AVES NATATORES. [URIA. 



GEN. 102. URIA, Sriss. 



272. U. Troile, Lath. (Foolish Guillemot.) Above 

 brownish black; secondaries tipped with white: bill as 

 long as, or somewhat longer than, the head ; very much 

 compressed throughout : feet dusky. 



U. Troile, Temm. Man. d'Orn. torn. 11. p. 921. Foolish Guillemot, 

 Mont. Orn. Diet, fy Supp. Bew. Brit. Birds, vol. n. p. 166. Selb. 

 Illust. vol. ii. p. 420. pi. 79. 



DIMENS. fentire length seventeen inches nine lines: length of the 

 bill (from the forehead) one inch eleven lines, (from the gape) two inches 

 eleven lines ; of the tarsus one inch seven lines ; of the tail two inches ; 

 from the carpus to the end of the wing six inches two lines : breadth, 

 wings extended, two feet. 



DESCRIPT. (Adult in winter.) Forehead, crown, space between the 

 eye and the bill, a longitudinal streak running backwards from the eyes 

 to the distance of an inch and a half, and all the upper parts, including 

 the wings, brownish black with a slight tinge of cinereous : occiput gray- 

 ish white, opening on each side into a white patch above the longitudinal 

 streak behind the eyes: secondaries tipped with white: all the under 

 plumage pure white ; the black on the sides of the neck advancing in 

 front towards the lower part, and forming a faint collar of grayish ash : 

 bill black ; very much compressed throughout its whole length : inside of 

 the mouth dull yellow : irides brown : feet and toes yellowish brown ; 

 posterior part of the tarsus and membranes black. (Summer plumage.) 

 The whole of the head, including the region of the eyes, throat, and all 

 the upper part of the neck, pitchy brown : inside of the mouth bright 

 yellow: the rest as in winter. (Young of the year.) Resemble the adult 

 in winter, but distinguished by the shorter bill : the longitudinal streak 

 behind the eyes is also indistinct ; and the white on the under parts less 

 pure, with more of cinereous brown on the lower part of the neck : tarsi 

 and toes dull yellowish; membranes brown. (Egg.) Very variable in 

 colour, scarcely two being found precisely alike ; generally bluish green, 

 more or less blotched and streaked with black : long. diam. three inches 

 two lines; trans, diam. one inch eleven lines. 



Met with in great abundance on various parts of the British coast 

 throughout the year. Breeds on cliffs and rocky islands, generally in 

 large companies. Lays a single egg. Food, fish, marine insects, and 

 small bivalve mollusca. Obs. The Lesser Guillemot of English authors 

 is the young of the year of this species. 



(23.) U. Brunnichii, Sab. in Linn. Trans, vol. XH. p. 538. Temm. 

 Man. d'Orn. torn. n. p. 924. Franks Guillemot, Shaw, Gen. 

 Zool. vol. xii. p. 243. pi. 62. 



According to the statement of a writer in the Quarterly Review, 

 (vol. XLVII. p. 354. ) this species has been killed off one of the Shetland 

 Isles. It is distinguished from the last, principally by the form of the bill, 

 which is shorter and more dilated at the base. 



273. U. Grylle, Lath. (Black Guillemot.) Above 

 black; a large white patch on the middle of the wings: 

 legs red. 



