220 BRITISH BIRDS. 



apparently, not separable from those of Central Europe 

 and Northern Europe in general — I have not been able to 

 study Troglodytes beyg&mis — those from St. Kilda have 

 been separated, as above. There is no doubt that St. 

 Kilda Wrens are larger than those from Great Britain, the 

 wing being longer (about 55 mm.), and the feet a little 

 stronger. The difficulty is, however, how to separate it 

 from Troglodytes troglodytes horealis of the Faroe Islands. 

 Unfortunately I have only been able to compare a very 

 few specimens from St. Kilda, and, moreover, I suspect 

 that all, with the exception of the type in the British 

 Museum, have been for a time in spirits, and are therefore 

 faded. If this is not the case the St. Kilda Wren is 

 evidently paler on the under surface than T. t. horealis, 

 while the dimensions are about the same, and probably 

 the barring on the back and abdomen is stronger in 

 T. t. hirtensis, but as these characteristics vary a great 

 deal, it is desirable to examine a better series from St. 

 Kilda. Even T. t. horealis from the Faroe Islands is most 

 closely allied to T. t. troglodytes, and there is a specimen 

 from Fair Isle, collected by Messrs. W. Eagle Clarke and 

 Kinnear, which has the wing fully as long as the birds 

 from the Faroe Islands, while other specimens from Fair 

 Isle are not at all larger than those from Great Britain. 



The Iceland Wren is still larger than T. t. horealis, and 

 I have recently separated it as T. t. islandicus. 



I may add that I see no necessity for the separation of 

 the genera Troglodytes and Nannus, but if this separation 

 is made the latter must be called iVaTiwws Billberg, 1828. 



19. CiNCLUS CINCLUS BRITANNICUS Tsch. 



British Dipper. 



Cinclus cinclus hritannicus Tschusi, " Orn. Jahrb.,^' XIII., 

 p. 69 (1902 — Beaufort Castle, Scotland, etc.). 



The British Dipper differs from Cinclus cinclus aquaticus 

 of Germany at a glance by its deep, predominantly 

 blackish upper sm-face and dark crown, from Cinclus 



