The Yakutat Bear, (_Ursus dalli_).—In 1899, we received from Hudson Lake, Copper River District, Alaska, two young Alaskan Brown Bears which for some time we believed would prove to represent the species found on Kadiak Island. In this belief they were for a time labeled as Kadiak Bears, (_U. middendorffi_), and so entered provisionally in previous editions of the Guide Book. The maturity of the animals has proven that this supposition was erroneous. The extremely short and thick muzzle of the adult male proves conclusively that they are not identical with the long-skulled species of Kadiak. This interesting pair, absolutely identical in color with _middendorffi_, are now identified, pending further revisions of our _Urisdae_, as _Ursus dalli_. [Illustration: SYRIAN BEAR.] This species, and the two following, well represent the group of big Alaskan Brown Bears, which are quite distinct from the grizzlies and blacks. They are characterized by their great size, high shoulders, massive heads, shaggy brown pelage, and large claws. They live chiefly upon salmon, which they catch from the small streams, but they also devour great quantities of _grass_. The Peninsula Bear, (_Ursus gyas_), of Moeller Bay, well down the Alaskan Peninsula, may at once be recognized by its light brownish-yellow color, and its great size for a bear born in 1904. Its claws are of enormous thickness. This animal is now beyond doubt one of the two largest bears in captivity, his only rival being in the Zoological Park at Washington. The Admiralty Bear, (_Ursus eulophus_), represents a large species originally discovered on Admiralty Island, southern Alaska. Its dark brown color is very much like that of the Yakutat and Kadiak bears. The Grizzly Bear, or “Silver-Tip Grizzly,” (_Ursus horribilis_).—The rapid disappearance of this species from the United States renders all living examples of it specially interesting. Of all bears, the Silver-Tip Grizzly is the most savage and dangerous. He is easily angered, and when wounded or harried not only becomes furiously vindictive, but he also possesses a degree of courage which renders him a dangerous antagonist. As a general thing, a Grizzly Bear, like a lion or tiger, will run as soon as he discovers the presence of his only enemy—man; but if he is wounded or cornered—or _thinks_ he is cornered—he assumes the aggressive, without an instant’s delay. Unfortunately, the largest Silver-Tip Grizzlies ever killed have been too far from scales to make it possible to weigh them. The most interesting specimen of the Rocky Mountain Silver-Tip now on exhibition is a dark-colored and very handsome specimen, named “Engineer,” obtained in Meeker, Colorado, by Professor Henry F. Osborn, and presented to the Society by the Engineers’ Club of New York City. The color of this individual is darker than the most common type of the Silver-Tip, which is sometimes almost as gray as a badger.