FROGS OF COLOMBIA — COCHRAN AND GOIN 263 



patagium extends from the back of upper arm to side of body. Skin 

 of upper parts smooth; a rather narrow glandular ridge encircling 

 upper part of tympanum; skin of throat and chest nearly smooth, 

 that of belly and lower surface of thigh uniformly and finely granular ; 

 a rather distinct skinfold across chest; adult gravid female, no vocal 

 sac present. Skin of head not co-ossified with skull, roof of skull not 

 exostosed. 



Dimensions. — Head and body, 33.3 mm.; head length, 10.5 mm.; 

 head width, 10.5 mm.; femur, 14.1 mm.; tibia, 15.2 mm.; heel-to-toe, 

 21.7 mm.; hand, 8.7 mm. 



Color in alcohol. — A pale brown frog with a dorsal pattern of darker 

 brown. The most conspicuous element of the dorsal pattern is a pair of 

 dark stripes, one of which originates back of eye on each side and con- 

 tinues posteriorly to just behind the sacral hump. Each of these stripes 

 is about the width of the upper eyelid. A round dark spot of the same 

 hue lies between the eyes. The can thai region on each side likewise is 

 of this darker hue, and just posterior to the eye, on each side, a band of 

 this darker brown continues through the tympanum to above the 

 shoulder. There are some fuscous flecks on chin and throat, otherwise 

 the ventral surfaces are immaculate, and there are no distinctive mark- 

 ings on the thighs and lower legs although they are pigmented. 



Variation. — In the preserved specimens the most striking variation 

 is noted in the ventral markings, in which they range from nearly im- 

 maculate to being quite heavily mottled on the chin, throat, and belly, 

 reminiscent of the condition in variabilis. While in general the dorsal 

 pattern is made up of two rather discrete dark stripes, there is varia- 

 tion in this. In some specimens the pattern is quite indistinct; whether 

 this is due entirely to natural variation or whether it might be due in 

 part to preservation is not known. In only a few of the specimens where 

 the pattern is discernible are the pair of longitudinal dark stripes on 

 the back interrupted or incomplete. The adults are rather uniform in 

 size. Ten large adults have head-and-body lengths of 30.5, 30.5, 31.0, 

 31.0, 31.1, 31.6, 31.8, 31.9, 32.3, and 33.5 millimeters. There also is 

 some variation in length of hind leg. In most specimens, when the limb 

 is laid alongside the body the heel reaches only to the posterior margin 

 of eye, but in a few it reaches to the anterior margin. 



There seems to be no discernible difference between the specimens 

 from Medellin and those from San Pedro. 



Remarks. — This new species represents the northernmost form of a 

 series of small frogs with well-developed patagia that range in the 

 Occidental Andes of Colombia from Cauca to northern Antioquia. 

 Thus we find columbiana in Cauca, variabilis in Valle, and bogerti in 

 Antioquia. 



In life, columbiana has a patagium that ranges from flesh-colored to 



