1 68 



The majority of the above measurements have been extracted from British Antarctic {'Terra Nova') 

 Expedition, 1910, Lowe and Kinnear (1930). 



The specimens referred to "Tring Museum" are now in America. 



It is of particular interest that the two longest series of specimens have the greatest 

 variability in length of wing and tarsus, thus suggesting that a short series may well fail 

 to exhibit the degree of variation to which a group is liable and is therefore the worse 

 basis for subspecific differentiation — a point which has apparently been overlooked 

 occasionally in the past. 



