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 megaJotis 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 viegalotis 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 viacrotis seems invariably to bear a small cusp on its exterior 

 side, whereas in megaloiis 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. 159413, 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 IS (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 



