218 



Zoological Society .- 



tiguous to and on the membranes ; this is unicoloured and pale 

 buff. 



Hub. North America, " from one end of the country to the 

 other, equally numerous " {Le Conte). 



Far. 2. Similar to the last, but with the colour brighter and 

 without the white tips to the fur. 

 Hub. The same as the last. 



Var. 3. Fur of the upper parts nearly black at the base, suc- 

 ceeded by yellowish-buff, passing into bright ferruginous-red, shining 

 and silky. That on the iuterfemoral membrane uniform bright fer- 

 ruginous. Beneath, the fur is nearly black at its base, passing into 

 dark brown, and tipped with bright rust-colour. The fur on the 

 under surface of the membranes is also of the latter colour. Some- 

 times this variety has the chin and throat of a yellowish-buff co- 

 lour, and then answers well to the description of Nycticejus varius, 

 as given by Poeppig. 



Hab. South America ; Jamaica ; Canada. 



In all these varieties a white spot is observable at the axilla. The 

 membranes appear to be light or dark, according to the depth of 

 the colour of the fur. Frequently the membranes of the wings, 

 near to the sides of the bod}^, exhibit a singularly spotted appear- 

 ance, occasioned by the network of veins being paler in colour than 

 the portions enclosed by them. It was probably to one of these 

 that Rafinesque applied the appropriate epithet " tessellatKS." The 

 example in which I have seen this peculiarity most conspicuous was 

 obtained in the Island of Mackinac, between Lakes Huron and Mi- 

 chigan, by my friend Mr. P. L. Sclater, who, knowing how much I 

 am interested in this order of ^laramals, kindly presented it to me, 

 with other North American Bats collected by him in the autumn of 

 1856. 



Dentition. — In. 



P.M. 



2-2 TtT 3-3 14 



The first pre-molar on each side in the upper jaw is small and 

 rudimentary, and perhaps is sometimes wanting. It is placed in the 

 angle between the canine and the contiguous pre-molar, in such a 

 manner as not to be visible from the outside. 



Length of the head and body... 



of the tail 



of the head 



^ of the ear 



of the tragus 



of the fore arm 



of the longest finger ... 



2. Lasiurus pruinosus, Say. 



Vespertilio pndnosus, Sav, Long's Exped. Rock. ^Vlount. i. p. 1G8, 

 1825 (0 ; De Kay, Nat. Hist. New York, i. ; Fisch. Synoji. Mam. 



