614 



both mandibles at base 1-7-1 'To, wing 7*5-7'9, tail 2-5-2-65, 

 tarsus 1'3-1-155, middle toe and claw 2-2. 



Adult in non-breeding plumage. Differs from the above in lacking 

 the long superciliarj' tufts ; the white feathers on the fore part of 

 the face replaced by blackish-grey, and the horny covering of the 

 basal part of the bill absent. " Basal part of the biU dark brown ; 

 ring round the eye and feet pale salmon-red '' {L. Stejneger). 



Immature. Similar to the adult in non-breeding plumage, but 

 easily distinguished by having the breast and rest of the underparts 

 largely mixed with whitish, only the tips of the feathers being 

 smoky-grey. 



In still younger examples the grey tips to the feathers of the 

 chest and belly are less developed, and the underparts have a whiter 

 appearance. 



still partially clad in down. Breast and belly pure 



2^estling 

 white. 



Young in 

 underparts. 



Bah. The same as that of the genus. 



dmun. Deep smoky-black, somewhat paler on the 



a. Pull. sk. 

 b-d. S 2 ad. sk. 

 e. Ad. sk. 

 /. 2 ad. sk. 



ff. 5 ad. sk. 



h-7n. J $ ad. sk. 



n-^. Ad. et pull. 



sk. 

 q. Ad. sk. 



r. Ad. sk. 

 s. Imm. sk. 



t. cJ ad. sk. 



u. Juv. sk. 



v-z. S 2 ad., juv. 



et pull. sk. 

 a',b'. (S 2 ad.sk. 



E. coast of Siberia, July. 

 Kurile Islands, July (O. Snow). 

 Kairiscliatka,summer(0. Snow). 

 Kamschatka, June 23 (Dr. 



Schrenck). 

 Petropaulowsk, Kamschatka, 



autumn. 

 Bering I., Commander Group, 



June, July. 

 Copper I., Commander Group, 



Aug. 5. 

 Bering Straits. 



Bering Straits. 

 Bering Straits. 



Sagmatorr 

 St. Paul I., Pribvloff Group, 



July 7-10 (H. W. Elliott). 

 Ala.«ka [E. W. Nelson). 

 St. Michael's, Alaska, Jime, 



Sept.-Oct. (E. W. N.). 

 Stewart I., Alaska, June, Aug. 



(E. W. N.). 



Purchased. 

 Seebohm Coll. 

 Seebohm Coll. 

 Seebohm Coll. 



G. E. H. Barrett- 



Hamilton,E8q.[P.]. 

 G. E. H. Banett- 



Hamilton,Esq.[P.]. 

 G. E. H. Barrett- 



Hamilton,Esq.[P.]. 

 Capt.Kellett& Lieut. 



Wood, R.N. [P.]. 

 Purchased. 

 Purchased. (Type of 

 hina lathami, Bonap.) 

 Salvin-Godman Coll. 



Sah-in-Godman Coll. 

 Salvin-Godman Coll. 



Salvin-Godman Coll, 



* This was correetly described by Dybowski, but according to Dr. Stejneger 

 the colour of the underparts is not pure white, though in some individuals it is 

 quite light ; the latter author is, moreover, of opinion that the grey-tipped 

 feathers of more adult birds are not produced by a fresh moult. I find, how- 

 ever, that in a full-grown young bird (type of 5. latJunni) there are a number 

 of partially grown breast-feathers ; these, unlike those of the adult, are all white 

 •with grey tips, and similar to those covering the rest of its underparts ; and 

 it may be that after all Dybowski is right, and that a moult takes place 

 between these two phases. 



