ALASKA. 211 



035. L.oiii\'i:i ari'n, (PArL.) Coves.— Thid-hllled duiUmot. "Arrie." 

 ('il>l>hiis and, I'ALL. Zoovr. R.-A., ii, 347, (l-^U.) 

 Uria ana, Cass. I'roc. Thila. Acad., 3*24, (l^C)\i.) 



(Also, Urla hriinulchii, tfcc, of authors referring to tbe North Pacitic 

 thick-billed bird.) 



It is an iutcrestiug fact that these specimens, unquestionably 

 of the "thick-billed" guillemot, do not exhibit the extreme 

 shortness and stoutness of bill shown by those of the North 

 Atlantic, the bill being almost exactly- intermediate. AVith the 

 chord of culmen about I5 inches long, the depth of the bill 

 opposite the nostrils is hardly, or not, 3 of an inch, and thus 

 much less than half as long, instead of about half as long. 

 The gape is about 3 inches. While the bill shows the dilated 

 and denuded basal portion of the maxillary tomium, character- 

 istic of the species, this raised, naked border is not yellowish, 

 but of a peculiar glaucous bluish-gray color. The tip of the 

 bill is less hooked than in true ''•hrihimclili,''^ though more so 

 than in troile. The modification of the bill appears somewhat 

 singularly analogous to that which takes place in var. cali/or- 

 nica as compared with true troile. 



This bird is,- of course, the true arra of Pallas, (a name ap- 

 parently derived from the Eussian vernacular,) whatever be its 

 relationshii) to the Atlantic bird. We should not be surprised 

 if some of the circumpolar forms were to connect the exti;emes 

 of brilnnichii and troile by insensible gradations. 



"The great egg-bird of the North Pacific, frequenting these 

 islands by millions. This Uria and one other, the var. cali/or- 

 nicaj are the only birds of the genus found here, but the latter 

 is in comparatively no number whatever, not one being seen 

 where a thousand of the former are visible at once. 



" They appear very early in the season, but do not begin to 

 lay until the 18th or 25th of June, and the natives tell me that 

 in open, mild winters these birds are seen in straggling flocks 

 all around the islands. I feel quite well assured that all the 

 individuals do not migrate from this sea and the vicinity of the 

 Aleutian Islands. 



" They lay their eggs upon the points and narrow shelves on 

 the faces of the cliti- fronts to the islands, standing over the 

 eggs, side by side, as thickly as they can crowd, making no 

 nests. They quarrel desperately, and so earnestly, that all along 

 under the high bluffs on the north shore of Saint George's hun- 

 dreds of dead birds are lying, having fallen and dashed them- 



