ANATIOt;— THIO SWANS, (iKESK, AND DICKS. 115 



Chen hyperborea nivalis RlDOW. Vroc. Biol. 800. Wash. ii. 18(H, 107; Man. N. Am. B. 

 1887. 115.— A. O. U. Check List, 1886, No. lG9a. 

 Tadorna nivea Bbehm, Vok. Deutschl. 1831, HiA. 



Hab. Eastern North America; breedinK grounds unknown, but probably region be- 

 tween MoKenzio River and Hudson's Bay; migrating south in winter through eastern 

 United States, including Mississippi Valley, to the Gulf coast, even reaching Cuba; occa- 

 sional or accidental in the Bermudas. 



ScBSP. Chab. Entirely similar to f!. hyperborea except in size, being considerably 

 larger; young somewhat darker in color than in true C. hyperborea? 



Total length, about 30.00-38.00; wing. 17.:V.-17..5« (17.42); culmen. 2.55-2.70(2.63); tarsus. 3.15- 

 .1,30 (3.28); middle toe,2.60-2.S0 (2.70). 



This is simply a larf^er rare of the Snow Goose, and occurs 

 with the smaller form throughout the Mississippi Valley duriup; 

 its migrations. Mr. Nelson is of the opiuiou that in Illinois the 

 two occur in about equal numbers. Farther eastward, however, 

 particularly along the Atlantic coast, the larger form is decidedly 

 the prevailing one, while west of the Rocky Mountains it prob- 

 ably does not occur at all, though the smaller race is abundant 

 there. 



According to Mr. Boardinan, it is common during migration 

 in ea.stern Maine, and it is said to be more or less common, 

 according to the locality and other circumstances, at various 

 points along the coast farther south. 



(Jen us ANSER Brisson. 



Anser Briss. Orn. i, 1760. 261. Type. Anas nnser Linn..=j4. cinereus Meyek. 



Gen. Cbab. Bill much weaker or less swollen than In Chen (depth through base less 

 than half the length of the imlmen): plumage never white,' nor with white head, nor 

 bluish wlng-coverts. 



This genus differs from f'/nn chiefly in the form of tlie bill, 

 which is much less robust, more depressed terminally, the nails 

 thinner and less arched, the tomia less divergent, etc. In fact, 

 the bill of some species is quite identical in form with that of 

 larger species of lirfinta {cmtaflmmx and hntchlnul!,). The type 

 f)f the genus, however, A. {cLimrem Meyer), has the bill decid- 

 edly appro.xi mating to that of Clu'n, the commissure gaping 

 quite widely. Only one species occurs in Amenca, tin; common 

 White-fronted Goo.se (Anxir f/iiioh<>li Hartlauh). The same 

 species occurs also in Kurope in a representative form — the A. 

 albifroHH Gmei.. The difference between them is chiefly one of 

 size, the American bird being decidedly the larger. Another 



•Except Homi'tlmes In spncies which havi' heen long domeBticatod. 



