332 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Downy young. — General color very pale buffy gray or dull grayish 

 white, becoming more decidely white on under parts of body; a 

 small spot in center of anterior portion of forehead, a loral streak, 

 and a stripe on each side of occiput dull black; crown and occiput deep 

 grayish brown, margined laterally with dull black, the black lateral 

 stripes unitmg posteriorly and extending as a single stripe down 

 median portion of nape; hindneck deep grayish brown intermixed 

 laterally with very fine filamentous streaks of dull whitish; lower 

 back and rump with a broad median stripe of dark grayish brown or 

 fuscous and two narrower lateral stripes of pale brownish gray, be- 

 neath which is a broad stripe of grayish brown; outer side of thighs 

 deep grayish brown. 



Adult male. —Wm^, 180-198.5 (187.8); tail, 71-83 (76.9); exposed 

 culmen, 52-61 (55.8); tarsus, 57-68 (60.7); middle toe, 32.5-40.5 

 (35.5). « 



Adult female. —Wing, 180-197 (188.9); tail, 71-83 (76.6); exposed 

 culmen, 53.5-58 (55.5); tarsus, 55-62.5 (59.4); middle toe, 33-37.5 

 (34.8).^ 



Breeding from Anticosti, Magdalen, and Mingan islands in Gulf 

 of St. Lawrence, Newfoundland, Labrador, etc., to southern Macken- 

 zie, Cook Inlet, Alaska (Mount Iliamna), and southern British 

 Columbia (formerly southward to northern Minnesota and Cook 

 County, northeastern Illinois?); migrating southward over whole of 

 United States, Middle America (including Bermudas and West 

 Indies), and South America, as far as Patagonia (Straits of Magellan) 

 and Chile (Antofagasta; Rio Pilmaguen; Sitana, Tarapaca; Tel- 

 cahuano; Santiago; Valparaiso); not yet recorded from Galapagos 

 Archipelago; accidental in western Europe (Tresco Abbey, Scilla 

 Island, Sept. 16, 1906). 



A sufficient series of specimens may possibly show differences in coloration between 

 eastern and western birds of this species. Some late spring adults of the latter have 

 much more white spotting on the upper parts (the black spotting being thereby 

 rendered more conspicuous) and the under parts more extensively marked with 

 dusky. 



