Vol. xk::v.] 44 



differs from S. d. dudylatra in having a much larger and 

 stouter bill. 



5. SULA DACTYLATRA GRANTI Rothsch. 



Bill red ; feet bluish green. 

 Range. Galapagos Islands. 



Type in the Tring Museum. Culpepper Islaud, Galapagos 

 Group. 



There is absolutely no other difference between the adult 

 of Sula dactylatra granti and S. dactylatra californica, except 

 that in S. d. granti the bill is red and the feet and legs 

 bluish-green, while in /S. d. californica the bill is yellow and 

 the feet and legs orange. 



The young birds of the first and second year are much 

 alike in plumage in the four races of /S'. dactylatra in which 

 they are known, but the young of /S. d. dactylatra is not 

 represented in collections. 



The first plumage of /S. d. melanops diflFers from that of 

 the other subspecies in having the head, neck, and Avings 

 blackish-brown ; in S. d. personata and S. d. californica 

 the head, neck, and wings are paler umber-brown; and the 

 young of S. d. granti is distinguished by the dull purplish- 

 pink bill. 



The true Sula variegata has never occurred on the 

 Galapagos Islands, its breeding-grounds being exclusively 

 the islands off the Peruvian coast. 



The adult S. variegata has the head, neck, front half of 

 the interscapulars, and under-surface pure white, the back, 

 rump, and wings being grey-brown, the feathers edged with 

 white. 



The young bird has the head and neck yellowish-grey, the 

 under-surface mottled-grey and whitish, and the rest of the 

 plumage grey-brown, not so uniformly edged with white. 

 The wing of S. variegata is also three inches shorter than 

 that of the Galapagos '' Masked Gannet.'^ 



The young of the Blue-footed Booby, Sula nebouxi, has 

 occasionally been mixed up with that of S. variegata and 



J 



