260 



8 



Words, as the veins in the eggs become developed ; thus one finds in the same nest eggs of a light 

 green, olive-green, and yellowish brown colour." In Dresser's collection is a large series of eggs 

 of almost all the above varieties, obtained from Greenland and Lapland, which in size vary from 

 lo by fo t0 to b y lo m °h respectively. 



The specimens figured in summer plumage were obtained in Norway, and are those we have 

 also described; on the same Plate, in the foreground, we have figured the young bird of the 

 year ; these, as well as the specimens described, are in Dresser's collection. On the same Plate 

 as the winter plumage of Plectrophanes nivalis we figure the winter plumage of the present 

 species. 



In the preparation of the above article we have examined the following specimens : — 



E Mus. H. E. Dresser. 



o } 6, b,2- Dovre, Norway, June (R. Collett). c, ? . Europe {Gardner). d,juv. Plaistow, Kent, October 4th, 

 1871 {Davy), e, 6. Greenland {Erichsen). f, 6. Fort Liards, Hudson's Bay {Coues). g, 6 ■ Davies 

 Straits (P. Henderson) . h, i, 6 . N. America {Krider) . j, <$ . Koshkonong Prairie, Dane County, Wis- 

 consin, May 6th {Dr. Brewer) . k, ? . Fort Simpson, May 26th {B. R. Ross) . l,juv. Fort Simpson, Arctic 

 America, September 10th, 1860 {Coues). 



E Mus. H. B. Tristram, 

 a, b. . c, d, e. Tientsin, November {R. Sivinhoe) . 



E Mus. T. E. Buckley, 

 a, 6. Lapland, July 24th (T. E. B.). b, ? . Lapland, July 27th {T. E. B.). 



