419 



cannot be used — which is unfortunate, as it would have been perhaps the most appropriate for 

 this northern Gull. 



I have not deemed it necessary to figure this Gull, as it differs from Larus leucophceus and 

 Larusfuscus merely in shade of colour and in the peculiar slate-coloured margins to the quills. 



In the preparation of the above article I have examined the following specimens : — 



E Mus. H. E. Dresser. 



a, 6 ad. Yooshina, Petchora, June 25th, 1875 (Seebohm If Harvie-Brown) . b, <S ad. Yennesei, June 5th, 

 1877 [H. Seebohm). 



E Mus. H. Seebohm. 



a,6 ad., b, ? ad. Petchora, June 1875 [Seebohm fy Harvie-Brown). c, 3 ad. Yennesei, June 5th, 1877. 

 d, $juv. Yennesei, July 29th, 1877. e, %juv. Yennesei, August 3rd, 1877 (H. Seebohm). 



