BUBO. 263 
a’. Lower parts barred with dusky, but without stripes; anterior upper parts des- 
titute of stripes; iris bright yellow. (Subgenus Bubo.) 
Adult: Above vermiculated with blackish on a dull grayish or grayish 
brown ground-color (sometimes almost white), the outer webs of quills 
marked with quadrate spots of lighter and darker, and tail crossed by 
about seven narrow bands of mottled dusky ; eyebrows and lores whitish ; 
part of throat and middle of chest white; rest of lower parts more or 
less ochraceous or tawny (tips or exposed portion of feathers usually 
whitish), the sides, flanks, ete., distinctly and regularly barred with 
dusky. Young: Quills and tail-feathers as in adult; rest of plumage 
dull buffy or ochraceous, everywhere barred with dusky. Male: Length 
18.00-23.00, extent about 49.00-52.00, wing about 14.50-15.25, tail 8.25, 
weight about 3} pounds. Female: Length 22.00-25.00, extent about 
57.00, wing 16.00, tail 9.00. 
o'. Darker colored, with dusky markings more extensive or more numerous (or 
both), the plumage usually with much mixture of tawny or ochraceous. 
ce’. Moderately dark-colored, the face usually more or less rusty, and the 
plumage usually with an excess of ochraceous or tawny rufous. 
Eggs 2.20183. Hab. Hastern North America, south through 
eastern Mexico to Costa Rica. i 
375. B. virginianus (GmeL.). Great Horned Owl. 
c. Extremely dark-colored, the face usually sooty brownish, mixed with 
grayish white, the plumage usually without excess of ochraceous 
or tawny—sometimes with none. Egg (single) 2.24 x 1.90. Hab. 
Northwest coast, from Oregon north to Alaska; Labrador. 
375c. B. virginianus saturatus Rivew. Dusky Horned Owl. 
b'. Lighter colored, with the light grayish and buffy tints of the ground-color 
largely prevailing over the darker markings, the lower parts purer white. 
c. General aspect of plumage above grayish, with more or less of buffy 
admixture; dark markings of lower parts distinct. =Hggs 2.18 x 1.85. 
Hab. Western United States (except northwest coast), eastward across 
Great Plains (straggling to northern Illinois, Wisconsin, and western 
Canada), north to Manitoba, south over table-lands of Mexico. 
875a. B. virginianus subarcticus (Hoy). Western Horned Owl. 
ce. General aspect of plumage above white, through fading of the ground- 
color and restriction of dark markings; beneath pure white, with 
dark markings, usually much restricted. Eggs 2191.91. Hab. 
Arctic America, chiefly in the interior; south, in winter, to northern 
Rocky Mountains and Great Plains (Dakota, Montana, etc.). 
375). B. virginianus arcticus (Swarns.). Arctic Horned Owl. 
«. Lower parts striped with black, but without bars; anterior upper parts also 
striped with black (the ground-color, both above and below, ochraceous) ; iris ° 
deep brown. (Subgenus Rhinoptyna Kavr.') 
1 Rhinoptynx Kaur, Contr. Orn. 1852, 114. Type, Strix mewicana, GMEL. 
