224 lAEID^. 



Larus fuliginosus (part.), Gray, List D. Brit. Mus., Anseres, p. 170 



(1844 : as regards Chile). 

 Larus bridges!, Fraser, P. Z. S. 1845, p. 16 ; id. Zool. Typ. pi. 69 



(1849 : Chile) ; Reichenh. Natat. Novit. xviii. tab. 281. fig. 2317 



(1852) ; Cassin, U.S. Astronoin. E.rped. ii. p. 205 (1855 : Chile). 

 Blasipus bridgesi, Bruch, J. f. O. 185.3, p. 108 ; id. op. cit. 1855, 



p. 280 ; B2). Rev. Zool. 1855, p. 21 ; id. C. R. xlii. p. 770 (1856) ; 



id. Consp. Av. ii. p. 212 (1857) ; Blasius, J. f. O. 1865, p. 378 



(revision). 

 Chroieocephalus modestus, Licht. Nomencl. Av. p. 98 (1854). 

 Larus polios, Natt. MS. fide Bp. Rev. Zool. 1855, p. 21 ; id. Consp. 



Av. ii. p. 212 (1857). 

 Epitelolarus modestus, Heine 8^ Reichenoiv, Nomencl. Mus. Hein. 



p. 359 (1890). 



Adult in breeding-plumage. Forehead and chin white, gradually 

 shading into pale grey on the crown and throat, and darker grey on the 

 neck and underparts ; mantle, wing-coverts, and long inner second- 

 aries lead-colour ; principal secondaries with black centres and wide 

 white edges to their outer webs, forming a conspicuous alar band ; 

 quills chiefly sooty black, the four upper ones tipped with greyish 

 white ; tail-feathers plumbeous, with a subterminal black band, 

 which varies in completeness and definition with the age of the 

 feathers — being broad and crossing both webs when the feather is 

 new, while sometimes reduced to a spot on each web when the 

 feather is old ; the tips of the rectrices grey, whiter on the outer- 

 most ; under wing-coverts dark brownish grey : " iris black " 

 {Rowland) ; bill, tar.si, and toes black with a reddish tinge. Total 

 length 18 inches, culmen 2 to 2-1, wing 13, tail 5"5 ; tarsus 1-9, 

 rather slender ; middle toe with claw 1*75, delicate, claw curved. 



The male is probably a trifle larger, with a more robust bill than 

 the female, but the specimens in which the sex has been ascertained 

 by dissection are few in number. Cassin (U.S. Astronom. Ex])ed.) 

 thought that it was the male which had the wide black band on 

 the tail, while this was imperfect in the female, but his view requires 

 confirmation. 



Immature. Similar, but with a duller tinge ; the head dirty white 

 to brownish on the nape and throat, where the colour deepens and 

 forms a faint collar : bill, tarsi, and toes dark reddish brown. 



Young. Much browner on the upper and under surfaces ; the 

 primaries and secondaries dark umber-brown, with narrow tawny 

 edges to the latter ; tail-coverts dull grey ; rectrices dark brown 

 with paler tips. 



Hah. Coasts of Peru and Chile : inland as far as Santiago. 



a, b. Juv. et Chile (Bridges). Purchased, 



vix ad. St. 



c. Vix ad. sk. Valparaiso {Bridf/es). Purchased. 



(Type of L. bridyesi, Fraser.) 



d. Vix ad. sk. Near Valparaiso. H. Berkeley James, Esq. 



[P.]. 



e. V ad.;/. Iquique, Prov. Tarapaca (.S. i^. H. Saunders Coll. 

 Juv. sk. Rowland). 



{/. 1mm. sk. Callao Bay, Peru [R. .Tump). H. Saunders Coll. 



