This species has a dentition very similar to the Salmo Amethystus, but not quite so robust. The upper and lower maxillaries and intermaxillaries, and each of the palatines, have a row of teeth. The vomer one and the tongue two rows, beside the acute teeth. The tail is less furcate, and the dorsal fin is larger than in the Mackinaw Salmon. The flesh is rich and of fine flavor, but almost too fat.

The fin rays are:—D. 12, P. 14, A. 12, 14, V. 9, C. 30.

This fish is shorter and stouter, and not so distinctly spotted as the Mackinaw Salmon; it is altogether less handsome, but has similar habits, and bites readily at the trolling spoon. It was first described by Professor Agassiz, not many years ago, during his tour of Lake Superior, but has always been distinguished by the Indians and Voyageurs, and known among them under its distinctive appellation.

The Siskawitz inhabits the upper portion of Lake Superior, and never descends towards the outlet, and is taken in the neighborhood of Isle Royale in abundance. It is said also to be found in some of our other lakes, but is very rare.