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Show 320 Measurements of fifty- three skulls of VCLPES ALOPEX et tars. ft 9481 8039 8037 8417 « 037 6039 6040 6034 6035 4300 6221 6038 7175 6821 7179 6864 1485 6862 7186 1484 6825 1492 6263 1519 6859 6258 1518 11573 11897 11296 11218 7855 12909 1325 2014 4191 3078 3073 3067 3719 3695 3698 3709 3716 3701 3715 3074 3075 1038 790 868 869 870 Locality. Kinai, Alaska Kodiiilr, Al* 4lr* Aleutian Islands Yukon River do do do .-. do FortLiard Peel River do Fort Good Hope do do Fqrf Anderson do do do do do do do do do do do J do do FortBerthold Fort Dalles, Oreg • FortCrook, Cal do do do do do do do do do do do .^!.. do. I:::::::::::::::::::::::::;:::::::::::;;::: do f d d d d % d d d d Length. 6.20 6.20 5.90 6.15 a is aoo 5.70 5.80 5.70 5.95 5.87 & S5 aoo 5.90 a 75 a io aoo 5.95 5.80 a 75 a 75 a 75 5.66 5.65 5.60 a 55 5.55 aoo aoo a 82 a no 5.90 5.65 a77 a TO a 40 a 65 a 68 5.60 a so a so a 30 a 30 5.37 5.87 5.85 5.25 5.4 » a 70 a 65 a 62 5.62 a so Width. 3.03 a 32 aoo 3.25 aoo a is a 05 aoo 8.90 a 14 3.10 8.88 aoo a 07 8.94 a 28 a 25 aoo 2.90 2.95 aoo a io 8> 87 aoo aoo 8L90 a 20 aoo 2.78 3.03 a 85 8.85 2.83 2.70 2.87 2.65 2.85 2.95 2.87 2.70 2.70 2.75 2.80 2.75 8.73 8.78 a io 3.04 a is a 05 ! a 07 1 Remark*. Silver. Do. Do. Do Silver. Silver. Do. Silver. Black. Silver. Do. Silver. Do. Do. Silver. Do. Fnlvons. " Macrurut." Do. Do. Do. Do. Do. Do. Do. Do. • UROOTON VIRGOIANUS. Measurements of a series of fifteen skulls of this species ( all of the available material) form a series grading by slight differences in length from 3.73, the smallest, to 4.77, the largest. The largest specimens are from Pennsylvania, Washington, aud Virginia; all these exceed 4.60 in length. The next in size are from Southern Texas and Southern California, which range in length from 4.63 down to 4.50. Next come three specimens from Tehuantepec, Southern Mexico, which, range from 4.40 to 4.15. Between these and the next- a series of three " Utfaratii* skulls from the islands off Southern California- is an interval of three-tenths of an inch, the three " littoralis » skulls ranging from 3.85 to 3.75. The smallest of all, however, is a single well- matured skull from Merida, Yucatan, 3.73 in length, and hence smaller even than the smallest " littoralis " skull, its breadth being only 1.98 against a breadth of 2.05 in the narrowest " littoralis" specimen. Tlje localities represented |