234 AVES : ANSEKES. XXXV. 



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

 S. to N. J. (Eu.) (Lat., conspicuous.) 



362. OIDEMIA Fleming. (01817/10, swelling.) 



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

 no white on wings. (Oidemia.) 



712. O. americana Swainson & Richardson. AMERICAN BLACK 

 SCOTER. ^ entirely black; 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. (Melanitla 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 s ty brown. L. 21. W. 11. N. 

 Am., S. to Md. 



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

 wings; nostrils beyond middle of bill. (Pdionetta 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 (epoyia, prop ; ovpa, 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. 1 7. W. 6. T. 3 J. N. Am., frequent ; an 

 expert diver. 



364. NOMONYX Ridgway. (i/o'/zos, regularity ; owg, nail.) 



716. N. dominions (L.). Redder than the last; forehead and 

 chin black. L. 13. W. 6J. Trop. Amer., straying N. to Wis., 

 etc. (From San Domingo.) 



365. CHEN Boie. (^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 ; lamellae very promi- 

 nent. L. 30 to 38. W. 17. T. 6. B. 2J. 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- 

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



