REVISION OF THE JUMPING MICE OF THE GENUS ZAPUS. 27 



Measurements. Average of 4 adults from Xeah Bay, Wash.: Total 

 length, 248; tail vertebrae, 153; hind foot, 33.5. Four specimens from 

 Lake Washington, Wash., average: Total length, 240; tail vertebra?, 

 147.5; hind foot, 34.2. Ten specimens from Lake Cushman, Wash., 

 average: Total length, 239.5; tail vertebra?, 144.5; hind foot, 32.5. 

 Sknll: Six adult skulls from five localities iu Washington, average: 

 Basilar length, 20.2; zygomatic breadth, 13; mastoid breadth, 10.9; 

 interorbital constriction, 4.3; incisor to postpalatal notch, 9.6; foramen 

 magnum to postpalatal notch, 8.8; fronto-palatal depth at middle of 

 molar series, 6.7. 



General remarks. Zapus trinotatus is one of the largest, and in early 

 summer pelage one of the most showy species in the genus. In the 

 absence of specimens from the exact type locality, specimens from Port 

 Moody, British Columbia, a few miles distant on the mainland, are 

 assumed to be typical. 1 The species is remarkably constant in char- 

 acters throughout its range, examples from near the type locality not 

 differing much from specimens from Yaquina Bay, Oregon. In the 

 Sierra Nevada of California this species is replaced by the closely 

 related subspecies alleni. In a recent paper entitled ' Preliminary 

 descriptions of Xew Eodents from the Olympic Mountains,' Mr. D. Gr. 

 Elliot has described the Zapus from that region under the name Zapus 

 imperator, but in making his comparisons he ignores Z. trinotatus, con- 

 trasting impcrator only with Z.princeps. Through the courtesy of the 

 author I have been able to examine the type and a topotype of imper- 

 ator. They do not differ sufficiently from Z. trinotatus, from the con- 

 tiguous coast region and from the type locality, to admit of even sub- 

 specific separation. 



Specimens examined. Total number, 99, from the following localities: 



British Columbia: Luln Island (type locality), 2; Mount Baker Range, 4; 



Mount Lehman, 1 ; Port Moody, 3 ; Sumas, 3. 

 California: Crescent City, 1; Mad River (Carson's Camp), 1. 

 Oregon: Astoria,!; Beaverton, 3; Elk Head, 1; Giendale, 1; Lincoln County, 



1; Marshfield, 1; Salem, 1; Yaquina Bay, 9. 

 Washington: Cascade River (head), 2; Easton, 3; Granville, 1; Fort Steila- 



coom, 1; Kichelos Lake, 1; Lake Cnshrnan, 15; Lake Washington, 4; 



Lapnsh, 2; Mount Rainier, 12; Mount St. Helens, 3; Neah Bay, 5; Nis- 



qually River, 4; Olympic Mountains (head El wall River), 2-; Olympic 



Mountains (head Soleduc River), 2; Pacific County, 5; Puget Sound, 3; 



'Washington,' 1. 



ZAPUS TRINOTATUS ALLENI Elliot. Allen's .lumping Mouse. 



Yapits alleni Elliot, Field Columbian Mus., Pub. 27, Zool. Ser., I, No. 10, pp. 212-213, 

 March, 1898. 



Type locality. Pyramid Peak, Lake Tahoe, California. 

 Geographic distribution. Mount Shasta and southward in the Sierra 

 Nevada to Mammoth and North Fork of Kern River, California. 



1 Since the above was written the type and a topotypo have been examined and 

 found to agree with the specimens from Port Moody. 



2 Type aud topotype of Zapus impcrator. 



