350 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Georgia and (?northern) Florida, westward through the Southern 
and Gulf States, into Louisiana, and probably eastern Texas. 
General Characters.— Distinguished from megalotis and its sub- 
species by the clear white tips to the belly hairs, and the contrasted 
brown tips and blackish bases of the hair of the back; inner upper 
incisor bicuspidate. 
Color.— Adults: the basal two thirds of the hairs of the dorsal 
surfaces is ‘ plumbeous black,’ the terminal third a uniform cinnamon- 
brown, practically ‘sayal brown,’ in sharp contrast; beneath, the hairs 
are ‘plumbeous black’ basally, their tips clear white, again in sharp 
contrast. Specimens in thin pelage show much less of the cinnamon- 
brown above and the plumbeous bases of the hairs give a predominat- 
ing dark appearance with a streaking of cinnamon; below, the white 
tipped hairs are less numerous particularly on throat and chest. The 
region at the posterior base of the ears is usually dark like the rest of 
the back, but in one specimen is whitish. 
Immature individuals, though similar to adults in the contrasting 
dark bases and white tips of the hairs of the ventral surfaces, are much 
darker above, owing in part to the thinness of the pelage which allows 
the plumbeous bases of the hairs to show through, and in part to the 
paler (almost buffy) tipping of the contour hairs. 
Skull— Though essentially similar, the skull of macrotis differs 
from that of true megalotis and its race pallescens in being slightly 
smaller, and with a flatter profile. The intermaxillary notch is in 
general a trifle more contracted in dorsal view. The inner upper 
incisor of macrotis seems invariably to bear a small cusp on its exterior 
side, whereas in megalotis and m. pallescens this cusp is normally 
wanting, though in two out of twenty-eight specimens it was indicated, 
and in the race mexicanus is usually present. 
Measurements.— No. 159418, Biol. Survey Coll., from Young Harris, 
Union County, Georgia: forearm 43.5 mm. (average of nine speci- 
mens 41.7); digit III, metacarpal 39.6 (average of nine 37.7); first 
phalanx 13.6 (average of nine 12.9); second phalanx 18 (average of 
nine 16.6); tibia 21. 
Skull: greatest length 16.6 mm.; basal length 13.2; palatal length 
7.3; zygomatic breadth —; interorbital constriction 4; mastoid 
breadth 9.5; width of braincase 8.5; upper tooth-row 6; lower tooth- 
row 7. 
Remarks.— In its style of coloraton this bat differs notably from 
megalotis and its races, though in structure it is very similar. Its 
smaller skull, and the constantly bifid inner upper incisor distinguish 
