DECLIDURUS. 615 



excavation between eyes; eyes large; thumb short, the claw rudi- 

 mentary and nearly contained in wing membrane; tail in a fold 

 beneath interfemoral membrane, its apex perforating a pouch in 

 center of the membrane and appearing on upper surface; upper 

 incisors separated from canines; first upper premolar very small. 



KEY TO THE SPECIES. PAGE 



A. Upper incisors with a second external cusp D. albus 615 



B. Upper incisors without second external cusp D. virgo 615 



FIG. XCVII. DECLIDURUS ALBUS. 



ex Dobson, Cat. Chiroptera. 



575 albus (Declidurus), Weid, Isis, 1819, p. 1630. 



freyreissii Wied, Abbild. zur. Naturg. Bras., pi. xvi. 

 WHITE BAT. 



Type locality. Mouth of Rio Pardo, east coast of Brazil. 



Gcogr. Distr. Costa Rica, south to Brazil. 



Genl. Char. Ears shorter than head, rounded; outer margin of 

 ear conch straight, ending below the eye; tragus broad, short; upper 

 incisors slender, acute, with a second external cusp; lower incisors 

 trifid, central pair separated; first upper premolar very small; first 

 lower premolar smaller than second ; wings from ankles ; claws on feet 

 curved. 



Color. General hue creamy white; hairs darker at base. 



Measurements. Total length, 54.3; tail, 2.2; forearm, 51.8; 

 thumb, 5.5; third finger, metacarpal, 58.4; fourth finger, metacarpal, 

 27.4; fifth finger, metacarpal, 26.4; tibia, 19; foot, 10.1. Skull: 

 occipito-nasal length, 14.5; zygomatic width, 12; interorbital con- 

 striction, 5; depth of occiput, 7; width of braincase, 9; palatal length, 

 5.5 ; length of upper molar series, 5 ; of lower molar series, 7 ; length of 

 mandible from angle, 15. 



576. virgo (Declidurus), Thomas, Ann. Mag. Nat. Hist., 7th Ser., 



1903, p. 377. 

 ESCAZU WHITE BAT. 



Type locality. Escazu, Costa Rica. 



Genl. Char. Upper incisors very weak, the main cone without 



