394 Zoological Society : — 



are ouly observable on the upper surfaces of the membranes and 

 Umbs. This singular part of the cutaneous system is marked by a 

 regular and decided outline, and can scarcely be said at any place to 

 graduate into the smooth membrane of the wings. Its extent is pretty 

 well indicated by the hairy portions of the membranes in the genus 

 Lasiurus, excepting that it only occupies one-half of the interfemoral 

 membrane. 



In its general character, the fur is short, crisp and thick, having 

 a grizzly shining appearance, very similar to that of some of the 

 Soricidce. That of the head extends towards the nose, and covers 

 the whole of the face, being bounded anteriorly by a frill of stiif up- 

 right hairs ; that commencing near the corner of the mouth extends 

 upwards in front of the eye, and meets on the top of the nose with 

 the corresponding part of the other side of the face. On all the 

 upper parts of the body the fur is similar. It is dusky at its base, 

 and tipped for half its length with shining grey-brown, having a 

 slight tinge of olive. Beneath, the fur is brown at its base, with shi- 

 ning tips of grey-brown. The fur of the throat extends to the chin 

 and under-lip, and densely covers the whole, excepting the extreme 

 edge of the lip. 



The whole of the cutaneous system is very dark brown, with the 

 exception of the wrinkled part already mentioned, which is paler, 

 and tinged with yellowish. 



The cranium exhibits some peculiarities worthy of note. Viewed 

 from above, the cerebral portion is seen to be about as much arched 

 as that of Vesp. Nattereri, and has a faint sagittal crest towards the 

 occipital region. There is also a moderately pronounced occipital 

 crest, which becomes more strongly developed in the vicinity of the 

 acoustic elements of the skull. The auditory bullae have much the 

 same form and proportion as the same parts in Vesp. Nattereri, and 

 the facial portion of the skull is proportioned much as in that species. 

 The orbital openings are of very moderate size, and the zygoma but 

 little arched, and very slender. The bony palate terminates a little 

 posteriorly to the last molar. The nasal opening is small, and the 

 intermaxillary bones meet in front, for the support of the contiguous 

 incisors, as in Miniopteris and Furipterus among the Vespertilioimia, 

 and Molossus, Rhinopoma, and Noctilio among the Noctilionina. 



The incisors in the upper jaw are two in number, large, conical, 

 and pointed. They are provided with a distinct cingulum, visible 

 in front, which passes into a well-marked basal lobe, or cusp, behind 

 the tooth. As the incisors are situated very near to the canines, and 

 are themselves in contact, this lobe is only visible when seen directly 

 from behind. The incisive foramina are two in number and very 

 minute. The canines are long, pointed, and triangular, without any 

 basal lobe. The next two teeth in the upper jaw present the same 

 forms which usually characterize the premolars in the insectivorous 

 Cheiroptera ; and the three remaining teeth, i. e. the molars, may be 

 similarly passed over. 



The hinder part of the lower jaw is formed very similarly to the 

 same part in the genus Fespertilio, but has the posterior process less 



