ORNITHOLOGICAL EXPLORATIONS. 



291 



of tertials (except first), pure white, appearing as a continuous, unbroken , elongated 

 patch on the closed wing ; inner webs of tertials, blackish ; secondaries, grayish brown, 

 the outer webs edged with white, but inner webs with no trace of white edging toward 

 ends; primaries and their coverts, with alulae, also grayish brown (or brownish gray) 

 edged with white. Bill, uniform deep black. Feet duller black. Iris dark brown. 



Adult 9 .— U. S. JSfat Mus. iS'b. 88987 ; L. Stejneger No. 2031. Bering Island, May 11, 1882. 

 Similar to the adult ^ as described above, but nape, back, and scapulars, uniform 

 plumbeous gray, instead of black ; chin black. 



Specimens in autumnal plumage. — <?. — U. S. Nat. Mus. No. 92689; L. Stejneger No. 2597. 

 retropaulsTci, September 18, 1883. 



Iris dark brown. Bill black, yellowish gray on basal half of lower mandible. 

 Feet black. 



Dilfers from the male in summer plumage in having the posterior half of the head 

 and the back giay, the former with a slight yellowish wash and mottled with black ; 

 the white parts on the head are also suffused slightly with yellowish ; the mentum is 

 white, and the black feathers of the throat narrowly edged with whitish. Remiges 

 and rectrices edged more conspicuously with white. 



The female (U. S. Nat. Mus. No. 92690) killed on Staritskof Island, at the entrance 

 of Avatscha Bay, Kamtschatka, September 23, 1883, by L. Stejneger, is similar, but has 

 the yellowish tinge extended over the back, throat, and inner wing-feathers. The 

 black on the throat is still more restricted. 



List of specimens collected. 

 A.— DURING THE MONTHS OF MAT AND JUNE. 



89146 

 92682 

 92683 

 92684 

 92685 



92686 

 92687 

 92688 

 92681 



Stejueger. 



....do 



....do 



....do 



....do 



....do 



....do 



....do 



....do 



....do 



...do 



...do 



1034 

 1010 

 1238 

 2010 

 2030 

 2036 

 2037 

 1035 

 2032 

 2031 

 2058 

 2105 



Locality. 



Bering Island , 



do 



Petropaulski . . 

 Bering Island . 

 Petropaulski . 



do 



do 



Bering Island . 

 Petropaulski . . 



do 



do 



, do 



May 

 May 

 June 

 May 

 May 

 May 

 May 

 May 

 May 

 May 

 May 

 May 



11. 1882 



9. 1882 

 27, 1882 



5. 1883 



15. 1883 

 17, 1883 

 17, 1883 



11. 1882 



15. 1883 

 15, 1883 

 24, 1883 

 22, 1883 



c?ad. 

 cfad. 

 cfad. 

 cfad. 

 cfad. 

 cfad. 

 cfad. 

 ?ad. 

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 $ad. 

 ?ad. 

 ?ad. 



Average measurements of 7 males . . 

 Average measurements of 4 females 



mm. 

 203 

 196 

 207 

 202 

 208 



215 

 189 

 195 

 192 

 198 

 (200) 



205 

 193 



m,m,. mm,. 

 94 

 95 

 91 

 94 

 95 

 97 

 97 

 89 



70 



63 



95 



91 

 90 

 97 

 97 

 97 

 101 

 92 

 91 

 88 

 86 

 94 



B.— DURING THE MONTH OF SEPTEMBER. 



2597 Petropaulski 



Staritskof Island, Kam- 

 2641 tschatka 



Sept. 18, 1883 

 Sept. 23, 1883 



cfad. 



