Mr. R. F. Tomes on the species o/Lasiurus. 223 



No. 1. No. 2. 



in. lin. in. lin. 



Length of the head and body, about ..32 33 



of the tail I 7 1 8 



of the head 9 



of the ears 3^ ^ 



of the tragus 3 2f 



of the fore-arm , 1 9\ 1 9^ 



of the longest finger 3 10 3 8 



of the fourth finger 2 3 2 1 



of the thumb 51 5 



of the tibia 8 8 



of the foot and claws 5 4|- 



of the OS caleis 8 



Expanse of wings 14 13 9 



The dimensions in column No. 1 have been taken from a perfectly 

 adult individual in the British Museum, the locality being unknown. 

 The specimen which has furnished the dimensions in the second 

 column is also full-grown, but nevertheless retains some indications 

 of youth. 



Hab. This second specimen was forwarded with another, perfectly 

 similar, from Chili, by Mr. Bridges. All the other specimens in 

 the British Museum Collection are without authentic habitats. 



4. Lasiurus caudatus, n. s. 



The extreme length of the tail of this species, exceeding that of 

 the head and body, together with the considerable length of the 

 hinder limbs, gives to it a very remarkable appearance, and seems 

 to distinguish it at first sight from all the others of the group. 



The muzzle has much the form and proportions of that of L. nov- 

 ehoracensis. The ears are obtusely triangular, as broad as high, and 

 have their outer margins brought downwards and forwards along 

 the side of the face to within a little distance of the corners of the 

 mouth, and on the same level with it. Here they terminate, as in 

 all the preceding species, in a separated lobe, in this instance more 

 clearly developed than usual. This part of the ear bears consider- 

 able resemblance to the same part in the genus Molossus, but is less 

 considerable in degree. The tragus is narrow at its base, from which 

 it rapidly expands, and abruptly bending inwards, leaves an outer 

 angle and curves to an obtuse point. It differs chiefly from the 

 same part mL.pruinosus in having a more decided inward direction. 



The wing-membranes barely extend to the base of the toes. The 

 tail is longer than the head and body. 



The fur of the forehead extends uninterruptedly in the direction 

 of the nose, and approaches it nearly. As in all the preceding spe- 

 cies, the other parts of the face are moderately hairy. 



The fur of the back encroaches on the membranes of the wings 

 for a distance of about four lines, where it has a clearly defined 

 boundary. That of the under parts extends on to the membrane 



