E. LÖNNBERG, HYBRID GULLS. 



15 



extending further distally. The shaft is grey, distally white. 

 The other quills are grey with white tips. 



The fourth Gull from the Copenhagen Museum, which 

 has been obtained in a wild state, is labeled: »Larus marinus 

 X glaucus (»L. nelsoni»). Upernivik, Grönland 8. 9. 1886. 

 Insp. Feucher. 21. 1. 1898. 58.» Tt is of exceedingly great in- 

 terest to find the full resemblance and agreement with regard 

 to the pattern of the wing between this Gull and the one 



Fig. 5. Diagram of primaries of a Gull from Upernivik, Greenland, most 

 probably a hybrid Larus marinus X L. glaucus. 



just described. The head, neck, tail and entire under parts 

 are white. The mantle and outer Surface of wings bluish 

 grey, considerably darker than in Lams glaucus, almost of 

 the same shade as in L. argentatus. 



The first primary has a white tip, measuring a little more 

 than 6 cm, but it is distally worn off and has thus been 

 somewhat longer. Inside this white tip the outer web is 

 black, and the inner påle grey with the exception of a blackish 

 band along the shaft which is darkest distally and gradually 

 becomes paler in a proximal direction. The dimension and 



