162 U. S. NATIONAL MUSEUM BULLETIN 206 



tongue two-thirds as wide as mouth-opening, cordiform, its posterior 

 border slightly notched and partly free; snout almost right-angled and 

 pointed when viewed from above, rounded in profile, the upper jaw 

 projecting somewhat beyond the lower; nostrils lateral, slightly 

 projecting, their distance from end of snout about two-fifths that from 

 eye, separated from each other by an interval equal to about three- 

 fifths their distance from eye. Canthus rostralis very well defined; 

 loreal region concave. Eye large, prominent, its diameter slightly less 

 than its distance from nostril; interorbital diameter about 1% times 

 the width of the relatively narrow upper eyelid, much greater than 

 distance between nostrils. Tympanum large, distinct, about three- 

 fourths the diameter of eye, separated from eye by an interval equal 

 to about one-half its own diameter. Fingers almost one-half webbed, 

 fourth much longer than second, reaching to disk of third, which 

 covers about one-half the tympanic area; a distinctly enlarged tu- 

 bercle on outer part of first finger, representing the rudiment of a pollex; 

 a heavy glandular ridge along outside of. forearm ending in a tubercle 

 on the elbow; toes thi-ee-fourths webbed, fifth slightly longer than 

 third, disk of fourth toe covering about one-third the tympanic area; 

 a prominent projecting inner metatarsal tubercle but no outer one; 

 a slight outer tarsal ridge ending in a distinct, triangular dermal ap- 

 pendage on heel. Body not elongate, in postaxillary region about 

 equal to greatest width of head; when hind leg is adpressed, heel 

 reaches to middle of eye ; when limbs are laid along the sides, knee and 

 elbow overlap ; when hind legs are bent at right angles to body, heels 

 considerably overlap. Skin of upper parts smooth; a pronounced 

 glandular ridge encircling upper part of tympanum and ending above 

 the shoulder in a low gland ; skin of chin smooth, of throat and chest 

 finely granular, of belly a little more heavily granular, of lower pos- 

 terior femur less heavily granular; no apparent skinfold across chest. 

 (A pair of external vocal sacs in the male.) 



Dimensions. — Head and body 38 mm.; head length 13 mm., width 

 12.5 mm.; femur 18 mm.; tibia 19 mm.; foot 15 mm.; hand 13.5 mm. 



Color in alcohol. — The green hylas all appear to lose their color within 

 a few days after preservation, and from then on change but httle. 

 The described individual is a pale buff, immaculate below, minutely 

 covered with very small olive dots on upper surfaces of head, body 

 and tibia. No other pattern is now visible. 



Color in life. — From a sketch by Sandig. Above pale grass green to 

 apple green, lighter on anterior femur, forearm, and foot; disks of 

 toes and fingers straw yellow above; a few small black dots scattered 

 over head and anterior part of back. Throat and chest blue green 

 to beryl green, belly deep olive-yellow, thighs ohve-green, extremities 

 pale and translucent, so that the green bones show through; lower 



