MARECA. 191 



158. POLIONETTA 20N0RHYNCHA (Swinhoe). 

 ZONE-BILLED DTJCK. 



Anas zonorhyncha Swinhoe, Ibis (1866), 394: Salvadobi, Cat. Birds Brit. 



Mus. (1895), 27, 211. 

 Polionetta zonorhyncha Sharpe, Hand-List (1899), 1, 217; McGregor and 



Worcester, Hand-List (1906), 37. 



Calayan [McGregor) . Eastern Siberia, Mongolia, China, Japan, Kurile Islands. 



"Adult male. — Upper part of head and a broad stripe from lores 

 through eyes to some distance behind them dark brown; superciliary 

 stripe, sides of head, and throat whitish; from gape toward eyes a 

 slightly indicated dusky band, formed by dusky streaks; upper parts 

 brown, back and scapulars paler, with edges of feathers pale grayish; 

 rump and upper tail-feathers uniform dark brown; lower part of fore 

 neck and upper breast dull whitish buff, with centers of the feathers 

 dusky; lower breast and abdomen almost uniform brown, deepening into 

 black-brown on under tail-coverts; wings brown; speculum glossy blue, 

 more or less with a green luster, bordered anteriorly and posteriorly by 

 two velvety black bands; tips of the secondaries narrowly edged with 

 white; tertials brown, with only the apical part of outer web white; tail 

 brown, the edges of the feathers whitish. 'Bill black, with the apical 

 portion, except the tip of the nail, yellow, no red spots at base ; feet light 

 bright red, the web slightly dusky; iris yellowish brown." (Hoist.) 

 Length, about 580; wing, 295; tail, 117; culmen, 56; tarsus, 44. 



"Female. — Smaller and paler, the feathers of the breast for a greater 

 extension than in the male having broader whitish edges. 



"Young. — Paler even than the female, with smaller dusky spots on the 

 under parts; edges of upper wing-coverts pale; a broad subapical white 

 band across the greater wing-coverts, and the outer web of tertials for the 

 most part white." (Salvadori.) 



On December 7, 1903, a dozen birds of this species were observed in 

 Calayan. A female, the only specimen killed, measured 560 in length; 

 wing, 267; tail, 99; exposed culmen, 53; bill from nostril, 42; tarsus, 44; 

 middle toe with claw, 37. Bill jet-black with a broad tip of bright yellow; 

 most of the nail black; iris tan-brown; legs and feet light salmon; nails 

 black; webs dusky. 



Genus MARECA Stephens, 1824. 



Bill small, shorter than head, depressed and slightly narrowing toward 

 tip, nail large; wings long and pointed. 



