234 AVES: ANSERES. — XXXV. 
known by the bill. L. 22. W.11. T.4. Northern regions; 
S.toN.J. (Eu.) (Lat., conspicuous.) 
362. OIDEMIA Fleming. (oidyua, 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 black; 9 sooty brown, paler below and on 
throat. L.17to 20. W.10. T. 4. N. Am., coastwise; S. to N. J. 
aa. Billin ¢ broadly encroached upon by frontal feathers; nostrils beyond 
middle of bill; a large white wing patch. (Melanitta Boie.) 
713. O. deglandi Bonaparte. WHITE WINGED ScoTEeR. SuRF 
Duck. ¢ black; white spot under eye and white on wings; bill 
orange-tipped ; feet orange; Q 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.). Surr Duck. Sea Coor. ¢ black, 
with white spot on forehead and nape; Q sooty brown; white patch 
on lores and cheeks; size of O. americana. N. Am., coastwise. 
(Lat., conspicuous. ) 
363. ERISMATURA Bonaparte (épesopa, prop; ovpa, tail.) 
715. E. rubida (Wilson). Ruppy 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.6. T. 34. N.Am., frequent; an 
expert diver. 
364. NOMONYX Ridgway. (vépos, regularity ; dvvé, nail.) 
716. N. dominicus (L.). Redder than the last; forehead and 
chin black. L.134. W. 64. Trop. Amer., straying N. to Wis., 
etc. (From San Domingo.) 
365. CHEN Boie. (yn, goose.) 
717. C. ccerulescens (L.). BLur 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; lamelle very promi- 
nent. L. 30 to 38. W.17. T. 6%. B. 24. 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- 
Briiu. Grayish-brown, mottled, forehead and tail coverts white ; 
