2. NYCTOPHILtrs. 171 



1. Autrozous pallidus. 



Vespertilio pallidus, Leccmte, Proc. Phihd. Acad. Nat. Sci. 1 856, p. 43. 

 Antiozous pallidus, Allen, Proc. Philad. Acad. Nat. Sci. 1862, p. 247 ; 

 Monogr. Sots N. America, p. 68, figs. 65-67 (1864). 



Muzzle cylindrical, shortly conical in front, the extremity trun- 

 cated and terminated by a small, not weU-defined disk, bounded 

 above by a very slightly raised ridge (Plate XI. fig! 6) continuous 

 with the outer and upper margins of the nasal apertures, which are 

 directed forwards ; ears longer than the head, triangular above, but 

 the tips are obtuse and the outer and inner margins convex ; base 

 3f the inner margin of the ear-conch very convex, outer margin 

 termiuatiag abruptly midway between the base of the tragus and 

 the angle of the mouth ; tragus long, attenuated upwards towards 

 its subacute tip, inner margin straight, outer convex, with a slightly 

 irregular margin below, straight in upper half. 



Tail long, of eight vertebra, the last free or half-free ; feet mode- 

 rately large ; wings from the base of the toes. 



The muzzle is nearly naked in front of the eyes, and the fur 

 scarcely extends upon the wing- or interfemoral membranes. 



Fur, above, pale yellowish brown, the base of the hairs pale buflE ; 

 beneath, pale buff. 



Upper incisors unicuspidate, well developed (Plate XI. fig. 6 b) ; 

 lower incisors trifid ; last upper molar very narrow, forming a trans- 

 verse plate only (Plate XI. fig. 6 a). 



Length, head and body 2"'4, tail l"-8, free from membrane 0""1, 

 head 0"-85, ear 1" x0"-55, tragus 0"-55, forearm 2", thumb 0"-38 ; 

 third finger— metacarp. l"-75, 1st ph. 0"-6, 2nd ph. 0"-85 ; fifth 

 finger — metacarp. l"-6, 1st ph. 0"-45, 2nd ph. 0"-4; tibia 0"-85, 

 calcaueum 0"-55, foot 0"'33. 



Hab. Western North -America (Texas, Oregon, California, N. 

 Mexico). 



a. $ ad., al. Mammoth VaUey, California. Dr. Brown [C.]. 



b. J ad., al. California. Smithsonian Institute 



c. skeleton. California. Smithsonian Institute 



2. NTCTOPHILUS. 



Nyctophilus, Leach, Trans. Linn. Soc. xiii. p. 78 (1822) ; Temminck, 

 Monogr. Mammal, ii. p. 47 (1835-41) ; Wagner, Suppl. Schreb. 

 Sdugeth. V. p. 649 (1855) ; Tomes, P. Z. S. 1858, p. 26. 



Barbastellus, G)-ay, Zoolog. Miscell. 1831, p. 38. 



Crown of the head slightly elevated above the face-line ; muzzle 

 narrow, very similar in general shape to that of Plecotus ; nostrils 

 at the extremity of the muzzle in the front margin of a fleshy emi- 

 nence, their upper margins continuous with the base of a small 

 cordate nose-leaf; ears large, oval, conjoined by a band arising from 

 the forehead between the eyes ; tragus short, triangular, in outline 

 somewhat simUar to that of Synotus ; eyes large. Wings from the 

 base of the toes ; tail almost wholly contained within the inter- 

 femoral membrane. 



