504 U.S. NATIONAL MUSEUM BULLETIN 2 88 



its distance from nostril; palpebral membrane not reticulate; inter- 

 orbital distance slightly greater than width of upper eyelid, which is 

 about equal the distance between nostrils. Tympanum rather in- 

 distinct, about one-fourth the diameter of eye, separated from eye 

 by a distance about equal to one-half its own diameter. Fingers 3 

 and 4 webbed at base, fourth finger considerably longer than second, 

 reaching to disk of third which covers about twice the tympanic 

 area; no projecting rudiment of a pollex; no ulnar ridge; humeral 

 spine barely palpable. Toes slightly more than one-half webbed, the 

 web on fourth toe nearly reaching the base of penultimate phalanx, 

 third and fifth toes subequal, disk of fourth toe slightly larger than 

 tympanic area; a distinct oval inner and a smaller, very indistinct, 

 rounded outer metatarsal tubercle; no tarsal ridge; no dermal ap- 

 pendage on heel. Body not elongate, in postaxillary region a little 

 wider than greatest width of head; when hind leg is adpressed, heel 

 reaches tip of snout; when limbs are laid along the side, knee and 

 elbow fail to meet on this gravid individual; when hind legs are 

 bent at right angles to body, heels overlap slightly. No patagium. 

 Skin of upper parts smooth; a rather narrow glandular ridge en- 

 circling upper part of tympanum; skin of throat and chest smooth, 

 that of belly and lower surface of thigh somewhat granular; no 

 trace 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, 33 mm.; head length, 10.9 mm.; 

 head width, 11.7 mm.; femur, 16.6 mm.; tibia, 17.5 mm.; heel-to-toe, 

 25 mm.; hand, 10.4 mm. 



Color in alcohol. — A uniform, rather dark purple above, pale below. 

 Along the sides there is a rather sharp line of demarcation between 

 the dorsal and ventral color. The margin of the upper lip is pale. 

 The dorsal ground color occurs on the upper surface of the upper 

 and lower arm and the base of hands; as a narrow stripe along the 

 upper surface of the thigh and rather extensively on the upper sur- 

 face of the shank and foot. 



Variation. — The material at hand seems to indicate a somewhat 

 variable species but correlation of the variability is difficult. Much 

 of the variation seems to be caused by age, for the smaller specimens 

 are more slender and graceful looking than are the larger (and older?) 

 specimens. The older specimens particularly seem broader through 

 the waist, and they usually are as wide as or wider in the midbody 

 region than in the head. Generally also the smaller specimens are 

 somewhat paler than the larger, but even in these the line of de- 

 marcation between the dorsal ground color and the pale venter is 

 rather sharp. Southern individuals seem to have, on the average, 

 a little more web between the third and fourth fingers than do those 



