NATURAL SCIENCES OF PHILADELPHIA. 131 



lae appearing prominently below the edge of the upper mandible Bill and 



feet light colored; colors of plumage generally sober, the shades of brown 

 and gray predominating. 



Species Arise?- hyperboreus, Pall. N. America and West Indies. 

 " rossii, Baird. Central regions 11. 15. Terr. ; Cain. 

 " cmrulescens, L. Central U. S. ; Hudson's Bay. 

 " ferus. ? Pr. William's Land. 

 " segetum, Gm. ? Hudson's Bay. 

 " gambelli, Hartl. N. America. 



2. BRANTA SCOPOLL* 



Gen. Char. Bill short, lamelhe not projecting below upper mandible. Bill 

 and feet black; neck always black. 



Species Branta canadensis, L. N. America. 



" hutchinsii. Rich. & Sw. N. America. 

 " bernicla, L. Eestern and central N. America. 

 " nigricans, Lawr. West coast of N. America. 

 " leucopsis, Bechst. N. E. of N. America. Rare, 

 b. Aberrant. Plumage with metallic reflections on speculum ; colors of 

 sexes not invariably similar. Membrane of toes somewhat scolloped out in 

 front. 



3. ORESSOCHEN, n g. 



Gen. Char. Bill very robust, light colored, lamella; not projecting. Fret 

 robust, light colored, hallux well developed. Plumage of sexes similar; 

 colors simple. 



Species Oressochen melanopterus, Gay. Highland regions of Chili. 



4. CHLCETROPHUS, n. g. 



Gen. Char. Bill moderate, black. Feet particolored, black and orange. 

 Colors of sexes similar. Plumage rather brilliant for this subfamily. 



Species Chlcelrophus poliocephalus, Gray. Coasts of Patagonia and adjacent 



islands. 

 ' rubuliceps, Sclater. Falkland Islands. 



5. CHLCEPHAGA, Eyton. 



Gen. Char. Bill as in the last genus. Feet varying in color with the sex 

 black in the male, yellow in the female. Plumage of the two sexes quite dif- 

 ferent, and generally less bright colored than in Chlcetrophus. 



Species CIdoephaga magellanica, Gm. Chili and Patagonia. 

 " * picta, Gm. " " 



Section B. Philactese. Skull with well marked rough superorbital depres- 

 sions. Tarsus as short as or shorter than the middle toe with its claw. Hab- 

 its littoral. 



6. PHILACTE, n. g. 



Bill short, moderately robust, light colored, nail of both upper and lower 

 mandibles quite prominent, lamellae appearing as pointed processes in the 

 posterior part of the commissure. Feet moderate, light colored. General 

 tint of plumage light, no metallic reflections. 



Species Philacte canagica, Lewast. N. W. coast of N. America ; ? Caspian. 



* The genus Brante was adopted from Klein by Scopoli in 1769, the first species being 

 Anas bernicla, L. This, according to usage, will have to be substituted tor Bernicla of Boie 

 (Isis, 1822), and also antedates his genus Branta, established at the same time, the type of 

 which is Anasrufina, Pall. 



1870.] 



