FROGS OF COLOMBIA — COCHRAN AND GOIN 79 



thigh where it joins the body and usually present in the axillary 

 region, and by having the posterior portion of the pre vomer absent. 



Description. — FM 266, from Villa vicencio, Meta, Colombia. A 

 microhylid frog without vomerine teeth; choanae moderate in size, 

 ovate, placed well forward in the roof of the mouth. Tongue half as 

 wide as mouth opening, an elongate oval in outline, its posterior half 

 free and unnotched. Snout short, pointed when viewed from above, 

 pointed in profile, the upper jaw extending considerably beyond lower; 

 nostrils more lateral than superior, not at all projecting, their distance 

 from end of snout about one-half that from eye, separated from each 

 other by an interval equal to about two-thuds their distance from eye. 

 Canthus rostralis but very slightly defined; loreal region distinctly 

 rounded. Eye small, inconspicuous, its diameter less than its distance 

 from nostril; palpebral membrane not reticulate; interorbital distance 

 about three times the width of upper eyelid, which is even less than 

 distance between nostrils. Tympanum concealed. Fingers unwebbed, 

 fourth finger about equal to second, reaching to base of penultimate 

 phalanx of third; no projecting rudiment of a pollex; no ulnar ridge. 

 Toes without webs, fourth toe nearly two phalages longer than third ; 

 a distinct oval inner but no apparent outer metatarsal tubercle; no 

 tarsal ridge; no dermal appendage on heel. Body short, in post- 

 axillary region at least twice the greatest width of head; when hind 

 leg is adpressed, heel reaches axilla, when limbs are laid along the 

 side, knee and elbow fail to meet; when hind legs are bent at right 

 angles to body, heels touch snugly. Skin of upper parts smooth. A 

 narrow but distinct fold of skin crosses the back of the head and turns 

 down on each side to pass behing the eye and the angle of the jaw. 

 Skin oi throat, chest, belly, and lower surface of thigh uniformly 

 smooth; adult female, no vocal sac. 



Dimensions. — Head and body, 43.5 mm.; head length, 10.1 mm.; 

 head width, 11.1 mm.; femur, 15.8 mm.; tibia, 15.9 mm.; heel-to-toe, 

 18.4 mm.; hand 10.8 nun. 



Color in alcohol.- — -Top of head and dorsum dark grayish brown. 

 Underside of throat, chest, belly, and limbs faintly flecked yellowish 

 gray. Rather distinct yellowish subaxillary and groin spots and a 

 narrow yellowish line on the posterior surfaces of the thighs. 



Variation. — The specimens at hand, all from the northern part of 

 the range of the species, seem to be rather uniform in both pattern 

 and structure. The rather distinctive, isolated yellow spot in the 

 axilla and the one on the anterior face of the thigh where it meets the 

 groin apparently are quite good key characters, for the inguinal spot 

 on the thigh is present in every individual and the axillary spot 

 appears in all except one specimen from Villa vicencio. These same 

 yellow areas are present in 11. pearsei, but in that species such areas 



