REVISION OF THE JUMPING MICE OP THE GENUS ZAPUS. 29 



Color. Summer pelage: Sides rather dark, ochraceous-buff, heavily 

 lined with black-tipped hairs; dorsal area quite sharply defined, griz- 

 zled dusky and yellowish; outer side of legs dusky to heel; tail sharply 

 bicolor, dark gray above and whitish beneath ; fore and hind feet soiled 

 white ; immature, suffused beneath with yellowish. Fall pelage : Dorsal 

 area darker than in summer, thickly flecked with light yellowish, pre- 

 senting a pepper-aud salt appearance; sides yellowish-olive, heavily 

 lined with black-tipped hairs. 



Cranial characters. Skull smaller than those of Z. trinotatus and 

 Z. pr incepts oregonus and much narrower throughout; incisive foramina 

 much narrower posteriorly; bullse smaller. 



Measurements. Eight specimens from type locality average: Total 

 length, 228; tail vertebrae, 135; hind foot, 31. SMll: Three skulls 

 from type locality average: Basilar length, 19.5; zygomatic breadth, 

 12.4; mastoid breadth, 10.1; interorbital constriction, 4.5; incisor to 

 postpalatal notch, 9; foramen magnum to postpalatal notch, 8.3; 

 frontq-palatal depth at middle of molar series, 6.4. 



General remarks. Zapus montanus is a very well-marked form inhabit- 

 ing the entire Cascade Range in Oregon. It is apparently totally dis- 

 tinct from all of the species whose ranges surround its habitat. The 

 type series was taken in August, 1896, near Crater Lake at the head 

 of a tributary of Anna Creek, on Mount Mazama, Oregon. The species 

 was quite abundant in the meadows and the shrubbery of the wet hill- 

 sides, and nearly a dozen were taken within a few days. Several of 

 their summer nests were found. A week or two later other specimens 

 were taken in the same valley a few miles below. These had begun to 

 assume the fall pelage, being slightly more olivaceous. 



Two specimens taken September 9, at Fort Klamath, at the base of 

 the mountains, had assumed the complete fall pelage. They were 

 excessively fat, and were doubtless nearly ready to hibernate. 



Specimens examined. Total number, 16, from the following localities: 



Oregon: Crater Lake (type locality), 9; Diamond Lake, 1; Fort Klamath, 2; 

 Mount Mazama (Anna Creek), 2; Mount Hood, 2. 



ZAPUS ORARIUS sp. nov. Coast Jumping Mouse. 

 (PI. I, figs 4, 4a). 



Type from Point Reyes, Calif., No. 250, $ ad., collection of E. A. and O. Bangs. Col- 

 lected May 14, 1893, by Charles A. Allen. Original No. 618. 



Geographic distribution. Coast of California from Point Eeyes north 

 to Mad River, Humboldt County; limits of range unknown. 



General characters. Size, medium; dorsal area and lower parts 

 strongly suffused with color of sides. Skull rather small and peculiar 

 in shape. 



Color. Type in rather worn spring pelage: Sides of body and head 

 rather dark ochraceous, moderately lined with black-tipped hairs; 

 dorsal area not sharply defined and strongly suffused with color of 



