156 BULLETIN 43, UNITED STATES NATIONAL MUSEUM. 



Description. — The auricle is erect, of a subrounded form, and in good 

 specimens marked within by four delicate transverse lines; when pressed 

 ou the head the npper border reaches to the median line or extends 

 slightly beyond it. The outer border of the auricle is slightly emargi- 

 uate and with the exception of the border, is of the color of the wing 

 membranes. The border, as just mentioned, is of a darker hue than the 

 rest of the auricle and is naked, except along the posterior border, where 

 it is furnished with a single row of hairs. The remainder of the auricle 

 is hairy. The internal basal lobe is large and reaches to or conceals 

 the eye; it is as broad as the tragus at its widest part. The lower 

 border is oblique from behind forward. The external basal lobe is 

 also large, not revolute, separated from the main body of the auricle by 

 a deep incisure, in which is lodged the basal lobe of the tragus, but not 

 produced at the anterior border to the extent seen in A. novehoraccnsis. 

 When pressed against the side of the head the upper border touches 

 the internal basal lobe. 



The tragus with basal lobe to the outer side of pedicle, which is 

 separated by a deep rounded notch from the main lobe. This notch 

 receives the revoluted border within and below the notch in the auricle. 

 At the widest i)art the tragus is more than half its height. 



The mouth cleft reaches to the second line of the premolar or to the 

 external canthus. The lower lip is fleshy and not fixed to the gum. 

 Two subrounded, subequal buccal folds are present. A wart is found 

 at the angle of the mouth, and a second back of the chin. The snout 

 IS broad, nearly equally in width the length of the mouth cleft, as seen 

 in profile. When the fleshy upper lip is drawn outward the distance 

 between the incisor teeth and the end of the snout is equal to the width 

 of the snout. The nostrils are slightly produced, directed obliquely 

 outward, the space between them concave. The surface is marked by 

 a transverse line of supralabial hairs as in Molossus. The rounded 

 shield between the upper incisors separated from the ui^per lip by a 

 depression. 



Color (ition. — The i)lan of coloration is the same as in A. norehoracensis. 

 On the dorsum of the head and on the ears the hair is light brown to 

 dull yellow, with black base. On the dorsum of the neck and chest the 

 color on the shaft above the basal black is of a dull yellow, to ocher in- 

 stead of bright yellow; the subtip is deep brown, chocolate, umber, or 

 even black, against which the ashy tip appears to good advantage. 

 The last two colors are conspicuous in the unmanipulated fur, and has 

 caused the name "hoary bat" to be given the species. On the loin the 

 shades are darker than elsewhere. On the venter the hair of the side 

 of the face and beneath the jaws is black. The upper half of the neck 

 is dull yellow, with black base; the lower half of the neck is provided 

 with a deep brown subtip, with slight ashy tip; which character of fur 

 extends over the chest and abdomen. As in A. norehoracensis, the line 

 between the neck and the chest is marked by a ring-like disposition of 



