NATATORES. 



365 



north as the coast of Georgia. Specimens from various localities are 

 in the collection of the Expedition. 



The Prince Bonaparte, in his Monograph of the Pelecanidae, in 

 Conspectus Avium, Vol. II, p. 164, regards this species as generically 

 distinct from that immediately succeeding, and adopts for it the name 

 Dysporus, lUiger. He regards also the name Pelecanm parvus, Gme- 

 lin, as applicable to the American Bird, the only difference between 

 which and that of other countries, is stated to be the smaller size of 

 the former. We have not succeeded in detecting any reliable distinc- 

 tive characters in the specimens in our possession. 



2. SuLA CAPENSIS, Lkhtenstein. 



" Sula capensis, LicllT." Bonap. Consp. Av. II, p. 165 (1855). 

 " Sula melanura, Temm." Bonap. ut supra. 



Reich. Vollst. Naturg. Birds, Plate LIV, figs. 2292, 2293. 



Dr. Pickering notices the occurrence of this species at the Cape of 

 Good Hope. We do not find it in the collection of the Expedition, 

 but specimens in various stages of plumage are in the Museum of the 

 Philadelphia Academy, from Southern and Western Africa, all of 

 which constantly present the specific characters relied on by natural- 

 ists as distinguishing it from Sula hassana. 



The most obvious character is the color of the tail, which is black 

 in the present species, and white in that just mentioned. In size and 

 general appearance the two species much resemble each other. 



3. Sola piscator {Linn.). — The Fishing Gannet. The 

 Red-legged Gannet. 



Pelecanus piscator, LiNN. Sjst. Nat. I, p. 217 (1766). 



Sula Candida, Briss. Orn. VI, p. 501 ; Steph! Gen. Zool. XEII, p. 103 (1826). 



Sida erythrorhyncha , Less. Traite, I, p. 601 (1831). 



Sula ruhripes, Gould, Proc. Zool. Soc. London, 1837, p. 156. 



Sula rulripeda, Peale, Zool. U. S. Exp. Exp. Birds, p. 274 (1st ed. 1848).* 



* " Plumage of both sexes pure white, excepting the primaries, secondaries, and first 

 row of greater wing-coverts, which are dark brown, with a hoary surface j tail cuneiform, 



92 



