114 



NORTH AMERICAN BIRDS. 



transverse series of spots of ochraceous or creamy white ; these very obsolete on middle 

 feathers, and sharply, defined only on inner vi^ebs ; the last is terminal. Primaries plain 

 brown, somewhat darker than the back, and becoming insensibly darker terminally ; 

 skirted with white, and somewhat mottled or irregularly spotted toward their bases 

 with yellowish-white. Head and neck, each feather, with a medial streak of dusky, but 

 white the prevailing aspect ; these streaks condensed and somewhat suffused along 

 upper border of ear-coverts, and from the lores along cheeks, forming an obsolete " mus- 

 tache " ; every feather beneath (including lining of wings) with a medial broad stripe of 

 clear plumbeous vandyke-brown, the shaft pure black ; under surface of primaries with 

 transverse spaces of white, these numbering thirteen on the longest. Wing-formula, 

 2-3, 1. Wing, 15.00; tail, 9.20. 



Hab. Iceland and Southern Greenland. Northeastern North America in winter, 

 straggling accidentally south to the New England States ; Rhode Island (Museum, 

 Cambridge) ; Norway, Maine " not uncommon " (Verrill) ; Massachusetts (Peabody & 

 Jillson) ; Long Island (Cab., G-. N. Lawrence). 



ISTo. 56,050, Greenland (Schliiter Collection), is moulting, and assuming the 

 adult dress ; the adult and young stages above described being nearly equally 

 combined. No. 56,055, from Greenland, differs from the other young in- 



Falco islawKcvs. 



dividuals which I have seen in being considerably darker. The feathers of 

 the upper surface are not bordered with whitish, but are merely paler on 

 their edges, along which are specks of yellowish. On the head and neck 



