Specimens examined.—Total, 56, distributed as follows:
Alaska: Cook Inlet, Tyonek, 1 (USBS); head Chalitna River, 2 (USBS); Lake Clark, 4 (USBS); east side Chilkat River, 100 ft., 9 mi. W and 4 mi. N Haines, 8; Yakutat, 3 (USBS); Lake Iliamma, 1 (USBS); Lake Aleknagik, 1 (USBS); Kokwok, 1 (USBS); Nushagak River, 3 (USBS); Chilkat Peninsula, 10 ft., 7 mi. SSE Haines, 18; Nushagak, 3 (USBS); Chignik Bay, 1 (USBS); Portage Cove, Revillagigedo, 1 (MVZ); Izembek Bay, 1 (USBS); Frosty Peak, 1 (USBS).
British Columbia: west end Kelsall Lake, 2900 ft., 1; Stonehouse Creek, 51/2 mi. W junction Stonehouse Creek and Kelsall River, 4.
Yukon: SW end Dezadeash Lake, 2400 ft., 2.
Marginal records.—Alaska: Lake Aleknagik; head Chalitna River. Yukon: SW end Dezadeash Lake, 2400 ft. Alaska: E side Chilkat River, 100 ft., 9 mi. W and 4 mi. N Haines; Portage Cove, Revillagigedo Island; Yakutat; Cook Inlet, Tyonek; Chignik Bay; Frosty Peak.
Zapus hudsonius americanus (Barton)
Dipus americanus Barton, Trans. Amer. Philos. Soc., 4:115, 1799.
Jaculus americanus Wagler, Nat. Syst. Amphibien, 23, 1830.
Meriones microcephalus Harlan, Proc. Zool. Soc. London, p. 1, 1839, based on two specimens from "the farm of Mr. Beck, in Philadelphia County, a few miles northeast of the city [= Philadelphia, Pennsylvania]."
Jaculus hudsonius, Baird, Repts. Expl. and Surv. 111, 8 (pt. 1): 433, July 14, 1858 (part—the part from Massachusetts, Connecticut, New York, New Jersey, and Pennsylvania).