^•t 



near to the sides of the body, exhibit a siiigularly 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 Raffinesque ap])lied the appropriate epithet " tessellatus." The 

 example in which I have seeu this peculiarity most conspicuous, was 

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

 chigan, by my friend Mr. P. L. Sclater, who, knowiDg how rauch I 

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

 with other North American Bats collected by him in the autumu olF 

 1856. 



Dentition. — In 



The first pre-molar on each sid^ 



C iii PM — M — - 



M. ?:-=i^. 



in the upper jaw is small and 

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

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

 mauner as uot to be visible from the outside. 



Length of the head and body... 



ofthetail 



of the head 



■ of the ear 



ofthetragus 



of the fore ariu 



■ of the longest finger 



2. Lasiurus pruinosus, Say. 



Vespertilio pruinosus, Say, Long'sExped. Rock. Mount. i. p. 168, 

 1825 (?) ; De Kay, Nat. Hist. New York, i. ; Fisch. Synop. Mam. 

 p. 1 13 ; Godm. Amer. Nat. Hist. i. p. 68 ; Hari. Faun. Amer. p. 21 ; 

 Coop. Ann. Lyc. N. H. New York, iv. p. 54. 



Scotophilus pruinosus, Gray, Mag. Zoo\. Bot. ii. p. 498, 1838. 



N y cticejus pruinosus, Temm. Mon. ii. p. 154, 1835-41 ; Wagn. 

 Supp. Schreib. i. p. 544 ; Schinz. Synop. Mam. i. 197. 



Lasiurus pruinosus, Gray, Cat. Mam. Brit. Mus. p. 32, 1843, 



Vespertilio cinereus, Palisot de Beauvois, Cat. Peale's Miiseum, 

 1796. 



It is not unusual to see the name of this species attached to spe- 

 mens of the former, an error not easy to commit, if actual comparison 

 of the two were made. The present one is greatly superior in size 

 to the lašt, and besides this, presents some other very distinctive 

 characters. 



The head is broad, and the forehead flat ; the muzzle is obtuse ; 

 the nostrils are surrounded by a well-defined rim, are directed sub- 

 laterally, and separated by a considerable interval, which is emar- 

 ginate. The ears are irregularly round, their front margins project- 

 ing considerably over the forehead. Their outer or hinder margins 

 are brought forward along tlie sides of the face in the shape of nar- 

 row prolongations, and terminate in two slightly projecting lobes 

 behind the corners of the mouth. The tragiis appears to offer some 

 slight variatioiis of form in differeut individuals, and even in the 



