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Show 328 Measurements of thirty- seven skulls O/ PUTORIUS VISON. II 55 6130 8709 8797 8796 8707 8703 8702 8791* 8648 8708 6531 8704 8706 8705 3284 43J9 813- 4 4305 139ft 3730 3834 1169 3085 3084 3823 3823 3242 3243 3341 3244 3250 2267 1647 4834 4835 1894 11315 Locality. Fort Yakon, Alaska A!**** T do do do do do do Alaska ( Kadiak) Alaska do do do do FortSimDBon . dr..!....:::.::;;:::.::::.;::.::: do Fort Randall do do ; do do do do do do do do Pennsylvania . . . . . . do do Brookhaven, Miss Sex. 1 <? * e e 9 1 Length. 3.03 9.83 3.83 3.75 2.73 2.7* 3.60 3.64 3.63 3.68 3.55 3.45 3.33 3.30 8.86 3.70 3.90 3.55 3.90 3.60 3.60 3.40 3.40 3.40 3.33 1 3.30 3.47 3.40 2.35 3.30 3.40 3.17 3.50 2.50 2.47 3.80 2.60 Width. LOO 1.64 1.63 1.61 1.63 1.57 1.63 1.55 1.53 1.56 1.50 1.45 1.40 1.40 1.62 1.51 1.78 1.46 1.61 1.48 1.38 1.32 1.38 1.31 1.32 1.23 . 1.37 1.30 1.31 1.18 1.48 1.30 1.48 1.48 1.48 1.61 1.50 Remarks. Very old. Da Da Do. Da Do. Do. Do. Da Da Do. Do. Da Do. Do. Da Do. Da Old. Da Old. P." nigrescent' Da Do. Old. Da Da Do. Da Da Da Do. Do. Do. Do. Da Da A & B. MUSTELA AMEBICANA. The forty- six male skulls of this species, of which measurements are given below, are mainly from four or five localities differing widely in latitude. A comparison of the average size of a considerable number from each shows a well- marked decrease in size southward. Four skulls from Peel Ei ver, the largest, and also from the most northerly locality, have an average length of 3.39, and an average width of 2.07, the extremes being 3.50 and 3.35 in length and 2.12 and 2.02 in width. Nine skulls from the Yukon ( probably mostly from near Fort Yukon) give an average length of 3.34 and an average width of 1.98, the extremes being 3.55 and 3.00 in length and 2.15 and 1.73 in width. Five skulls from Fort Good Hope give an average length of 3.24 and an average width of 1.95, the extremes in length being 3.37 and 3.15 and in width 2.05 and 1.73. Ten skulls from the northern shore of Lake Superior average 3.14 in length and 1.76 in width, the extremes in length being 2.23 and 3.02 and in width 1.89 and 165. Eight skulls from the vicinity of Umbagog Lake, Maine ( Coll. Mas. Comp. Zool.), average 2.96 in length and 1.72 in width, the extremes in length being 3.10 and 2.73, and in width 1.85 and 1.50. Five skulls from Northeastern New York average 3.02 in length and 1.61 in width, the extremes being in length 3.10 and 2.92 and in width 1.68 and 1.50. There is thus a gradual descent in the average length from 3.39 to 3.02. and in width from 2.07 to 1.61. The largest and the smallest of the series are respectively 3.55 and 2.92 in length. Several fall as low as 3.00, and an equal number attain 3.50. The difference between the |