Geitera ^licroii vctoris r///// (il vpIiniis'titcM'i.s. fil 



Sijiinjisis ()[ liie Fonns. 



J)* with a distinct cusp 0, {i^ nut verv pionoiincedly 

 cliisel-sliaped. ) JJivsioccipital pits shallow. A 

 transverse band between the ears. 3rd an<l 4th 

 metacarpals subeqiial, ilitli tl.e longest. First and 



second plialanx of third di^'it subeqnal Microni/cten's. 



ICars extending beyond tlio tip of the muzzle when 



laid forwards. 



Smaller: ^Jaxillary tooth-row about G'o-8 mm. 



Forearm about .jI-^^. 



/jg as high as y>,. ;;■' as high as/>'. Transverse 



band between ears undivided. Calcar 



longer than foot (c. u.). Po.-itcaudal iu- 



terfemoral longer than tail. Forearm 



practically naked. Underside of body 



darker M. nie//a'oti>i, 



Maxillary tooth-row G-8-7".'i. Forearm 



31-8-30-2 M. m. tupica. 



Maxillary tooth-row 7'4-7"8. Forearm 



352-38 M. m. me.n'cana. 



■p^ much lower than p^. p-' lower than p\ 

 Transverse band between ears divided 

 by a deep median notch into two triangular 

 lobes. Calcar shorter than foot. Post- 

 caudal interfenioral shorter than tail. 

 Muscular part of forearm haired. Under- 

 side of body lighter M. nii/iufa. 



Larger: Maxillary tooth-row about !)••"). Fore- 

 arm about 43"0-45 Af. hirsuta. 



V.tixs not extending beyond the tip of the muzzle 

 ■when laid forwards*. Cross-ridges on ear- 

 conch shcirply defined, crowded*. Fur wood- 

 brown. Small: forearm about 31 mm M. microtis. 



No distinct cusp 6 to p^. (r very pronouncedly chisel- 



• shaped.) Basioccipital pits very deep. No 



transverse band between the ears. 3rd and 5th 



metacarpals subequal, 4th shortest. Second 



].halanx of third digit considerably longer than 



iirst Glyphonycferis. 



Calcar shorter than foot. 



Forearm 45-47 mm G. Behni. 



Forearm about 405 mm G. sylvestri^. 



Calcar longer than foot. Forearm about 40o mm. G. hrKcIiyotis. 



General Remarks. 



M. megalotis. — The two races of M. megalotis are of some 

 interest from a distributional point of view. A vast longitu- 

 dinal tract of S. America, from the Llanos of Venezuela to 

 the Pampas of Argentina — now the Orinoco Valley, tlie 

 Upper Amazons with numerous affluents, and the Parana 

 Kiver system — was, as well known, in a late geological epoch 

 * See footnote on p. ^)r). 



