

 i'. Young with upper jiarts variegated. 



Young (f) : Head, neck, and lower parts white ; upper parts dark 

 grayish brown, the leathers with white tips; bill purplish, the 

 up])er 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. Hah. 

 Coast of Peru. 



S. variegata (TscuuDi). Peruvian Booby.' 

 b'. Young with upper parts unicolorcd. 



c'. Xaked skin of face and throat blackish (dark bluish in life). 



Adult : White, the remiges, greater wing-coverts, primary coverts, 



and aluljB dark sooty brown ; middle tail-feathers hoarj- 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.i5, depth of bill 



at base 1.40-1.60. Eggs 2, 2.46 X 1.74. Bab. Intertropical 



seas, especially the South Pacific and in West Indies, breeding 



north to the Bahamas ; southern Florida. 



(8.) 114. S. cyanops Si nd. Blue-faced Booby. 



c'. Naked skin of face and throat light colored (yellowish or reddish in 



life). 



<f . Feet greenish or yellowish. Adult : Head, neck, breast, and ujijier 



parts dark sooty brown, the head and neck hoary grayish, in 



older (?) specimens, sometimes nearly white anteriorlj- ; lower 



parts, from breast backward, white. Young : Xearly uniform 



soot}' 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 X 1-58. Ilab. 



Tropical and subtropical coasts of America, north to Georgia 



(9.) and northwestern Mexico 115. S. sula (Linn.). Booby. 



> Ov'poru) variegalut TscBCDi, Weigm. Archiv. 18-13, 390. Sula varitgata ScL. &, Salv., Norn, \cotr, 

 1S73, 124. 



