43 



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 1\ 



of the ears 3| 3 



of the tragus 3 3 



of the fore-arm 1 8 1 8 



of the longest finger .... 33 36 



■ of the fourth finger 2 2 3 



of the thumb 4 4| 



of the tibia 8| 9£ 



of the foot and claws ... 03^- 04 



of the os calcis. .......... 5 6 



Expanse of wings 13 12 9 



Hah. 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 l'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 peu 

 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- 

 drawn from the membrane, in which a median furrow is left in its 

 stead, from the inspection of which it may be inferred that the tail 

 occupied the whole length of the membrane (as in the other species 

 of this group). 



The upper surface of the interfemoral membrane has some hairs 

 on its base, as in many species of the genus Vespertilio ; and its 

 under surface bears some transverse lines of small follicles. 



The general colour of the fur is bufly-chestnut, glossy above, and 

 paler beneath. 



in. lin. 



Length of the body 2 4 (English). 



Interfemoral membrane along its central line. . 1 9 



Fore-arm 1 7 



Tibia 9 



I now give a description of a specimen evidently of this species 

 collected at Ega, on the Amazon, by Mr. Bates, and labelled by him 

 " houses, Ega." As it appears to be in a better state of preservation 

 than the two obtained from the same place by M. Castelnau, I am 



