AVES LARID^E. 20$ 



Adiilts in Winter. Without the hood for a brief period only. No 

 rosy blush on the lower parts. Otherwise much like breeding adults in 



color. 



FIG. 123. 



Larus maculipennis. Profile of head. From material in the American Museum. Natural 

 size. Immature. 



Young birds of the year, have the head white, with indistinct greyish 

 brown on the occiput and in the auricular region. The mantle and upper 



FIG. 124. 



Larus maculipennis. Wing. ^ natural size. Immature. From material in the American 

 Museum. 



wing coverts grey with brownish mottling. The five outer primaries 

 sooty brown terminally and on their inner webs, with greyish white indi- 

 cations of the ultimate quill pattern on the two first ; the other quills with 

 whitish bases, and generally in pattern like the adult, but with the pro- 

 portion of greyish black greater. The secondaries have ashy brown 

 centers. There is a greyish black terminal band on the tail. At a later 

 age the decorations on the three outer quills become more defined. (See 



