_Nyctea_, STEPHENS, Cont. Shaw’s Zoöl. XIII, 62, 1826. (Type _Strix
nyctea_, LINN. _N. Scandiaca_, LINN.).
Species and Races.
1. =N. scandiaca.= _Adult._ Color pure white, more or less barred
transversely with clear dusky, or brownish-black. _Male_ sometimes
almost pure white. _Downy young_, sooty slate-color. Wing,
16.00–18.00; tail, 9.00–10.00.
Dusky bars sparse, narrow, umber-brown. _Hab._ Northern parts of
Palæarctic Realm …
var. _scandiaca_.[29]
Dusky bars more numerous, broader, and clear brownish-black. _Hab._
Northern parts of Nearctic Realm …
var. _arctica_.
Bubo virginianus, var. virginianus, BONAP.