182 



BULLETIN 43, UNITED STATES NATIONAL MUSEUM. 



than in the male. The base of the hair is pale buff to white. lu the 

 female the venter is slightly lighter fhan the dorsum, but in the male 

 no appreciable difference between the regions exist. The forearm and 

 manus with hair as in I*, perotis calif ornicus. Although many specimens 

 were available for examination, but one of them, a female, was in good 

 condition. In many the hair had been almost entirely lost, and all the 

 specimens had been semimacerated in weak alcohol, and had been lit- 

 erally churned by transportation on mule back under a tropical sun. 



HaMtat. — Eio das Velhas, Brazil. Collected by L. Agassiz (Thayer 

 Exped.). 



Measurements. 



Millimeters. 



Head and body (from crown of liead to base of tail) 92 



Length of arm 45 



Length of forearm 79 



First digit : 



Length of first metacarpal bone 5 



Length of first phalanx 5 



Second digit : 



Length of second metacarpal bone 71 



Length of first phalanx 2 



Third digit: 



Length of third metacarjjal bone 79 



Length of first phalanx 33 



Length of second phalanx 31 



Fourth digit: 



Length of fourth metacarpal bone 75 



Length of first phalanx 26 



Length of second plialaux 6 



Fifth digit : 



Length of fifth metacarpal bone 42 



Length of first phalanx 25 



Length of second phalanx 7 



Length of head 41 



Height of ear 27 



Height of tragus (posterior su rface) 6 



Length of thigh 28 



Length of tibia 26 



Length of foot 14 



Length of tail interfemoril membrane 42 



Length of tail free from iuterfemoral membrane 22 



Measurements of P. perotis, from Dohson. 



Inches. 



Milli- 

 meters. 



Third metacarpal. , 



First phalanx 



Second phalanx 



Fourth metacarpal 



First phalanx 



Second phalanx... 

 Fifth metacarpal. . 



First phalanx 



Second phalanx 



3.5 

 1.30 

 1.20 

 2.85 

 1.5 

 0.25 

 1.70 

 0.90 

 0.25 

 or 0. 35 



42 

 0.09 

 0.35 



