440 



rTER.\T.orEX ATRATA. 



Upper incisors and cauines, outer lower incisors, and lower canines 

 less lieavy than in anceps (measurements, p. 441). Cingulum of i" 

 raised into a conspicuous obtusely-pointed cusp postero-internally. 

 Posterior basal (cingulum) cusp of iipper canine higher, slenderer, 

 and more narrowly pointed than in anceps ; anterior basal cusp 

 distincth- differentiated, always much smaller than posterior one, 

 but actual size varying somewhat individually. 



Ears (P. Z. S. 1888, pi. xx. fig. 3). — Partly exposed (owing not 

 to laj-ger size thiin in Ft. anctps. but to shorter fur of head); semi- 

 circularly rounded off above, without any trace of an obtusely 

 angular tip. Hairing of coiu'.h as in the allied species. 



/''(()•. — Much shorter than in Ft. anceps, and closely adpressed on 

 hack. Approximate length, back, median lino 1 2-14 mm., laterally 

 5-6, mantle 18-20, belly 13-15. Least width of furred area 

 of back about 30-32 mm. Forearm nearly naked above ; tiltia 

 rather thinh* covered with moderately long hair above for proximal 



External measurements of the species of Pteralopex. 



Forearm 



Pollex, total length, e. u 



„ metacarpal 



,, Isfc phalanx 



2nd digit, metacarpal 



„ 1st phalanx 



,, 2nd-3rd phalanx, c. ii. 

 3rd digit, metacarpal 



,, 1st phalanx 



,. 2nd phalanx 



4th digit, metacarpal 



„ Is-t phalanx 



,. l?iid pbalanx 



5th digit, metacarpal 



„ Isl phalanx 



„ 2nd phalanx 



Ears, length from oriflce 



,, greatest width, flattened . 

 Front of eye to tip ol' mnzzle ..... 



Back i^f eye to base of ear 



In te rfemoral 



Lower leg 



Foot, c. u 



Calcar 



Pf. anccps. 



5? imm.* 



Type. 



mm. 



137 

 61 -.5 

 15o 

 27-5 

 70 

 22 

 19 



100 

 67 



108 

 96-5 

 6(>-5 

 70 



102-5 

 41-5 

 38-5 



Pi. atrata. 



3 ad. 

 (Incl. type.) 



MiN. Max. 



mm. 

 139 



56-5 



13 



28 



68 



18 



18 



95-5 



62 

 101-5 



88 



57 



67 



97 



41 



39-5 



16-5 



14-5 



22-5 



30 

 1 



58 



42-5 



15 



mm. 



14:>5 



59 



13-5 



31 



70 



19-5 



20 



99-6 



66-5 

 108 



96-5 



58-5 



73 

 102 



42-5 



41-5 



19-5 



17 



25-5 



35 

 2 



62-5 



43 



18-5 



* So nearly full-grown that most of the nieMsurenwnts given in this table are 

 directly comparable with those of Pi. niraia. 



