AXATID^. 87 



of lores, and ailvancincx finite to the 



nostril Arctonetta. (Pai^e 103.) 



?. Featlierini^ of firclioad sepurutecr from tliat 

 of lores by the interposition of a more or 

 less extensive naiced angle, or prolonga- 

 tion of naked skin of tlie liill. 



Somateria. (Page 108.) 



/'. Tail more tlian half as long as wing, much graduated, the 



feathers with narrow webs and very stiff shafts, their 



bases scarcely hidden bj' the short coverts. 



g^. Nail of bill very snjall, hardly visible from above, and 



bent abruptly backward beneath the tip of the 



upper mandible ; outer toe longer than middle. 



Erismatura. (Page 113.) 

 g''. Xail of bill normal (J.e. large, almost whollj- visible 

 from above, and not bent abruptly backward at 

 tip) ; outer toe shorter than middle. 



Nomonyx. (Page 114.) 

 e*. Lores wholly or partially naked ; wing inure than 12.00. 



Cairina.' (Page 100.) 

 <P. Lower portion of tarsus in front without transverse scutelliB. 



Dendrocygna. (Page 118.) 

 6'. Tarsus longer than middle toe, without claw. (Subfamily Anserina:.') 



&. Seri'ations on cutting-edge of upper mandible visible from outside for 



greater portion of the tomium, the latter decidedly sinuated, or 



concave. 



d}. Bill very stout, its depth through base equal to much more than 



half the length of the culmen ; color of adults white, with 



blackish primaries, or else with head and part of neck white, 



the wing-covcrts plain bluish gray Chen. (Page 114.) 



cP. Bill weaker and more depressed, its depth through base less than 

 half the length of the culmen ; color of adults never white, or 

 with white head, or bluish graj' wingcovcrts. 



Anser. (Page 115.) 



c*. Serrations on edge of upper mandible visible onl}- near angle of mouth. 



the tomium very slightly or not at all sinuated. 



d}. Nostril near middle of nasal fossae ; cutting-edge of upper mandible 



not appreciablj- or regularly sinuated ; bill and feet always 



cntirelj' black; head partiallj- or entirely black; tail-coverts 



and crissum white Branta. (Page 116.) 



(P. Nostril at lower anterior extremitj- of nasal fossm; cutting-edge 

 of upper mandible ap])reciabl3* and regularly sinuated, or con- 

 cave ; bill and feet light-colored ; head white (sometimes stained 



> Cairina Fleming, Phil, of Zool. 1322, 260. Type, Anat mo'chala Lisx. 



