42 



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

 the British Museum Collection are without authentic habitats. 



4. Lasiurtjs 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- 

 eboracensis. 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 in L.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 

 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-buff 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.^; C. £ ; P. M. £ ; M. g-rg, 



