320 Dr. E. Lonnberg on a remarkable Capercaillie. 



These measurements are all a little smaller than those 

 of the corresponding parts of a typical Swedish Caper- 

 caillie, in which the length of the wing varies from 380 

 to 410 mm. Thus the variety in this connexion falls only 

 10 mm. short of the minimum of typical specimens. With 

 regard to the tail, however, the difference is more striking. 

 In the typical race the length of this member is from 315 

 to 340 mm. The difference in breadth and shape of the 

 single tail-feathers is just as important. The rectrices of a 

 typical Swedish Capercaillie measure from 56 to 76 mm. in 

 breadth and are, as is well-known, squarely truncate at their 

 ends. Compared with this the same feathers of the variety 

 described above are very narrow, as may be seen from the 

 measurements quoted. The shape is shown in the figure 

 (text-fig. 1). It will there be seen that the end of each 



Text-fig. 1. 



End of the fifth tail-feather of Tetrao urogalhis lugens. 

 (Two-thirds nat. size.) 



feather is rounded, while its structure also differs from the 

 normal, in that the inner web is not much broader than 

 the outer. 



This description is based on the two specimens which I 

 have obtained, but I have ascertained from Mr. Merilainen, 

 Helsingfors, that two others which be formerly possessed 





