12. MOLOS8U8. 409 



eyes, tlieii- points of origin widely separate ; upper three fourths of 

 iuner and outer margin regularly convex, forming almost an arc of a 

 circle ; keel of the car-concli very slightly developed : tragus short, 

 triangular, -with a broad base, acutely pointed, inner margin straight ; 

 antitragus large and round, very similar in shape and size to that of 

 J/, rufus (p. 410), but its base is somewhat broader : muzzle flat, 

 smooth and naked above, extremity obtuse, not obliquely truncated ; 

 the margins of the nasal apertures not prominent, placed high above 

 the margin of the upper lip ; lips smooth, not wrinkled. A distinct, 

 but not large, gular sac in male, rudimentary or absent in female. 



Wings from the distal third of the tibiae. 



Fur very short ; above, dark brown, the bases of the hairs white ; 

 beneath, along the sides of the body, brown ; the chin, neck, and a 

 broad longitudinal band on the chest and abdomen yellowish white. 

 The fur of the body extends upon the wing-membrane above and 

 beneath, nearly as far outwards as a line dravni from the middle of 

 the humerus to the middle of the femur, the remainder of the mem- 

 brane nearly naked ; a few fine hairs appear behind the distal half 

 of the forearm on the upper surface, and clothe the proximal third 

 of the fifth metacarpal bone ; beneath, the wings are quite naked 

 except along the sides of the body. 



Upper incisors long, the centres of their inner sides close together, 

 their bases and summits separated ; lower middle incisors slender, 

 with grooved crowns ; outer incisors very small, between the middle 

 incisors and the canines, and not grooved. First upper premolar 

 large, close to the canine, with a large anterior and internal basal 

 cusp, and a smaller cusp posterior and external ; lower canines, on 

 each side, with a smaU internal basal cusp which nearly touches its 

 fellow of the opposite side. 



Length (of an adidt d ), head and body 2""3, taU 1"'2, tail free 

 from membrane 0"-4, head 0"-85, ear 0"-6, tragus 0"-15x0"-l, fore- 

 arm 1""35, thumb 0""25 ; third finger — metacarp. l"-35, 1st ph. 

 0"-6, 2nd ph. 0"-65 ; fourth finger — metacarp. l"-25, 1st ph. 0"-5, 

 2ndph. 0"-2; fifth finger — metacarp. 0"-85, 1st ph. 0"-4, 2nd ph. 

 0"-15 ; tibia 0"-4, foot 0"-3. 



Hab. Brazil (Buenos Ayres ; Barra do itio Negro) ; British Guiana 

 (Berbice). 



a. S ad., al. Berbice. Purchased. 



b. ad. sk. Eiver Cupari, Amazons. H. W. Bates, Esq. [C.]. 



The next species is probably identical with Myopterus dcmbentonii, 

 GeofProy (Descr. de I'Egypte, ii. p. 113), with which it agrees very 

 closely in the length of its skull, the only remnant of the type of 

 that species, which therefore cannot be accurately determined. Of 

 this skull Prof. Peters (MB. Akad. Berl. 1869, p. 402) has given 

 the following measurements : — " Length 0"-85, width across zygo- 

 matic arches 0"-5, length of upper tooth-row (not including incisors) 

 0"-32, length of lower tooth-row 0"-35." 



