342 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
‘pinkish buff,’ the hairs paling on their middle third and darkening by 
imperceptible degrees to gray or slate gray at their extreme bases. 
Downy hairs at the posterior bases of the ears whitish. Below, the 
general appearance is ‘pale ochraceous buff,’ the hairs darkening 
gradually toward their bases to a neutral gray, except in the middle 
region of the throat, where usually the hairs are not perceptibly darker 
at base. 
Immature specimens have the pelage more dusky throughout than 
the adults. The basal two thirds of the hairs above is nearly ‘neutral 
gray’ with short pale tips of buffy, nearly ‘vinaceous buff.’ Below, 
the color is paler, the light tips of the hairs a soiled whitish. 
Color V ariation.— In a large series of skins that may fairly be taken 
to represent pallescens, there is much individual variation in the 
intensity of coloring among adults. A specimen from Ash Creek, 
Graham Mts., Arizona (204375 Biol. Survey Coll.) has the basal halves 
of the hairs ‘slate color’ producing an effect much darker than usual. 
It may be considered a step in approach to the dark subspecies of the 
Mexican highlands. Two specimens (10694, 10695 Univ. of Cali- 
fornia Coll.) obtained by Dr. Joseph Grinnell at Riverside Mountain, 
Colorado River, southeastern California, are the brightest colored 
individuals I have seen, with a distinct reddish cast to the upper 
surface, nearly ‘vinaceous cinnamon,’ shading into a ‘buff pink’ 
below, ‘the bases of the hairs only slightly darkened. The palest 
specimen of all is one collected in the hills back of Lone Pine, California, 
by Dr. Theodore Lyman’s expedition of 1915. It is ‘pale pinkish 
buff’ above and nearly white below to the roots of the hairs. Apart 
from these slight variations pallescens is remarkably uniform in tint 
over a wide range of territory. 
Skull— The skull of this race is hardly to be distinguished from 
that of true megalotis. To the eye, it seems a trifle narrower across 
the rostrum but the difference is not clearly brought out by measure- 
ments. The upper inner incisor is normally without the lateral 
cusp characteristic of macrotis. 
Measurements.— No. 333%, Coll. Amer. Mus. Nat. Hist., from 
Prescott, Arizona: forearm 43 mm. (average of four Arizona speci- 
mens 42.6); digit III, metacarpal 37.3 (average of four 37.5); first 
phalanx 13 (average of four 13); second phalanx 16 (average of four 
17.2); tibia 18. Collector’s measurements, No. 2043875, Biol. Sur- 
vey Coll., Graham Mts., Arizona, total length 102 mm.; tail 50; 
foot 9; extent of wings 300. 
Skull: No. 204375 Biol. Survey Coll., Graham Mts., Arizona: 
