226 LONG-WINGED SWIMMERS — LONGIPENNES. 



other, with a minute spot on each side, opposite the space between the two larger spots ; occiput 

 with four large spots arranged in a transverse series ; below these, three others, thtir position 



corresponding to the spaces between the spots 

 of the series above ; below these three spots a 

 ragged land across each side of the nape, the 

 two separated by a considerable interval ; then 

 follow two or three spots across the lower part 

 of the nape, their iunu and arrangement being 

 rather indefinite. On the hnes are three small 

 spots arranged longitudinally ; a spot over each 

 eye ; there are also several irregular large spots 

 on the lower part of the head, rather less dis- 

 tinctly defined than the others. Total length, about 10.00 inches ; bill (from culmen), 1.00 

 inch.i 



Total length, about 30.00 inches ; wing, 17.60-19.50 (average, 18.48); culmen, 2.40-2.60 (2.49); 

 depth of bill through angle, .98-1.05 (1.01); tarsus, 2.70-3.10 (2.83); middle toe, 2.10-2.50 (2.34). 

 (Five adults.) 



The Great Black-backed Gull — or Saddle-back, as it is more commonly called 

 on the American coast — is a North Atlantic species, common to both the European 

 and the ximerican coasts, and found as far north as the Arctic Circle. It also occurs 

 in the Pacific, as Mr. Swinhoe met with it in Japan in JNIay ('' Ibis," 1874). It is 

 found along the entire coast of Europe and North Africa, from Norway to Madeira ; 

 and it breeds from the northern coast of France and Great Britain northward." 



The Messrs. Godman found this species breeding in large numbers on all the 

 islands off the coast of Norway ; and Mr. Wheelwright also affirms that it breeds 

 along the coast of Scandinavia as far as North Cape ; but states that in the south- 

 ern portion of that country it is more common on the I>altic shore than along the 

 Cattegat and the North Sea. It also breeds sparingly on Lake Wener. 



Mr. Godman, in his paper on the Birds of Madeira and the Canary Islands 

 (" Ibis," 1871), states that several birds of this species followed his vessel from Lis- 

 bon until they were nearly in sight of the Canaries, although he did not afterward 

 nu'et Avith any in that group of islands. He w^as informed, however, that these birds 

 breed on the Island of Alegranza. Mr. Saunders found them not uncommon, in their 

 immature plumage, on the coast of Spain ; adults Avere comparatively rare. 



According to Yarrell, this species is found throughout the year on various parts 

 of the British coast. It does not, however, generally occur in large numbers, and is 

 most frequently seen in pairs. It remains all the year on the flat shores at the mouth 

 of the Thames, where it is a marsh-breeder ; both nuile and female birds assisting in 

 building their grassy nests, and driving other birds away. 



According to Thompson, it is a resident species in Ireland. It is found in Wales 

 in abundance on the extensive sandy flats of the coast ; and it also breeds in Scot- 

 land in considerable numbers on Bass Eock, in the Firth of Forth, and in the firths 

 of Sunderlandshire. 



According to Mr. Hewitson, this Gull breeds in abundance on some of the islands of 

 the Orkney and Shetland groups. There it selects Avith care a place surrounded by 



^ Described from No. 84765, from Labradoi'. It may be remarked with regard to the markings of the 

 head, that while in the main those of the two sides correspond in position, .some of them are asj-mniet- 

 rical ; thus, the left lore has the three spots near togetlier and roundisli in form, the middle one above 

 the otliers ; the other lor(! has these spots nuiuh farther apart, in a Hne with one another, tlie middle one 

 much e]ongate<l ; there is but one spot over the riglit eye, two over the left. 



2 The bird found in the North I'acific is the closely allied L. scliistisagus, recently described by Dr. 

 Stejneger. — .J. A. A. 



