AVES LARID^. 



213 



Fig. 126. 



Nestlings are "cinnamon buff, mottled with brownish black on the 

 upper surface; bill, tarsi and toes yellowish brown." (Saunders.) 



Fledglings are "chiefly pale umber-brown above, and paler below; the 

 grey of the mantle and wings showing 

 through the brown half-down." (Saun- 

 ders.) 



Young, first flight, have the head and 

 mantle chiefly cinnamon-buff and the 

 tail white with a terminal band (half an 

 inch wide) of dusky brown. The shafts 

 of most of the primaries are white. 

 The three outer ones in pattern as 

 shown in the figure (No. 128, p. 214). The rest have an increasing amount 

 of the dark ground color on their webs, the inner ones being wholly grey. 



The secondaries are grey with dusky brownish centers. The under 

 wing coverts are pale, pearly grey. 



Immature birds of the year. (9, No. 7909 P. U. O. C. near Coy Inlet, 

 Patagonia, November 6, 1896). With white head, dusky on the occiput 

 and about the auriculars, assuming the grey immaculate mantle. The 

 primaries as in Fig. 126. The secondaries pale grey with large areas of 

 dusky brown near their ends. Upper wing coverts chiefly grey, with 

 dusky brown on each side of their shafts, and a strong shading of buffy 



Larus glaucodes. 

 P. U. O. C. 7909. 



Female. Immature. 

 About 5/ natural size. 



Fig. 127. 



at their ends and margins. Tail white, with an irreg- 

 ular amount of deep, dusky brown near the. end of 

 each feather; together these brown regions form a 

 subterminal band. Below white, no blush of pink. 

 A few dusky feathers indicate the coming hood on 

 the throat. Bill reddish yellow. Feet and legs yel- 

 lowish brown. Another bird of the year (9, 7910 P. 

 U. O. C, Cape Fairweather, Patagonia, 7 February, 

 1898) appears much like an adult in winter plumage. 

 The back of the head shows a strong shading of buffy 

 brown, which also appears on the auriculars. There 

 is a dusky area just in front of each eye. The wing formula, as shown in 

 Fig. 128, and the large amount of brown and buffy markings on the 

 mantle clearly indicate the age of the bird. The secondaries are, however, 

 chiefly grey, as are the upper wing coverts, and the under wing coverts 



Lams glaiicodcs. Gar- 

 rett collection. Female. 

 Immature P. U. O. C. 

 7910. About Yt^ nat- 

 ural size. 



