MERGULUS.] AVES NATATORKS. 259 



U. Grylle, Temm. Man. cTOrn. torn. n. p. 925. Black Guillemot, 

 Mont. Orn. Diet, fy Supp. Bew. Brit. Birds, vol. u. p. 170. 

 Sdb. Illust. vol. u. p. 426. pi. 80. 



DIMENS. Entire length thirteen inches six lines : length of the hill 

 (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. 



DESCRIPT. (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 scapu- 

 lars black, many of the feathers edged with white ; lower back black : 

 rump white mixed with black : wings as in the adult, but the white spe- 

 culum 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 Guil- 

 lemot of authors is this species in. its immature state. 



GEN. 103. MERGULUS, Ray. 



274. M. Alle, Selby. (Common Rotche.) Black; 

 breast, belly, a spot above the eyes, and tips of the 

 secondaries, white. , 



Uria Alle, Temm. Man. d'Orn. torn. u. p. 928. Little Auk, 



Orn. Diet. & Supp. Bew. Brit. Birds, vol. n. p. 408. Common 

 Rotche, Sett. lUust. vol. n. p. 430. pi. 81. 



DIMENS. Entire length eight inches ten lines: length of the bill 

 (from the forehead) seven lines, (from the gape) eleven lines; of the 

 tarsus nine lines and a half; of the tail one inch seven lines; from the 

 carpus to the end of the wing four inches nine lines. 



DESCRIPT. (Winter plumage.) Crown, region of the eyes, nape, sides 

 of the breast, and all the upper parts of the body, deep black: wings 

 pitchy brown; secondaries tipped with white; tertials broadly edged 

 with the same colour : throat, front and sides of the neck, and all the 

 under parts, pure white : sides of the head also white, variegated with 

 dusky streaks, the white passing off towards the occiput in the form of an 

 indistinct narrow band : bill black : irides dusky brown : tarsi and toes 



* A writer in London's Magazine, of Natural History, (vol. v. p. 418.) asserts that in a large 

 number of instances he has in' variably found the eggs two in number. 



R2 



