1922] Kellogg: Calif ornian For)ns of Microius Montanus 265 



Snrv.). Lassen County: Milford, 4 (coll. Biol. Snrv.) ; Amedee, 2 

 (coll. Biol. Surv.) ; Susanville, 2 (coll. Biol. Snrv.) ; Willow Ranch, 

 Long- Valley (4225 feet), 2 (coll. Biol. Surv.) ; Pine Creek, 2 (coll. 

 Biol. Surv.) ; Bieber, 4 (coll. Biol. Surv.) ; Haj'den Hill, 2 (coll. Biol. 

 Surv.) ; Eagle Lake, near Merrillville, 2 (coll. Biol. Surv.). Nevada 

 Comity: Independence Lake (7000 feet), 2. Tuolumne County: 

 Sonora Pass (9600 feet), 3 (coll. Biol. Surv.) ; head of Lyell Caiion 

 (9700 feet), 1; Tuolimme Meadows (8600 feet), 19. Mariposa 

 County: Porcupine Flat (8100 feet), 3; Gentry's, Big Oak Flat Road 

 (5800 feet), 2; Yosemite Valley (4000 feet), 26; Vogelsang Lake 

 (10.350 feet), 5; Fletcher Creek near Vogelsang Lake (10100 feet), 

 6; near Mono ]\Ieadows (7300 feet), 6. Mono County: near Mam- 

 moth at head of Owens River (8000 feet), 4 (coll. Biol. Surv.) ; near 

 Mammoth Pass, Sierra Nevada Mts. (8000 feet), 6 (coll. Biol. Surv.) ; 

 Pine City (9000 feet), 3 (coll. Biol. Surv.) ; Mono Lake P. 0. (6500 

 feet), 15; Salmon Ranch, Mono Lake (6500 feet), 11; Farrington's 

 Ranch (6800 feet), 10; one mi. south of Williams Butte (6900 feet), 

 2; Walker Lake (8000 feet), 6; Warren Fork of Leevining Creek 

 (9200 feet), 4. Fresno Countv: Lone Pine Camp, Sierra Nevada Mts. 

 (8000 feet), 4 (coll. Biol. Surv.) ; head of San Joaquin River (8000 

 feet), 5 (coll. Biol. Surv.). 



Diagnosis. — Size large (hind foot 20 to 23 nun. ; condylobasal 

 length of skull in largest individuals, 29.2 mm.) ; skull relatively large, 

 broad and angular (ratio of zygomatic breadth to condylobasal length 

 about 59 per cent), and conspicuously ridged in adults; bullae smaller 

 and flattened below meatus; pelage lighter than in montamis, more 

 buffy or grayish, with diminished admixture of long dark overhairs; 

 underparts grayish in mass effect; ears similar to those of montanus. 



Measurements. — Average of 14 specimens: total length, 177.07 

 mm. (166-189) ; tail vertebrae, 46.5 mm. (39-54) ; hind foot, 20.96 

 mm. (20-22) ; condylobasal length, 28.44 mm. (27.3-29.4) ; occipito- 

 nasal length, 27.02 mm. (25.5-28.5) ; basilar length, Hensel, 25.87 mm. 

 (24.6-26.9) ; nasal length, 8.12 mm. (7.2-9.2) ; zygomatic width, 16.75 

 mm. (15.8-17.9) ; interorbital constriction, 3.73 mm. (3.4-4) ; inter- 

 parietal width, 7.5 mm. (6.5-8.3) ; shelf of bony palate, 15.97 mm. 

 (15-17) ; height cranium at bullae, 9.96 mm. (9.5-10.4) ; mastoid 

 width, 12.64 mm. (12.2-13.4) ; length upper molar series, 6.88 mm. 

 (6.6-7.2) ; length mandible, 17.75 mm. (17.2-18.7). 



Color. — General hue of dorsal area lighter and more grayish than 

 in montanus, the exact shade extremely variable, but with a noticeable 

 darkening from presence of long, dark overhairs ; middorsum varying 

 in coloration from buffy brown to light seal brown or dull clay color. 

 In fresh pelage : hairs of upperparts blackish slate basally, with light 

 tipped portion grading from light or warm buff to light buckthorn 

 brown. Mass effect of upperparts darkened or grizzled by varying 

 admixture of long, fuscous or aniline black overhairs. Sides much 

 lighter than upperparts, with light tipped portions of hairs grading 

 from light buff'y brown to cinnamon buff'; rump, in some specimens, 

 much brighter than rest of upperparts. Underparts neutral gray 

 overlaid b.y white tipped hairs, and occasionally washed with buffy 

 suffusion, irregularly darkened by basal underfur showing tlirougli. 

 Apical two-thirds of whiskers white, basal one-third either white or 



