PLATE 13 
Skins of adult males of Anser albifrons albifrons (at left), Mus. Vert. Zool., 
no. 27581, and Anser albifrons vane cn right), Mus. Vert. Zool., no. 27134; 
photographed on same scale. 
These specimens are fairly representative of the size differences existing 
between the two forms. Both were prepared by the same person, and care was 
exercised that neither should be unduly lengthened or shortened. In each case 
the dried study skin measures in total length within a few millimeters of the same 
measurement as taken before the bird was skinned. 
[222] 
