2124 The Zoologist— May, 1870. 



" Third Winter. — Except for the plumage difference in the wing, 

 this age is very like the adult. The feel are duller, more black and 

 less brown, and have little or no orange lints through them ; the lips 

 generally less conspicuously red ; the orbits brownish, though fre- 

 quently red; the bill generally with dusky clouds at its base, but 

 this, after second winter, is not a rule." 



In my account of the kittiwake plumage (S. S. 552) after No. 12, I 

 make the bird adult. Since writing this, however, I find that I can 

 trace immaturity for another year, so that the kittiwake would not 

 breed till four instead of three years. This stage is well defined. 

 Read No. 13. Third IViuler. — As the adult, but that the pencil 

 feathers of the wing and those that form the extreme primary coverts 

 and which lie solely over the first primary quill are more or less 

 clouded with black, sometimes only a spot on the pencil, and 1 believe 

 that even at times this spot is wanting. This age is very distinct from 

 the glaringly apparent second winter. The feet, bill, &c., I could not 

 define from the adult. The orbits, however, are never so red. 



No. 14. Link 6. Third SpriiKj. — Change from winter to summer. 

 The head turns pure white, the orbits increase in red, the feet get 

 more yellow into the brown. 



No. 15. Fourth Summer. — Much like the adult, but as the wings 

 moult but once a year and that in autumn, the black markings are still 

 apparent about the pencil. At this age it associates with the yomig 

 birds of one and two years old, and is found quite away from the 

 breeding haunts. This is undoubtedly the barren kittiwake of 

 authors. 



After the next autumnal moult there is certainly no difference from 

 ihe adult. 



H. Blake-Knox. 



Marcb, 1870. 



Extracts from a Memoir intituled 'A Monograph of the Atcidce.'' 

 By Elliott Coues, A.M., M.D. 



(Continutd from Zod. S. S. 2091). 



Geuus Ceratoruyncua, Bonaparte. 



Base of upper mandible with a large upright horny protuberance. 



Under mandible with an accessory corneous piece interposed between 



ils rami, near their symphysis. Bill shorter than the head, stout, very 



deep at the base, tapering rapidly to the tip, much compressed, the 



