268 U.S. NATIONAL MUSEUM BULLETIN 288 



nostrils. Tympanum small, not markedly distinct, about one-fourth 

 the diameter of eye, separated from eye by a distance nearly equal to 

 its own diameter. Fingers slightly webbed at base, fourth finger 

 longer than second, just reaching to disk of third which covers an 

 area about one-third again as large as the tympanic area; no project- 

 ing rudiment of a poll ex; no ulnar ridge. Toes slightly more than one- 

 half webbed, the web on fourth toe just reaching the base of the 

 penultimate phalanx, third and fifth toes subequal, disk of fourth toe 

 snugly covering the tympanic area; a distinct oval inner and a smaller 

 but equally distinct rounded outer metatarsal tubercle; no tarsal 

 ridge; no dermal appendage on heel. Body not elongate, in post- 

 axillary region a little narrower than greatest width of head; when 

 hind leg is adpressed, heel reaches almost to nostril; when limbs are 

 laid along the side, knee and elbow overlap considerably; when hind 

 legs are bent at right angles to body, heels overlap greatly. A patagium 

 extends from the back of upper arm to the side of body. Skin of 

 upper parts smooth; a rather narrow glandular ridge encircling upper 

 part of tympanum; skin of throat and chest smooth, that of belly 

 and lower surface of thigh uniformly granular; distinct traces of a 

 skinfold across chest; adult female, no vocal sac. Skin of head not 

 co-ossified with skull, roof of skull not exostosed. 



Dimensions. — Head and body, 24.5 mm.; head length, 7.8 mm.; 

 head width, 8.2 mm.; femur, 12 mm.; tibia, 12.5 mm.; heel-to-toe, 

 11.8 mm.; hand, 7 mm. 



Color in alcohol. — Dorsal ground color dark chocolate brown. 

 A narrow pale stripe passes along the canthus from naris to eye, 

 continuing along the edge of the upper eyelid to behind the eye where 

 it abruptly widens to about the greatest diameter of the tympanum, 

 and continuing posteriorly as a conspicuous dorsolateral stripe to a 

 point about halfway between the sacrum and groin. On each side a 

 narrow white mark extends downward and forward from eye to the 

 edge of upper lip and another wider white band extends downward 

 and backward from eye to the edge of upper lip. The anterior face 

 of each thigh is conspicuously marked with a large oval white spot 

 that is bordered in black. The dorsal and posterior surfaces of thighs 

 are dark but are marked by slightly paler, rounded, lighter blotches. 

 The ventral surfaces are pale. 



Variation. — Structurally and in pattern the series of fresh specimens 

 from the Rio Manso varies somewhat from the type but whether 

 this is due to the fact that the type died before preservation, or that 

 the type is an immature specimen, or to geographic variation, or a 

 combination of reasons cannot be determined. At any rate, this 

 series differs in having the snout more truncate in profile; the digital 



