Ol) 31 1'. K. Aiidei\seii on the litla "/ the 



Nose-leaves. — T^ancet proportionately shorter, its extreme 

 length only a little longer than its width at ba«e. 



JVhiys. — Wing-structure ahno-st precisely as in M. mcfja- 

 lutis, the only noteworthy differrnee being the somewhat 

 sliorter metacarpals. 



Forearm liaired almost to the extremity. Membranes 

 inserted very nearly on tlie ankles. Forearm 43"5-45 mm. 



Calcar. — Slightly longer than the foot. 



Specimens examined. — P(.zo Azul, Costa Rica, 200 m. 

 {S ad., ? ad.). One skull. 



Ranye. — As yet knoAvn from Costa l^iea only. 



Remarks. — Tlie large size of M. hirsuta prevents its con- 

 fusion with any other species of the genus. 



n. GLYPnOXYCTF.RIS, Tlios. 



1896. Gliiphomidens, Oldfield Thomas, Ann. k Mag. N. H. (6) xviii. 

 pp. 301-2 ; Oct. 1, 1896. — Type : Glyphonycteris sylcestris. 



Skull. — Facial portion, immediately in front of orbits, very 

 conspicuously inflated. Anterior nasal openings more hori- 

 zontal in position than in Micronycteris, directed chiefly 

 upwards. Basioceipital pits, antero-internally to coehlese, 

 very deep. 



Dentition. — r very j)rononncedly ehi'<el-shaped, its cutting- 

 blade broad from s'de to side, extremely thin antero-poste- 

 riorly. Canines short, their antero-po>terior basal abaut 

 equal to their vertical diameter. Inner eingulum of j/^ 

 developed into a conspicuous rather broad 'Mieel"; tip of 

 the principal cusp of p^ anterior in position, situated in a 

 vertical line through the front end of the base of the pre- 

 molar ; antero-postcrior basal miich longer than vertical 

 diameter. Inner maryin of the cinyulinn of p^ convex; no 

 distinct " ci.sp 6." 



Ears — Not conjoined by a transverse band across the 

 Lead. Outer margin of ear-conch distinctly concave in its 

 upper half. 



Chin — As in Micronycteris. 



Jt inys. — Third and flfth metacarpal subcqual in length, 

 fuiirth the shortest. Second phalanx of third digit from l.V 

 to li the length of the first j)halanx. 



A comparison Avitli M. meyalotis and hirsuta (in M. minuta 

 tlie hand is peculiarly shortened) will readily show how this 

 modifleation of the wing-structure has been eH'eeted (see 

 ving-indices, below, p. O.l) : — In Ghiphontjcteris the feurtli 

 nietacar])al has, very neaily, the same proportionate length 

 as in M. hirsute/, wheieas the tilth ami. still more, the thinl 



