148 BIRD-LIFE OF THE BORDERS 



i. ABSOLUTELY STATIONARY SPECIES 



That is, those birds as to which NO EVIDENCE EXISTS 

 of a regular migration. 



(i) DIPPER {Cinclns aquaticus). 



The evidence of arrivals from over-sea on the N.-E. coast is too 

 trivial to consider. Dippers, it is true, have been exceptionally 

 recorded, as, e.g., from the Isle of May in August — another at same 

 spot (specifically stated to have belonged to the " British form " ) on 

 April 22nd. These exceptions, I overlook. 



Those few dippers which, in autumn, reach East Anglia (where 

 the species is otherwise unknown) belong to the continental form, 

 C. melanogaster. 



(2) Tree-Creeper (Certhia famittaris). 



(3) Marsh-Tit {Parus palustris, subsp. dresseri). ^ 



(4) COAL-TlT {Parus ater, subsp. britannicus). J 



In both these, the British race is subspecifically distinct from the 

 continental. Our insular varieties are stationary. 



A few of typical P. ater (as well as A. caudata — rosea) do cross 

 the North Sea ; but in such trifling numbers as to be negligible. 



(5) LONGTAILED TlT {Acredula caudata, var. rosea). 



Here again we have a stationary insular form, subspecifically 

 distinguishable from true A. caudata of Linnteus, by its duller 

 colours, and absence of the white head. 



Of the latter Mr Saunders and I found, in Norway, a nest of 

 pendulous form, not hitherto noticed in these islands. 



(6) Great Spotted Woodpecker {Dendrocopus major). 



The precise status of this species is elsewhere defined {Fascicula, 

 p. 132). At intervals of years, occur irregular invasions from over- 

 sea — reinforcing our sedentary stock. I place the bird in the list of 

 RESIDENTS because the said invasions are wholly irregular and 

 unsystematic. 



(7) Jay {Garrulus glandarius). 



The same remarks apply to this as to the last-named species. 



(8) Magpie {Pica caudata). 



The recorded occurrences at sea are so few, and so irregular 

 that they may best be regarded as accidental. 



