218 BRITISH BIRDS. 



14. — Regulus eegultjs anglorum Hart. 

 British Goldcrest. 

 Regulus regulus anglorum Hartert, "Bull. B.O.C.,"" XVI., 

 p. 11 (1905). 

 Differs from B. regulus regulus of continental Europe as 

 follows : the upper surface is darker, more olivaceous, the 

 under siu'face is slightly duller, the size, as a rule, less. Wing 

 mostly from 51*5 to 54, exceptionally 55 and even 57 mm. 

 [The north European form frequently crosses over to 

 Great Britain in flocks in autumn and winter.] 



15. SiTTA EUROPAEA BRITANNICA Hart. 



British Nuthatch. 

 Sitta europaea britannica Hartert, "Nov. Zool," 1900, 

 p. 526 (England : type from Tring). 

 Differs from S. europaea europaea {terra typica : Sweden) 

 in having the underside buff instead of white, from 

 S. europaea caesia {terra typica : Germany^ in having the 

 chestnut colour on the flanks lighter, the breast and 

 abdomen more or less paler, often strikingly pale, the bill 

 generally more slender and more pointed, and the culmen 

 mostly higher arched and more sharj)ly ridged. 



16. — Certhia familiaris brittanica Ridgw. 

 British Tree-Creeper. 

 Certhia brittanica (!) Ridgway " Proc. U.S. Nat. Mus.,"V., 

 p. 113 (1882— England). 



Differs strikingly from C. familiaris familiaris {terra 

 typica : Sweden) in its rufescent-brown upper surface, and 

 from G. fatniliaris macrodactyla {terra typica. : Middle Ger- 

 many) in having the rump more rufous, and, in freshly 

 moulted specimens, the whole upper surface more rufescent; 

 the bill is as a rule visibly longer. 



[It is remarkable that only this form occurs, at least 

 during the breeding season, in the British Isles, and that 

 Certhia brachyclaclyla is unknown. On the Continent 

 most countries are inhabited by two different creepers : a 

 form of C. familiaris and a form of C. brachydactyla.] 



