234 AVES : ANSE11ES. — XXXV. 



known by the bill. L. 22. W. 11. T. 4. Northern regions; 

 S. to X. J. (Zsu.) (Lat., conspicuous.) 



362. OIDEMIA Fleming, (oldrjfia, swelling.) 



a. Bill in $ scarcely encroached upon by frontal feathers; nostrils median; 

 no white on wings. (Oidemia.) 



712. O. americana Swainson & Richardson. American Black 

 Scoter. £ entirely Mack; 9 sooty brown, paler below and on 

 throat. L. 17 to 20. W. 10. T. 4. N. Am., coastwise; S. to N. J. 



aa. Bill in tf broadly encroached upon by frontal feathers; nostrils beyond 

 middle of bill; a large white wing patch. (Mtlanitla Boie.) 



713. O. deglandi Bonaparte. White Winged Scoter. Surf 



Duck. $ black ; white spot under eye and white on wings ; bill 



orange-tipped ; feet orange; 9 sooty brown. L. 21. W. 11. N. 



Am., S. to Md. 



aaa. Bill in & narrowly encroached upon by frontal feathers; no white on 

 wings! nostrils beyond middle of bill. (Pelionetta Kaup.) 



714. O. perspicillata (L.). Surf Duck. Sea Coot. $ black, 

 with white spot on forehead and nape ; 9 sooty brown ; white patch 

 on lores and cheeks ; size of 0. americana. N. Am., coastwise. 

 (Lat., conspicuous.) 



363. ERISMATURA Bonaparte (epeio^ia, prop ; ovpd, tail.) 



715. E. rubida (Wilson). Ruddy Duck. Chiefly brownish or 

 tawny, glossy chestnut in full plumage ; considerably waved and 

 dotted, lower parts mottled silver-white ; crissum white ; 9 brown, 

 mottled with dusky. L. 17. W. G. T. 3^. N. Am., frequent ; an 

 expert diver. 



364. NOMONYX Ridgway. (vofxos, regularity ; 5w£, nail.) 

 71G. N. dominicus (L.). Redder than the last; forehead and 



chin black. L. 131. W. 6 \. Trop. Anier., straying N. to Wis., 



etc. (From San Domingo.) 



365. CHEN Boie. (xr)i>, goose.) 



717. C. ccerulescens (L.). Blue Goose. Grayish brown, the 

 rump and wing coverts gray ; size and form of next. N. Am., rare. 

 (Lat., bluish.) 



718. C. hyperborea (Pallas.) Snow Goose. Adult pure 

 white, washed with reddish on head ; the primaries black ; young 

 bluish ; feet reddish, the claws dark ; bill red ; lamella? very promi- 

 nent. L. 30 to 38. W. 17. T. G£. B. 2\. N. Am., chiefly W. 

 The form E. of the Rocky Mts. is var. nivalis Forster ; larger than 

 the Western bird. (Lat., far-northern.) 



366. ANSER Brisson. (Lat., goose.) 



719. A. albifrons Gmelin. White-fronted Goose. Speckle- "^ 

 BlLL. Grayish-brown, mottled, forehead and tail coverts white; 



