24 NORTH AMERICAN FAUNA. 



ZAPUS PRINCEPS OREGONUS subsp. nov. Blue Mountains Jumping Mouse. 



Type from Elgin, Blue Mountains, Oregon, No. 78156, $ ad., U. S. Nat. Museum, 

 Biological Survey Coll. Collected May 29, 1896, by Edward A. Preble. Original 

 No. 959. 



Geographic distribution. Blue Mountains of Oregon. 



General characters. Similar to Zapus princeps, but differing in color 

 and in cranial characters. 



Color. Early summer pelage : Very similar to Z. princeps, but slightly 

 lighter on sides, especially anteriorly; dorsal area and head more finely 

 flecked with color of sides, the head especially presenting a grayish 

 appearance ; beneath pure white ; whitish edging of ears very indistinct. 



Cranial characters. Compared with Z. princeps from Colorado, the 

 skull of the present form differs as follows: Brain case more rounded, 

 especially shorter and more rounded behind; zygomata shorter; inci- 

 sive foramina larger and very much broader behind; audital bul he 

 slightly smaller. 



Measurements. Type: Total length, 250; tail vertebrae, 154; hind 

 foot, 33. Average of 3 adults from Strawberry Butte, Oregon: Total 

 length, 243; tail vertebra?, 146; hind foot, 32. Skull: Average of 3 

 adult skulls from type locality : Basilar length, 20.1 ; zygomatic breadth, 

 12.9 ; mastoid breadth, 1 1 ; interorbital constriction, 4.4 ; incisor to post- 

 palatal notch, 9.7; foramen magnum to postpalatal notch, 8.5; fron to- 

 palatal depth at middle of molar series, 6.5. 



General remarks. The present form seems to replace Z. princeps 

 throughout the Blue Mountains region of northeastern Oregon. Speci- 

 mens from this region agree very constantly with each other and differ 

 from typical Z. princeps as above indicated. It is much larger than and 

 not at all closely related to Z. montanus, its relative on the west. A 

 specimen from Mountain City, Nev., in the Brunneau Mountains, though 

 differing in many details, is doubtfully referred to this form. Exter- 

 nally it differs considerably from Z. oregonus and agrees with Z. neva- 

 densis, from the Ruby Mountains, Nev., though the skull shows that it 

 is not closely related to that form. The skull of the Mountain City 

 specimen also differs somewhat from that of typical Z. oregonus, and addi- 

 tional material will doubtless show it to represent a form which merits 

 separation. 



Specimens examined. Total number, 9, from the following localities: 



Oregon: Elgin, 3; Harney (10 miles north), 2; Strawberry Butte, 3. 

 Nevada : Mountain City (not typical), 1. 



ZAPUS MAJOR sp. nov. Warner Mountain Jumping Mouse. 



Type from Warner Mountains, Oregon, No. 79983, 9 ad., U. S. Nat. Museum, Biolog- 

 ical Survey Coll. Collected August 4, 1896, by C. Hart Merriam and Vernon 

 Bailey. Original No. 5720. 



Geographic distribution. Known only from the type locality. 

 General characters. Similar externally to Zapus princeps, but larger; 

 skull closely resembling that of Z. trinotatus. 



