1888.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



75 



analogy with other Marsh-tits should be more "rufous," as it is termed 

 in the translation of Fatio's memoir already alluded to, if there bo auy 

 seasonal change in the plumage of P. borealis, which is denied by 

 Dresser. The latter author, however, seems to believe in a special sum- 

 mer plumage of the female (torn, cit., p. 108). Upon looking over the 

 list of specimens examined by him, at the end of his article (p. 118), I 

 think there are reasons for suspecting that the alleged summer females 

 represent the Norwegian form, P. colletti. Holmgren (loc. cit., p. 1S2) 

 says that the winter plumage of P. borealis is purer gray than the sum- 

 mer plumage, but this statement is so contrary to the observations of 

 others that it can not be accepted without confirmation. 



I. — Measurements of Tarns colletti. 



113220 



113225 



Collector. 



Berg. Mus 

 ...do 



cfad. 

 $ad. 



Locality. 



Bergen, Norway . 

 — do 



Type 



II. — Measurements of Par us borealis. 



III. — Measurements of Par us montanus. 



