182 U- S. NATIONAL MUSEUM BULLETIN 2 06 



groin, in the postaxillary region considerably less than greatest diame- 

 ter of head; limbs exceedingly slender, femur and humerus, especially, 

 appearing attenuate and without muscular development; when hind 

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

 sides, knee and elbow^ overlap; when hind legs are bent at right angles 

 to body, heels just touch. Skin of upper parts smooth; a faint 

 glandular ridge encircling upper part of tympanum and dropping 

 down sharply behind it to end in front of the shoulder; a similar faint 

 glandular ridge along the loreal region from nostril to eye; skin of 

 throat and chest smooth, that of belly and lower part of thighs gran- 

 ular; no apparent skinfold across the chest. Apparently an internal 

 median vocal sac. 



Dimensions. — Head and body 49 mm.; head length 18 mm., width 

 18 mm.; femur 24 mm.; tibia 24 mm.; foot 17 mm.; hand 12 mm. 



Mathematical analysis (in percentage of the total length) : 



Color in alcohol. — Fawn color above, slightly mottled, lightening to 

 ecru-drab on sides of body and head; a dark, seal-brown, median line 

 starting at the tip of the snout and fading out behmd the occiput; 

 sides from axilla to groin wdth a great number of vertical, wavy, thread- 

 like dark markings which anastomose more or less dorsally, and lighten 

 and merge with the fawn dorsal coloration. Limbs with irregular 

 wide brown bands, rather indistinct above, but darkening and ending 

 in little threadlike marks on the anterior part of fem.ur and posterior 

 part of tibia. Ventral surfaces pale olive-buff, immaculate. 



Variations. — In a small series of adult and partly grown specimens 

 a great variation is to be seen in the length of the leg. In two or three 

 the heel reaches easily to the tip of the snout when adpressed, and 

 there is corresponding length of tibia and femur in relation to body 

 length, when compared to the other specimens in which the heel only 

 reaches the anterior eye or nostril. Another difference is in relative 

 size of finger disks compared to tympanum. In four specimens, in- 

 cluding the described example, the finger disks (even when not dried 

 accidently) are very small, covering about one-fourth the tympanic 

 area. Two of the frogs have much larger, rounder disks, obscuring 

 at least one-half the tympanum when applied to it. The toe-disks do 



