E. LÖNNBERG, HYBRID GULLS. 13 



banded and mottled with black. The primaries are so much 

 worn off, that the pattern of the tips of the primaries cannot 

 be discerned. Only on the first primary of one side a little 

 white can be seen, but if this is the last remnant of a large 

 apical spöt, or of a »mirror» is of course impossible to tell. 

 As these primaries belong to the last juvenile plumage they 

 could not be expected to show anything of the definitive 

 pattern, but their general blackness prove that thej^ are 

 similar to those of a yoiing L. marinus, and have no likness 

 with those of a L. glaucus of corresponding age. 



The third specimen from the Zoological Garden of Copen- 

 hagen is labeled »Bastard af Larus glaucus X marinus 5 ad. 

 Zoolog. Have ^Vi 1900». It shows also the plumage of a 

 fully adult bird. The head, neck, tail and entire under pa^ts 

 are white, the head and hind neck being narrowly streaked 

 with påle brownish. The mantle and upper surface of wings 

 is grey. The shade of this colour is much darker than in 

 L. glaucus, but paler and less bluish than in L. cachinnans 

 from Central Asia. It resembles nearlj'^ the colour of a swedish 

 Larus argentatus in winter-plumage. At the same time it must 

 be admitted that the exact shade of the mantle of this bird 

 is difficult to ascertain as it unfortunately gives the impres- 

 sion of having suffered during the time it has been preserved. 

 The pattern of the wing is very interesting (fig. 4). It is 

 only the first four primaries which are marked with both 

 black and white. The first primary has a 77 mm long, white 

 tip. Proximally of this the outer web is black along the 

 whole length of the quill. The inner web, on the contrary, 

 is not black, but grey inside the tip and has only a black 

 band along the shaft. This black band is distally, where it 

 is broadest, 17 mm, and it is there sharply defined as well 

 from the white tip as from the surrounding grey, but in a 

 proximal direction it is somewhat narrowed at the same time 

 as it gradually becomes paler, more and more grey and 

 finally, about 14 cm from its distal end, it blends into the 

 general grey of the inner web. The shaft is white, at least 

 in the middle, for its whole length. 



The second primary has also a white tip, about 6 cm in 

 length. On the outer web, it is foUowed by a 14,5 cm long, 

 black band. The proximal portion of the outer web is grey, 

 and this colour cuts in as a wedge between the shaft and 



