<i.CA.lifomtcus 



Califorauj gull 



greenish.- 

 ^ yellow 



tnediuiri 

 dark 



a..smitlisonianu5 



American n.g. 



flesh 



very 

 ligKt 



A tKayeri 

 Thayer's gull 



flesh 



markedly 

 pale 



Vega herringguU 



bluish 

 flesh 



markedly, 

 dark 



a.kumlieni 



5 ^ 

 Kumliensgull 



flesh. 



very 



pale 



glaucoides 



Iceland gull 

 paleflesh 



extremely 

 pale 



A. birulai 



9 

 Birulds gull 



dull yellow - 

 flesh 



medium, 

 light 



f. graellsu 



17 

 British l.b.b. 



yellow 



extrernely 

 dark 



a.argentalus 



2 

 Herring-gull 



flesh 

 markedly 



a omissus 

 I 

 Scandinavian kg. 



V. fuse as 

 "^ 16 " 

 lesserhladhack 



yellow 



medium 

 light 



briaht 

 yellow 



almost 

 black 



f. heuglini 



14 

 Heaglins gull 

 yellow 



dark 



_f,antelius 



15 

 Siberian l.b.b. 



yellow- 

 orange 



dark 



a.mongoltcus 



to 



Hongoliank.-g. 



yellow- 



flesh 



medium 

 light 



a.csiccriinans 

 II 



Yellow- legged L-g. 

 yellow 



light 



a.michahelles 

 12 



Mediterranean h.g 

 yellow 



medium 



a.a.tlantis 

 13 



Madeiran h.g. 

 maize 

 yellow 



medium 

 dark 



Fig. 4 



Breeding distribution and relationships of all subspecies of Larus fuscus, 



L. argentatus and related forms. 



a Diagram of forms, with leg and mantle-colour 



