126 U.S. NATIONAL MUSEUM BULLETIN 288 



of web between first and second fingers only, but all with lateral 

 ridges, first finger much shorter than second, fourth longer than 

 either, and reaching halfway on penultimate phalanx of third; a very 

 small thumb pad present; a large round palmar callus; metacarpal 

 tubercles well developed. Toes one-half webbed, third toe equal to 

 fifth, both reaching to center of antepenultimate phalanx of fourth; 

 a small but distinct oval inner metatarsal tubercle and a smaller 

 round outer one; subarticular tubercles of toes small and irregular, a 

 few of them double; no tarsal ridge; a heavy skinfold on heel and knee. 

 Body moderately stout, in postaxillary region narrower than greatest 

 width of head. When arm is adpressed, tip of third finger reaches to 

 end of body; when hind leg is adpressed, heel reaches to front of 

 shoulder; when limbs are laid along the sides, knee and elbow touch; 

 when hind legs are bent at right angles to body, heels are narrowly 

 separated. Skin thick, but smooth on head and center of back and 

 upper surfaces; sides of body, top of forearm, and back of femur 

 coarsely granular, some of the granules, especially those on forearm, 

 conical and pointed; venter smooth; a short swollen glandular ridge 

 from posterior corner of eye, ending above shoulder; no skinfold across 

 the chest; no ventral disk; no external vocal sacs in the male, but 

 forearm much enlarged. 



Dimensions. — Head and body, 31.5 mm.; head length, 10 mm.; 

 head width, 9.5 mm.; femur, 11.5 mm.; tibia, 12 mm.; foot, 11.5 mm.; 

 hand, 9 mm. 



Color in alcohol. — Dorsum Vandyke brown, a little darker on eye- 

 lids, above canthus, and on upper limb surfaces, and paler along sides 

 of back, but without any distinct markings; venter buff anteriorly to 

 olive buff on lower limb surfaces, immaculate; side of head clay color, 

 the edge of the mouth pale buff; side of body pale clay color, lightening 

 towards the belly; palms of hands and soles of feet wood brown, the 

 tips of the digits and the palmar and plantar tubercles cream color. 

 Soon after preserving, USNM 103242 from Mt. Chimborazo, Ecuador, 

 was blackish olive; throat maize yellow; belly dirty wax yellow; an 

 orange chrome patch on lower proximal femur, crossing posterior 

 part of belly. Some specimens of this lot are almost uniform dull 

 peagreen below; others are sulphur yellow below, with an orange 

 buff femoral pattern. 



Remarks. — A comparison of critical measurements of 36 specimens 

 from Ecuador with a like number from Colombia indicated no signifi- 

 cant differences. The Colombian frogs had slightly wider heads, but 

 separation would not be advisable on that character alone. 



Considerable differences in toe webbing are found in both countries. 

 In Colombia the webs extend from one-third the toe length to the 

 tips, most having the toes one-half webbed. In Ecuador the toes are 



