OCT., 1900.] BIRDS OF THE YUKON REGION. 59 



15. Larus barrovianus. Point Barrow Gull. 



Abundant on the LoWer Yukon, at the Aphoon mouth, and durinj^ 

 September at St. Michael, though most of the adults had gone by the 

 middle of the month. While crossing Bering Sea we saw several 

 young October 2 and others near Unalaska October 4. A young 

 bird shot near St. Michael September 19 had the head of a recent!}^ 

 killed ptarmigan in its throat. The irides of the 3'oung are Prout's 

 brown; tip of l)ill and sides of nails black; rest of bill, toes, and pal- 

 mations vinaceous buff; rest of nails drab gray. 



IG. Larus glaucescens. Glaucous-winged Gull. 



Large gulls, which doubtless were chieii}" this species, were common 

 from Dixon Entrance to Lynn Canal May 28-30, and we saw a few 

 near Skagway June 1-2. At Unalaska, where I collected two, the}' 

 were a])undant October 4^6. A few gulls that followed the Oori/nn 

 in the North Pacific I think also T)clonged to this species. 



17. Larus argentatus smithsonianus. American Herring Gull. 



The only large gulls I took on the Yukon — a female which had fin- 

 ished laying, collected at Lake Tagish June 30, and another taken near 

 Charlie Creek August 8 — were this species, and no others came close 

 enough to make identification positive; hence I must refer all the large 

 gulls seen to Larus a. smitlisonicmus^ although on several we could see 

 no black on the primaries. I saw one flying over White Pass Summit 

 June 12 and another at Bennett City June 19. We saw eight or ten 

 at Cari])ou Crossing and a few on Lake Tagish. No more were 

 observed until we reached Lake Lebarge Jvlj 13; but from this point 

 to the mouth of the river large gulls slowly became more numerous, 

 one or two being noted every few daj's. Three fully grown 3"oung, 

 with their parents, were seen on a sand bar about 1.5 miles a])o^'e 

 Circle August 12. 



18. Larus brachyrhynchus. Short-billed Gull. 



Our acquaintance with this bird dates from our arrival at Lake 

 Marsh, July 1, where we found it common, and took downy young 

 the next day. From this time, until we reached the Tatchun River, 

 July 23, hardly a daj^ passed that we did not see several; on July 20 

 we counted fourteen on a sand bar near Little Salmon River. After 

 July 23 we saw no more until September 6, when young of the year 

 appeared at St. Michael, and were common there until the 23d. The 

 only adult seen at St. Michael was noted on September 11. 



The adult has the irides Prout's brown; ring on eyelids and skin at 

 commissural angle reddish orange; gape orange; bill, tarsi, and toes 

 olive yellow; nails black, french gray at base. 



Natal plumage: Creamy white, becoming pale cream color on fore- 

 head, chin, and anterior breast, mottled with different shades of brown, 



