20 ARKIV FÖR ZOOLOGI. BAND 12. N:0 7. 



themselves hybrids between Larus marinus and L. glaucus. 

 I owe this to the courtesy of the owner, Mr. Scheel and 

 Professor Ad. Jensen, who kindly has arranged the matter. 



The 3^oungest of these hybrids of the fg-generation is a quite 

 young chick in down (Zool. Have ^^e 1899). I have compared 



Fig. 6. Nestling of second hybrid generation 



(c \ Larus marinus X L. glaucus 



v^a) — r ' r7~lF ; 



L. martnus X L. glaucus 



from Zool. Garden, Copenhagen. The specimen belongs to Mr. Scheel 

 It is seen obliquely from above to show the spottedness. 



it with young specimens of Larus marinus from Sweden, and 

 of L. glaucus from Beeren Eiland in a corresponding age. 

 The dark spöts of the head of the downy hybrid stånd out 

 quite boldly as in Larus marinus. In Larus glaucus the spöts 



