194 U.S. NATIONAL MUSEUM BULLETIN 2 88 



Eye large, very prominent, its diameter equal to its distance from 

 nostril; palpebral membrane not reticulate; interorbital distance 

 greater than width of upper eyelid, which is in turn slightly greater 

 than distance between nostrils. Tympanum very distinct, about 

 four-fif ths the diameter of eye, separated from eye by a distance equal 

 to about one-third its own diameter. Fingers webbed at base, web on 

 third finger extending to middle of antepenultimate phalanx on lateral 

 side, to base of antepenultimate phalanx on medial side, fourth finger 

 longer than second, reaching to proximal one-third of disk of third 

 finger which covers about one-half the tympanic area; a moderately 

 projecting rudiment of a pollex; a low ulnar ridge. Toes slightly more 

 than one-half webbed, the web on fourth toe reaching the base of the 

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

 covering about one-third the tympanic area; a distinct oval inner and 

 a smaller but equally distinct rounded outer metatarsal tubercle; an 

 inner but no outer tarsal ridge; no dermal appendage on heel. Body 

 elongate, in postaxillary region definitely narrower than greatest 

 width of head; when hind leg is adpressed, heel reaches well beyond 

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

 to axilla; when hind legs are bent at right angles to body, heels con- 

 siderably overlap. No patagium. Skin of upper parts smooth; a well- 

 developed narrow glandular ridge encircling upper part of tympanum; 

 skin of throat and chest finely granular, that of belly and lower surface 

 of thigh uniformly and more coarsely granular; 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, 60.5 mm.; head length, 21.2 mm.; 

 head width, 20.8 mm.; femur, 33.8 mm.; tibia, 37.3 mm.; heel-to-toe, 

 45.8 mm.; hand, 17.8 mm. 



Color in alcohol. — A very light brown frog with faint dorsal blotches 

 of medium brown. These dorsal blotches are rather indefinite and not 

 at all prominent. They are present around the nares, on top of the 

 head, and on the back from the suprascapular to the sacral region. 

 Very faint, broad bands cross the dorsal surfaces of the thighs and 

 shanks. The posterior surfaces of the thighs are heavily mottled with 

 brown on a pale yellowish background. The ventral surfaces are 

 immaculate. 



Variation. — While structurally there seems to be little variation in 

 H. crepitans, pattern-wise the opposite is true. Some specimens are a 

 uniform tan to brown above; others have the dorsal surface tan 

 heavily mottled with dark brown. One specimen (MLS 210) is medium 

 dark brown dorsally heavily flecked with pencil-like dark dots. In 

 some of the specimens the hind limbs are crossed with distinct, broad, 

 dark bands, in others the thighs are uniform dorsally and heavily 



