500 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



with a rather indistinct sub terminal luniile of dusky; bill dusky or 

 blackish for terminal half, orange-reddish basally; legs and feet pale 

 reddish (flesh color in life?). 



Downy young. — Upper parts very pale buffy grayish or grayish 

 buffy to wood brown or bright avellaneous, irregularly spotted or 

 marbled with blackish, except on forehead; forehead, suborbital 

 and malar regions, and throat grayish to sooty blackish; chest white 

 or brownish white, passing into very pale buffy grayish to light 

 buffy browm or drab on posterior and lateral under parts. 



Adult ?mZe.— Wing, 257-290 (272.5); tail, 148-202.5 (176.8); 

 exposed culmen, 29.5-42 (33.2); tarsus, 13.5-16 (14.9); middle toe, 

 15-17 (16.1).« 



Adult female.— Wmg, 238-277 (263.1); tail, 135-193 (165.5); ex- 

 posed culmen, 28-35 (31.1); tarsus, 13.5-15.5 (14.4); middle toe, 

 15-17.5 (15.9).*' 



Breeding from northern and western Alaska (Semechi and Amchitka 

 islands, Aleutian chain; Shumagin Islands; coasts of Norton and 

 Kotzebue sounds, Yukon Valley, Point Barrow, etc.), Melville 

 Island, northern Greenland, etc., southward to southern Alaska 

 (Yakutat Bay), northern British Columbia, Lower Slave Lake, central 

 Keewatin, Quebec (Point de Monts), Magdalen Islands, Maine, and 

 (formerly) coast of Massachusetts (Muskegat Island, etc.); migrating 

 southward along or near Atlantic coast to Long Island, rarely to 



o Twenty-two specimens. 



^ Sixteen specimens. 



Locality. 



MALES. 



Two adult males from northern Europe 



Three adult males from Disco Island, Greenland 



One adult male from Cumberland Gulf 



Two adult males from Xewfoundland (Funk Island) 



One adult male from Quebec (Rupert House) 



One adult male from Nova Scotia 



Two adult males from Massachusetts (Muskegat Island) . . . 



Nine adult males from Alaska 



One adult male from Bering Island, Kamchatka 



FEMALES. 



One adult female from Greenland 



One adult female from Cumberland Gulf. 



One adult female from Ungava (Fort Chimo) 



One adult female from Xova Scotia 



Thrflc adult females from Massachusetts (Muskegat lsland_) 



Eight adult females from Alaska 



One adult female from eastern Siberia ( Valley of Yenesai).. 



Wing. 



271 



269.3 



285 



276 



278 



265 



262.5 



273.2 



279 



277 



270 



257 



253 



241.7 



270.9 



260 



Tail. 



183.7 



174 



176.6 



193.7 



194 



164.5 



157 



173 



186 



193 



161 



151 



173 



152.7 



166.6 



190 



Ex- 

 posed 



cul- 

 men. 



Tarsus. 



33 



33 



33 



34.7 



32 



34 



30.5 



32.7 1 



42 



32 



31 



29 



31.5 



30.5 



31.5 



16 



14.7 



15 



15.7 



15 



15 



14.2 



14.8 



15 



15.5 



15.5 



14 



15 



14.2 



14.4 



14.5 



Middle 

 toe. 



16.5 



15.8 



16.5 



16.5 



16 



15.5 



15.7 



16 



16.5 



17 



16 



16 



16 



16.0 



15.2 



15.5 



