510 U.S. NATIONAL MUSEUM BULLETIN 2 88 



one-fourth the diameter of eye, separated from orbit by a distance 

 equal to about one-half its own diameter. Fingers webbed at base, 

 web extending from base of penultimate phalanx of third finger to 

 base of penultimate phalanx of fourth, webbed only at base between 

 second and third and first and second fingers; fourth finger con- 

 siderably longer than second, reaching to disk of third which about 

 covers the tympanic area; no projecting rudiment of a pollex; no 

 ulnar ridge. Toes slightly more than one-half webbed, the web reach- 

 ing to distal end of antepenultimate phalanx of fourth toe and the 

 middle of the penultimate phalanges of the third and fifth toes; 

 third and fifth toes subequal; disk of fourth toe covering about two- 

 thirds of the tympanic area; a distinct oval inner and a much smaller 

 but distinct rounded outer metatarsal tubercle; no tarsal ridge; no 

 dermal appendage on heel. Body not elongate, in postaxillary region 

 distinctly narrower than greatest width of head; when hind leg is 

 adpressed, heel reaches to tip of snout; when limbs are laid along the 

 side, knee and elbow overlap considerably; when hind legs are bent 

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

 Skin of upper parts rather smooth, no apparent glandular ridge 

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

 that of belly and lower surface of thigh uniformly and finely granular, 

 no trace of a skinfold across chest; adult male, no vocal sac apparent. 

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



Dimensions. — Head and body, 19.2 mm.; head length, 5.7 mm.; 

 head width, 7 mm.; femur, 10.8 mm.; tibia, 10.8 mm.; heel-to-toe, 

 14.2 mm.; hand, 6.6 mm. 



Color in alcohol. — Generally a pale yellowish white above and below. 



Color in life. — Dorsum light green with scattered, roundish yellow- 

 white spots. This color and pattern usually fade rapidly in preservative. 



Variation. — C. fleischmanni is rather uniform in structural char- 

 acters. Most of the variation discernible in any series other than as to 

 the size of the individuals seems to be a function of how long they have 

 been preserved and hence how much they have faded. In large in- 

 dividuals the upper eyelids may appear whiter than the rest of the 

 dorsum, while in smaller individuals they may be no whiter or even 

 darker. Under magnification tiny flecks of pigment may be seen on 

 the dorsum but these form no semblance of a pattern. 



Remarks. — Although we have no record of O. fleischmanni from 

 Colombia, we include it in the fauna of that country since it occurs in 

 both Venezuela and Suriname to the east and in Panama to the west, 

 and its occurrence in Colombia seems to be a certainty. 



Specimens Examined 



COSTA RICA: San Jos<§, NMS 3752 (paratype), USNM 29927-8, 77049-51; 



