224 Zoological Society : — 



beneath the humerus, but has no regularly defined margin. Between 

 the fore-arm and the fourth finger, in the angle formed by the two, 

 is a growth of extremely short downy hairs of a yellow colour. The 

 upper parts of the feet are moderately hairy, much less so than is 

 usual in L. pruinosus and L. noveboracensis. On the upper surface 

 of the interfemoral membrane, the fur of the rump extends only for 

 half its length, the remaining half being naked. Its under surface 

 is sparingly clothed with hairs for about one-third of its length, near 

 to the tail only ; that part of the membrane near to the knees and 

 the end of the tail being quite naked. 



The membrane itself is rather thickly marked with transverse 

 dotted lines. 



The fur is rather long and silky ; that of the whole of the upper 

 parts is of a uniform yellowish-buif colour, brown for a short length 

 in immediate proximity to the skin. Beneath, it is reddish-brown 

 at the base for about a third of its length ; the remainder being yel- 

 lowish-buff. 



Dentition.-In.i^; C. ^j ; P.M.l,^; M. ^J=fJ. 



No. 1. No. 2. 



in. lin. in. lin. 



Length of the head and body .... 19 20 



of the tail .... 2 2 6 



of the head 7\ 



of the ears ^ 3 



of the tragus 3 3 



of the fore-arm 1 8 1 8 



of the longest finger .... 3 3 36 



of the fourth finger 2 2 3 



of the thumb 4 4^ 



— of the tibia 8| 9^ 



of the foot and claws .... 3|^ 04 



of the OS calcis 5 6 



Expanse of wings 13 12 9 



Hab. Pernambuco, from which place the specimen was received 

 which furnished the above description, and the dimensions in column 

 No. 1. No. 2 is from a specimen in a bad state in spirit, from Chili. 

 I have met with no other examples than the ones here described. 



5. Lasiurus Aga, p. Gerv. 



Nycticejus Aga, P. Gerv. in Castelnau, Exped. dans les parties 

 centrales de I'Amerique du Sud, &c., livr. 16. p. 73, 1855. 



The following description is taken from that by the original de- 

 scriber. 



Ears subround ; tragus in the form of a hooked knife ("a pen 

 pres de la forme d'une serpette""). The nostrils are subtubular, 

 pierced in the sides of the small nose, which is a little emarginate in 

 the centre. 



Tail, in the two specimens examined, absent, having been with- 



