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 
Fic. XCVII. DECLIDURUS ALBUS. 
ex Dobson, Cat, Chiroptera. 
575 albus (Declidurus), Weid, Isis, 1819, p. 1630. 
freyretssit Wied, Abbild. zur. Naturg. Bras., pl. xvt. 
Wuite Bat. 
Type locality. Mouth of Rio Pardo, east coast of Brazil. 
Geogr. 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; fitth 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, Pp. 377. 
Escazu White Bar. 
Type locality. Escazu, Costa Rica. 
Genl. Char. Upper incisors very weak, the main cone without 
