Saccopteryx ii-c.Jrom South America. 367 



S. hpfura, I cannot believe that this very differently coloured 

 bat, which more resembles Rlnjnchonycteris naso in its general 

 appearance, should be assi^Micd to that species. Schreber's 

 animal is figured as dark brown, without any trace of supra- 

 orbital white streaks, and is therefore clearly the darker 

 coloured of tiie two forms. 



Saccopteryx gymnura, sp. n. 



Size about as in S. leptura. Ears narrow, generally 

 shaped as in S. leptura^ but with a slight concavity at the 

 upper third of the inner margin, as in S. canescens. Tragus 

 of median length, its inner and outer margins straight, its 

 tip rounded off. Nostrils and lips as in S. leptura. Feet 

 quite different from those of the other members of the subgenus 

 Saccopteryx, for instead of being long and wholly free of the 

 membranes, they are short, stumpy, and involved in the mem- 

 branes, the wing-membrane being attached towards the distal 

 end of the metatarsus and the calcar being bound to the foot 

 nearly up to the base of the fifth toe. Wing-sac as in the 

 restricted Saccopteryx. Base of interfemoral membrane 

 ]>ractically naked above, contrasting in this respect with the 

 other species; there are a few fine hairs on this part, but 

 they are almost imperceptible. 



Colour apparently, so far as can be judged by a spirit- 

 specimen, dark throughout, as in the true S. leptura. The 

 centre of the back has unfortunately lost its fur, so that I 

 cannot say if light stripes were present ; in all probability they 

 were. 



Skull in its size and delicate build closely similar to that 

 of S. canescens, but the postorbital processes are very much 

 more developed, standing boldly out to the level of the zygo- 

 mata (see measurements). 



Dimensions of the type (in spirit) : — 

 Forearm 35 millin). 



Head and body '61 ; tail 14*5 ; ear l'.\; tragus (on inner 

 edge) 2'5 ; tibia \'d; hind foot, s. u. -4, c. u. 4"o ; calcar 11. 



Skull: extreme length 12*7; basal length lO'-i; zygo- 

 matic breadth 8; interorbital breadth ;V3 ; tip to tip of post- 

 orbital processes O'O ; intertemporal breadth 1'7; breadth of 

 brain-case 6*1 ; length of upper molars 2 1 ; front of lower 

 canine to back of »i,3 5. 



IJab. Santarem, on the Amazon. 



Type. Female. B.M. no. 75. 10. 22. 2. Specimen c of 



S. hplura in Dobson's Catalogue. Culleeted by Mr. W^ickham. 



The marked difference in tiic structure of the feet, in which 



25* 



