[14] Bird Records from Great Slave Lake Region. By E. T. Seton. The Auk, 1908, p. 72.
[15] Biological Investigation of Hudson Bay Region. By E. A. Preble. N. A. Fauna No. 22. Washington, 1901.
[16] Proc. Acad. Nat. Sci. Philadelphia, Vol. XIX, 1867, p. 49.
[17] My thanks are due to the following friends who made it possible for me to study crow skins from parts of the State not covered by my own collection; L. A. Adams, A. H. Felger, J. D. Figgins, F. C. Lincoln, E. R. Warren, Witmer Stone, and to my various friends for permitting me to quote them in the body of this paper.
[18] Nichols, J. T., American Naturalist. September, 1916; pp. 565-574.
[19] Nichols, J. T., Auk. Jan. 1912; pp. 44-48.
[20] Taylor, Walter P. Univ. of Cal. pub. Zoölogy, Vol. 12, no. 15, March, 1916.
[21] Riverside Nat. Hist., Vol. IV, pp. 8, 9.
[22] Cf. Faxon, Mem. Mus. Comp. Zool., Vol. XL, 1911., pp. 57-78.
[23] Cf. Proc. Calif. Acad. Sci., 4th Ser., Vol. II, Pt. II, 1918, p. 88.