204 LARIDiE. 



Gray, Hand-l. B. iii. p. 114, no. 10986 (1871) ; Scl. Sf Salv. P. Z. S. 



1871, p. 578; iid.Nom. Av.Neotrop.]). 148(1873); Saunders, P.Z.S. 



1877, p. 799 (Magellan Str.) ; id. op. cit. 1878, p. 203 (revision 



Larina;) ; id. Voy. '■Challeriger,' n. Birds, p. 138(1880); Sharpe, 



P. Z. S. 1881, p. 16 (Cape Gregory) ; Ridgw. Pr. U.S. Nat. Mus. 



xii. p. 139 (1890 : Port Otway) ; Oustalet, Miss. Sc. Cap Horn, 



vi. (1891) p. 181. 

 Larus ridibundus, P. P. Kinq, Zool. Journ. iv. p. 104 (1828-29) ; id. 



Voy. Adv. 8f Beagle, i. p. 541 (1839 : Magellan Strs.). 

 Xema cirrhocephalum, Gould, Zool. Beagle, iii. p. 142 (1841, nee 



Vieill.) ; Fraser, P. Z. S. 1843, p. 119 ('S. Chile). 

 Xema eirrbocephala, Gray (nee Vieill.), List B. Brit. Mus., Anseres, 



p. 173 (1844: partim). 

 Xema glaucodes, Bole, Isis, 1844, p. 192 ? 

 Larus albipennis, Gray, List B. Brit. Mus., Anseres, p. 173 (1844: 



ex Licht. MS.*); Peak, Zool. U.S. Eupl. Exped. p. 288 (1848: 



Chile) ; Cassin, Orn. U.S. Expl. Exped. p. 379 (1858 : Chile). 

 Chroicocephalus glaueotes, Bruch, J. f. O. 1858, p. 105 ; id. op. cit. 



1855, p. 291 ; Licht. Nnmencl. Av. p. 98 (1854 : Chile). 

 Gavia glaueotes, Bp. C. R. xlii. p. 771, no. 71 (1856). 

 Gavia roseiventris, Gould, P. Z. S. 1859, p. 97 (Falkland Islands). 

 Larus roseiventris, Sclater, P. Z. S. 1860, p. 391 ; Abbott, Lbis, 1861, 



p. 166 (Falkland Islands). 

 Larus glaueotes, Cabanis, Ibis, 1861, p. 312. 

 Larus glaucotis, Schl. Mus. P.-Bas, Lari, p. 42 (1863). 

 Gavia glaucotis, Blasius, J.f. O. 1865, p. 374. 

 Larus cirrhocephalus, Pek. {iiec Vieill.) Reis. Novara, Vog. p. 151 



(1865: Chile, breeds). 

 Larus cirrhocephalus (partim), Sharpe, P. Z. S. 1881, p. 16 (Talca- 



huano, Chile). 

 Chroeocephalus glaucodes, Heine 8f Reichenoto, Nomencl. Mus. Hein. 



p. 359 (1890). 



Advlt in hreeding-plumage. Very like the preceding species, from 

 which it differs in having less black and no bar whatever on any of the 

 primaries : these having little more than black borders on the inner 

 webs {see cut on p. 205) ; the underparts much more suffused with a 

 beautiful pink. It is also rather smaller. Total length 14 inches, 

 culmon 1"7, wing 11, tail 4"8, tarsus 1'75, middle toe with claw 1"65, 



Adult in winter. Similar. 



Nestling. Cinnamon-buff, mottled with brownish black on the 

 upper surface : bill, tarsi, and toes yellowish brown. 



FledgUng. Chiefly pale umber-brown above and paler below ; the 

 grey of the mantle and wings showing through the brown half- 

 down. 



Young (about two months old). Head and mantle chiefly cin- 

 namon-buff ; the tail white, with a narrow brown terminal band ; 

 secondaries grey with dark centres ; shafts of principal primaries 

 ivhite throughout ; outer quills with very extensive white centres 

 and practically little more than black borders and subterminal bars 

 {see cut on p. 205) ; the succeeding primaries similar, but gradually 

 acquiring a grey ground-colour, while the intensity of the black 



* Type in Berlin Museum esamiued. 



