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). [Illustration: _Falco islandicus._] No. 56,050, Greenland (Schlüter 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 individuals 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 the dark streaks predominate, while the stripes below are very broad. It approaches quite nearly toward the young of var. _sacer_. The only specimen of this race which I have seen from Continental North America, is a young individual, obtained during the winter of 1864–65, near Providence, R. I., taken by Mr. Newton Dexter, and now in the Cambridge Museum, where I had the pleasure of seeing it. LIST OF SPECIMENS EXAMINED. National Museum, 5; Boston Society, 3; Philadelphia Academy, 9; Coll. G. N. Lawrence, 2; Museum Comp. Zoöl., 1; New York Museum, 5. Total, 25. _Measurements._ +----+-----------+-----------+---------+---------+-----------+----------+ |Sex.| Wing. | Tail. | Culmen. | Tarsus. |Middle Toe.|Specimens.| +----+-----------+-----------+---------+---------+-----------+----------+ | ♂ |14.35–14.75| 8.80–10.00| .91–1.00|2.20–3.00| 1.95–2.15| 9 | +----+-----------+-----------+---------+---------+-----------+----------+ | ♀ |16.25–16.50|10.00–11.50|1.00–1.05|2.30–2.70| 2.00–2.25| 10 | +----+-----------+-----------+---------+---------+-----------+----------+ Var. sacer, FORSTER. MacFARLANE’S GERFALCON. _Falco sacer_, FORSTER, Phil. Trans. LXII, 1772, 383 and 423.—COUES, Birds of New England, 1868, 6.—BAIRD, Trans. Chicago Acad. Sc. I, ii, 271. _? Falco cinereus_, GMEL. Syst. Nat. p. 267, 1789.