150 LAT?IDJ2. 



P. Z. S. 1880, p. 163 (Trinidad Islet) ; id. Voi/. ' Challenger,' ii. 

 Birds, p. 136 (1881) ; Tristram, Ibis, 1881, p. 251 (Marquesas) ; 

 id. op. cit. 1883, p. 48 (Fanninj^ I., breeds) ; Salvin, Cat. Strickl. 

 Coll. p. 626 (1882); Crowfoot, Ibis, 1885, p. 2G6 (Norfolk I., 

 breeds) ; H. 0. Forbes, Nat. Wander. East. Archip. pp. 33-34 

 (Cocos or Keelin? Is.); Saunders, P. Z. S. 1886, p. 337(Diej;o Garcia, 

 Chagos Is.) ; MacFarlane, Ibis, 1887, p. 210 (Sala y Gomez I., 

 26° S., breeding-), p. 211 (Ducie I.), p. 212 (Pitcairn I.), p. 213 

 (Fanning I.) ; Ramsay, Tab. List Austr. B. pp. 23 & 38 (1888) ; 

 Pidlei/, Zool. 1888, p. 44; Sharpe, Journ. Linn. Sac. xx. p. 480 

 n890: Fernando Noronha) ; Tristram, Cat. Coll. B. p. 10 (1889); 

 North, Nests ^ Eggs Austr. B. p. 374, pi. xxi. fig. 4 (1889: Nor- 

 folk I.) ; Lister, P. Z. S. 1891, pp. 297-98, 300 (Phcsnix Group). 



Sterna pacifica, Lesson, N. H. Mamm. et Ois. x. p. 156 (1837 : Low 

 Archipelago). 



Sterna nivea, F. D. Bennett, Narr. Whaling Vog. i. p. 370, Caroline Id. 

 i. p. 384, Christmas I.: breeding (1840). 



Gygis alba, Licht. Nomencl. Av. p. 97 (1854: Sandwich Is.) ; Bp. 

 C. R. xlii. p. 772 (1856) ; Cassin, U.S. Erpl. Evped. p. 389 (1858) ; 

 Blasius, J. f. O. 1866. p. 73 (revision) ; Finsch Sc Hartl. Faun. 

 Centralpolgn. p. 232 a867) ; Bole, Pr. Bost. Soc. N. H. 1869, p. 306 

 (Sandwich Is.) ; Gray, Hand-l. B. iii. p. 122, no. 11083 (1871 ) ; 

 Sivinh. P. Z. S. 1871, p. 422 ; Finsch, op: cit. 1872, p. 114 ; Griiffe, 

 Journ. Mus. Godeffr. 1873, Bd. i. p. 50 (Huaheine) ; Salmd. tjcc. 

 Born. p. 375 (1874) ; Layard, P. Z. S. 1876. p. 497 (Levuka) ; 

 id. Ibis, 1876, p. 393; Hartl. Vog. Madag. p. 389 (1877); Finsch, 

 Journ. Mus. Godeffr. 1875, Hft. \iii. p. 43 (Pelew Is.) ; id. op. cit. 



1876, Hft. xii. p. 40 (Fiji, Samoa, & Carolines) : id. P. Z. S. 



1877, p. 782 (Ponape), p. 777 (Eua, Friendly Is.), p. 786 (Niua- 

 fou, breeds) ; id. P. Z. S. 1880, p. 577 (Caroline Is.) ; id. J.f. O. 

 1880, pp. 295 & 309 (Kushai) ; id. Ibis, 1881, pp. 105 & 109 

 (Kushai) ; id. t. c. pp. 113, 115 (Ponape) ; Streets, Bull. U.S. Nat. 

 Mus. vii. p, 28 (1877 : Fanning group) ; Schmeltz, Ethn. Abth. M. 

 G. 1881, pp. 224, 239, 299, 330, 353; Oates, D. Brit. Burm. ii. 

 p. 433 (1883) ; Vorderm. Nat. Tijdschr. Nederl. Ind. xliv. p. 207 

 (1884: Java); Finsch, MT. or'n. Ver. Wien, 1884, p. 125; id. 

 Vdg. Siidsee, p. 52 (1884: Kushai) ; Finsch, Ornis, 1887, p. 375 

 (Dieo'o Garcia) ; E. Netaton, Tr. Norio. Soc. iv. p. 553 (1888 : 

 (Mascarene Is.) ; Torderm. Nat. Tijdschr. Nederl. hid. xlix. 

 p. 420 (1889 : Sumatra) ; Heine Sc Reichenotv, Nomencl. Mus. 

 Hein. p. 356 (1890: "New Zealand"); Hartert, Katal. Vogel- 

 samm. Senckenb. p. 237 (1891 : Australia) ; Wiglesworth, Abh. zool. 

 Mvs. Dresden, 1890-91, no. vi. p. 78 (1892 : Polynesia) ; Roth.sck. 

 Arif. Lagsan. i. p. 35, cum tab., egg, pi. iii. fig. 11 (1893). 



Gygis napoleonis, Bp. C. R. xlii. p. 772 (1856). 

 Gygis alba kittlitzi, Hartert, Katal. Vogelsamni. Seticketib. p. 237 

 (1891 : Caroline Is.). 



Adult in breeding-plumage. Above and below ivory-white, except 

 for a narrow black ring round the eye ; at times, some dark 

 colour on the shafts of the primaries and rectrices, depending, I 

 think, on the age of the feather : bill black, irides blue ; tarsi and 

 toes dark brown, the webs yellow and very much incised. Total 

 length 12 to 13 inches (depending upon the length of the tail- 

 feathers), culmen I'S, depth of the bill behind the nostril 0-4, 

 wing 9'5, tail 425 to 5, tar.sus 0-6, middle toe with claw I'l. 

 Examples with fully developed and unabraded tail-feathers are 



