Above black; a large white patch on the middle of the wings: legs red.
U. Grylle, Teinrn. Man. d'Orn. torn. ii. p. 925. Black Guillemot, Mont. Orn. Diet, & Sitpp. Bew. Brit. Birds, vol. ii. p. 170. Selb. Must. vol. ii. p. 426. pl. 80.
Entire length thirteen inches six lines: length of the bill (from the forehead) one inch two lines, (from the gape) one inch five lines; of the tarsus one inch two lines; of the tail one inch nine lines; from the carpus to the end of the wing six inches seven lines.
(Adult in winter). Crown, nape, and all the rest of the upper plumage, sooty black, with the exception of the middle and greater coverts, which are white, forming a large patch of this last colour on the middle of the wing: sides of the face, and all the under parts, white: bill black: irides brown: inside of the mouth, and legs, reddish. (Summer plumage). The whole plumage above and below, with the exception of the large white space in the middle of the wing, deep sooty black: bill black: inside of the mouth, and legs, bright red. (Young of the year). Crown of the head and nape blackish, the feathers edged with white; lower part of the neck, and sides of the breast, gray and white mixed: throat, breast, and rest of the under parts, white: upper back and scapulars black, many of the feathers edged with white; lower back black; rump white mixed with black: wings as in the adult, but the white speculum marked with cinereous and dusky spots: irides dusky brown: inside of the mouth, and legs, reddish. (Egg). White, tinged with green; blotched, spotted and speckled, with ash-gray, red brown, and very dark brown: long. diam. two inches three lines; trans, diam. one inch six lines.
Met with principally in the northern parts of the kingdom. Common in the Hebrides and Orkney Islands, where they remain all the year, breeding in the crevices of rocks. Like the last species, lays but one egg*. Food, small fish, and marine Crustacea. Obs. The Spotted Guillemot of authors is this species in. its immature state.