IJEWTON ON BIRDS IN GREENLAND. 107 



Greenland, and said to be as numerous in the Polar Sea as it is in 

 Davis Strait. 



36. Larus marinus. Great Black-backed Gull. " Nayardluk," 



" Nayardlurksoak." 

 Breeds generally throughout Danish Greenland, but most com- 

 monly between lat. 63° and lat. 68°. As large as the preceding 

 species, or larger, but easily distinguished therefrom by its black 

 back and primaries. 



{^6.) Stercorarius catarrhactes. Great Skua. 

 Seen twice on the south coast by Holboll. 



37. Stercorarius pomatorhinus. Pomatorhine Skua. 



Said to be the commonest species of Skua in the north. Breeds 

 in societies from Bjornenses, north of Egedesminde, to the north- 

 ward. Several were killed in Regent Inlet, and it was also seen on 

 the Parry Islands, but more rarely than the next species. Authen- 

 ticated eggs of this bird are rare in collections. It is easily dis- 

 tinguished in flight by the peculiar formation of the two middle tail- 

 feathers, which are twisted near the tip, so as to take a vertical 

 direction, and give the appearance of a disc or ball attached to the 

 bird's tail. 



38. Stercorarius parasiticus. Common Skua. " Isingak," 



" Meriarsairsok." 

 Breeds in both Inspectorates, but most commonly in the 

 Southern. Found on the East Coast by Graah, but not by the 

 German Expedition. Obtained also on the west coast of Davis 

 Strait. Equally abundant in the Polar Sea as in the latter. To be 

 distinguished from the preceding species by its smaller size and 

 perfectly straight tail. This and the next species appear to be 

 " dimorphic," a wholecoloured * and a particoloured bird being 

 often found paired, and the difference in plumage seems to be 

 irrespective of sex or age ; but on this point further information 

 is desired. 



39. Stercorarius longicaudatus. Buffon's Skua. 



Said not to breed further south than lat. 70° N. One example 

 obtained by the Germans. To be distinguished from the last 

 species by its smaller size, more slender bill, and, even on the 

 wing, by its exceedingly long tail. Would seem to be rather less 

 " dimorphic " than S. parasiticus. 



40. Procellaria glacialis. Fulmar or Mallemoke. " Kakor- 



dluk," " Kakordluvek ;" dark variety, " Igarsok." 

 Said not to breed further to the south than lat. 69° N. Occurs 

 also in East Greenland (Pansch). A very unmistakeable bird, 

 but worthy of attention since individuals vary a good deal in the 



* It is to this wholecoloured form that the name S. richardsoni properly 

 applies. 



