_? Strix wapacuthu_, GMEL. Syst. Nat. 1789, p. 290. _Strix (Bubo) arctica_, SWAINS. F. B. A. II, 1831, 86. _Heliaptex arcticus_, SWAINS. Classif. Birds, I, 1837, 328; IB. II, 217. _Bubo virginianus arcticus_, CASS. Birds N. Am. 1858, 50 (_B. virginianus_).—BLAKISTON, Ibis, III, 1861, 320. _Bubo virginianus_, var. _arcticus_, COUES, Key, 1872, 202. _Bubo subarcticus_, HOY, P. A. N. S. VI, 1852, 211. _Bubo virginianus pacificus_, CASS. Birds Cal. & Tex. 1854, and Birds N. Am. 1858 (_B. virginianus_, in part only). _Bubo magellanicus_, CASS. Birds Cal. & Tex. 1854, 178 (not _B. magellanicus_ of LESSON!). _Bubo virginianus_, HEERM. 34.—KENNERLY, 20.—COUES, Prod. (P. A. N. S. 1866, 13).—BLAKISTON, Ibis, III, 1861, 320. _? Wapacuthu Owl_, PENNANT, Arctic Zoöl. 231.—LATH. Syn. Supp. I, 49. CHAR. Pattern of coloration precisely like that of var. _virginianus_, but the general aspect much lighter and more grayish, caused by a greater prevalence of the lighter tints, and contraction of dark pencillings. The ochraceous much lighter and less rufous. Face soiled white, instead of deep dingy rufous. ♂ (No. 21,581, Camp Kootenay, Washington Territory, August 2, 1860). Wing, 14.00; tail, 8.60; culmen, 1.10; tarsus, 2.00. Tail and primaries each with the dark bands nine in number; legs and feet immaculate white. Wing-formula, 3, 2=4–5–1. ♀ (No. 10,574, Fort Tejon, California). Wing, 14.70; tail, 9.50; culmen, 1.10; tarsus, 2.10; middle toe, 2.00. Tail and primaries each with seven dark bands; legs transversely barred with dusky. Wing-formula, 3, 4, 2–5–1, 6. HAB. Western region of North America, from the interior Arctic districts to the table-lands of Mexico. Wisconsin (HOY); Northern Illinois (Pekin, Mus. Cambridge); Lower California; ? Orizaba, Mexico. Localities: (?) Orizaba (SCL. P. Z. S. 1860, 253); Arizona (COUES, P. A. N. S. 1866, 49). The above description covers the average characters of a light grayish race of the _B. virginianus_, which represents the other styles in the whole of the western and interior regions of the continent. Farther northward, in the interior of the fur countries, the plumage becomes lighter still, some Arctic specimens being almost as white as the _Nyctea scandiaca_. The _B. arcticus_ of Swainson was founded upon a specimen of this kind, and it is our strong opinion that the Wapecuthu Owl of Pennant (_Strix wapecuthu_, Gmel.) was nothing else than a similar individual, which had accidentally lost the ear-tufts, since there is no other discrepancy in the original description. The failure to mention ear-tufts, too, may have been merely a neglect on the part of the describer. Bubo virginianus, var. pacificus, CASS.