114 CRUISE OF STEAMER OORWIN IN THE ARCTIC OCEAN. 
PODICIPID®. GREBES. 
PODICEPS POLBOLLI Reinh, 
(171.) AMERICAN RED-NECKED GREBE. 
These Grebes are quite numerous, occurring along the entire American coast of Bering Sea, 
and breeding from the Peninsula of Aliaska to the vicinity of the Straits. They are most 
numerous, however, in autumn, when they are found frequenting the sea; and some years from 
ten to a dozen specimens may be secured, while in others but one or two will be seen. It is 
unknown from the islands and the Asiatic shore of this sea, and the only portion of the Arctic 
coast of which I have proof of its occurrence is in Kotzebue Sound, where it also nests in summer. 
DYTESAURITUS (Linn.) Ridgw. 
(172.) HORNED GREBE. 
Like the preceding, this bird is found all along the mainland shore of this sea, where, however, 
it breeds very sparingly, being mainly an inland species. It is found quite frequently in the 
interior, where it nests and visits the sea-coast during the autumnal migration. It is also found 
on the shore of Kotzebue Sound, but is not known from the islands of this sea nor the Asiatic coast. 
COLYMBIDA. LOONS. 
COLYMBUS TORQUATUS Brinn. 
(173.) THe Loon. 
This bird is found along the Bering Sea coast, on both sides, and also upon the shore of the 
Arctic, breeding wherever found. It is not abundant in this region, neither is it rare. There is 
no record of its occurrence upon any of the islands of this sea, although, as noted, it occurs on 
both shores. 
COLYMBUS ADAMSI Gray. 
(174.) GREAT WHITE-BILLED LOON. 
This bird, the largest of the Loons, has « cireumpolar distribution, although it is not known 
to ocenr in abundance at any locality. It is found breeding about Kotzebue Sound, whence the 
natives brought me several specimens, and reported the bird to be rather common there in summer. 
I secured a young bird at Saint Michael’s in autumn, and it is known to occur on the Asiatic 
shore. There is no record of its presence about the Bering Sea Islands, but, like the other species 
of Loons, it undoubtedly visits these islands, during the migrations at least. The difficulty of 
studying the birds which frequent the sea about these storm-beaten islands is apparent, and 
accounts for the little progress which can be made in determining the full number of species 
which are found in their vicinity. 
COLYMBUS ARCTICUS Linn. 
(175.) BLACK-THROATED LOON. 
This bird is found everywhere along the shore of Bering Sea on the American coast, and is 
very abundant, nesting along the shore from the Peninsula of Aliaska north to Kotzebue Sound. 
It was also seen in Bering Strait the first of July, and noted on several occasions along the 
Asiatic shore, where it also breeds. It has not been recorded trom the islands of this sea, although 
undoubtedly occurring there in the migrations. 
COLYMBUS PACIFICUS Lawr. 
(176.) PactFIc DIVER. 
This bird is very rare on the coast of Bering Sea. Among the large number of Black-throated 
Loons secured by me, only one proves to belong to this bird, and the same proportion is found to 
hold good with other collections which have been brought from that country. This specimen was 
