ALCIDyE — THE AUKS — URIA. 483 



Examples of tliis species obtained by Dr. Bryant on Gannet Hock, in the Gulf of 

 St. Lawrence, have a ground of cream-color, and the markings arc black. They 

 measure 3.25 inches in length, and from 2.00 to 2.05 in breadth. 



Uria troile californica. 



THE CALIFORNIAN GUILLEMOT. 



Uria troile, Newb. racific R.R. Rep. VI. iv. 1857, 110 (not Cohjmhiis troile, Linn.). 



Uria Brilnnichii, Heeum. lb. X. 1859, Birds. 75 (not of Saiuxe, 1818). 



Calarractcs callfornicus, Bryant, Pr. Boston Soc. 1861, 11, figs. 3, 5 (Farallon Islands, coast of Cali- 

 fornia). 



Loiiivia californica, CouEs, Pr. Ac. Nat. Sci. Philad. 1862, 79, fig. 16. 



Lomvia troile, var. californica, Coues, Key, 1872, 346 ; Elliott's Alaska, 1875, 210. 



Lomvia troile californica, Ridgw. Pr. U. S. Xat. j\[us. Vol. 3, 1880, 212 ; Noni. N. Am. B. 1881, no. 

 763 a. — Coues, 2d Check List, 1882, no. 875. 



Had. Paciftc coast of North America, breeding from California (Faralloncs) north to the 

 Prybilof Islands, and across Aleutian chain to Kamtschatka. 



Sp. Char. Similar in colors, in all stages, to typical troile, but averaging larger in all its 

 measurements, except the length of the tarsus, which is slightly shorter ; all the outlines of tlr; 

 bill usually less curved than in troile. 



Total length, about 16.00 inches; extent, 27.00 ; wing, 7.85-8.80 (average, 8..30) ; culmen, l.GO- 

 2.05 (1.86) ; gonys, 1.15-1.40 (1.27) ; depth of bill through angle, .55-.62 (.57); tarsus, l.;3.5-I.6() 

 (1.50) ; middle toe, 1.65-1.90 (1.74).i 



The characters adduced by authors for distinguishing this race from true troile of the Xorth 

 Atlantic we find exceedingly variable, and practically entirely inconstant, the individual variation 

 in the contour of the bill being very great, as may be seen by the measurements given above. All 

 the dimensions, however, are almost constantly and decidedly larger. 



This appears to be the Pacific representative of U. troile, and is, so far as America 

 is concerned, confined to the Pacific coast, from Southern California to Alaska. ]Mr. 

 Dall states that it was obtained, with its eggs, both at Sitka and at Kadiak. He 

 afterward found it at Unalashka, in company with Slmorhynchus cristateUns, but 

 much less common than that species. In his Notes on the Birds of the Aleutian 

 Islands west of Unalashka he speaks of this species as being abundant, and a[)parently 

 a resident all through the islands. It is less common and more shy than the Ccpp/uis 

 columba, but, unlike that species, congregating in immense flocks a few miles orf shore. 

 He has never met with the columha in large flocks — never more than two or three 

 individuals together. 



Dr. Cooper, when at Monterey in May, 1862, noticed these birds u: the open bay. 

 Their presence there at that season seemed strange, and rendered it probable that 

 they were breeding in the vicinity. Dv. Cooper also remarks that the chief local- 

 ity — indeed the only one known to him — to which this species resorts during the 

 breeding-season is the Farallones. There these birds swarm, clustering like bees on 

 every ledge and slope of the ragged peaks which constitute these islands, and deposit- 

 ing their eggs on the bare rock. Each bird, if undisturbed, lays but a single egg;, 

 which it incubates in a standing position. It is able to walk tolerably well when 

 standing nearly erect. 



The abundance and the large size of the eggs of this species have made them a 

 valuable article of import to San Francisco. The Farallones, twenty-five miles from 

 the mouth of the bay of San Francisco, are admirably situated for furnishing this 



^ Averajro mcasureiuents of tliiiteiMi adults. 



