FROGS OF COLOMBIA — COCHRAN AND GOIN 53 



one-third the tympanum and approximately equal to disk of third 

 finger; a distinct oval inner metatarsal tubercle and a smaller round 

 outer one; a heavy tarsal ridge, ending diagonally across tarsus about 

 two-thirds the distance from metatarsal tubercle to heel; a heavy skin- 

 fold on heel and knee. Body very stout, in postaxillary region equal to 

 greatest width of head. When hind leg is adpressed, heel reaches 

 posterior border of eye; when limbs are laid along the sides, knee 

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

 heels are separated. Skin of upper parts delicate and very easily torn, 

 smooth, with some heavy pustules along the sides and on proximal 

 parts of upper femur; throat and chest minutely pustular, the pustules 

 changing to fine granules on posterior part of belly; a few coarser 

 granules on lower femur; a glandular swelling from posterior corner of 

 eye above tympanum, ending above shoulder; no skinfold across the 

 chest; no ventral disk; a pair of lateral external vocal sacs in the male. 

 Dorsal skin so loose that it can be rubbed to resemble longitudinal 

 dorsal folds, which probably do not occur in life. A pair of lateral vocal 

 sacs and sometimes a widening of the third finger to form a "flange" 

 in the males. 



Dimensions — Head and body, 36.5 mm.; head length, 12 mm.; head 

 width, 13.5 mm.; femur, 17 mm.; tibia, 17.5 mm.; foot, 15.5 mm.; 

 hand, 10 mm. 



Color in alcohol — Dorsum fawn color, with moderately large ir- 

 regular sepia spots scattered over it; a narrow wavy sepia interorbital 

 band, and a transverse irregular spot across snout behind nostrils; 

 upper limb surfaces drab with irregular wood brown cross bars; 

 posterior femur drab with a coarse sepia reticulation; anterior femur 

 and entire venter immaculate ecru drab; side of head fawn color, with 

 the exception of a wide sepia stripe from tip of snout to anterior eye, 

 a trace of which appears behind eye and for a short distance along 

 sides; no light diagonal stripe on side; outer surfaces of feet and hands 

 ecru drab, with faint sepia spots; palms of hands and soles of feet 

 ecru drab, their disks and tubercles pale sepia. 



Remarks — The dorsal skin is extremely fragile and tears readily; 

 consequency, few preserved specimens come out of the collector's tin 

 in perfect condition. This character may prove to be of value in sug- 

 gesting relationships, as it occurs also in other species somewhat 

 similar to P. palmatus in structure and appearance. 



Over its wide range, from the north to the south of Colombia and 

 from east of the Eastern Cordillera to the valley between the Central 

 and the Western Cordilleras, a considerable variation in the critical 

 measurements would have been expected. On the contrary, this species 

 is remarkably stable, as it varies only from 4.8 to 5.5 millimeters in the 

 six measurements that were taken on 105 individuals. 



337-262—70 5 



