BARBOUR AND NOBLE: AMPHIBIANS FROM PERU. 427 



a dark stripe along the cauthus roslralis and dorsolateral fold; sides of the 

 body heavily marbled with black and white; lips white; appendages barred 

 with greyish brown; posterior surfaces of the thighs and under sides of the 

 legs mottled with dark brown; ventral surface of the head and body white, 

 immaculate. 



Dimensions. 



Distance from snout to the vent 63 mm. 



Greatest width of head 23 " 



Distance from axilla to tip of largest finger 40 " 



Distance from groin to tip of largest toe 101 " 



Remarks. Gastrotheca monticola is readily distinguishable from all 

 the specimens of G. marsupiatum examined by its much larger size. 

 The several pouched females of G. marsupiatum in the M. C. Z. from 

 Ecuador vary from 43 to 48 millimeters in length (snout to vent), 

 while none of the ten pouched females of G. monticola in our series are 

 less than 61 millimeters in length. 



Unlike G. holiviana and perhaps other species of Gastrotheca, this 

 species exhibits a well-marked sexual dimorphism. The males in life 

 were always some shade of tan and were heavily blotched with brown. 

 These markings often formed a ) (-shaped figure in the pectoral region. 

 The females were alwav-s green and were less heavily marked. Some- 

 times the females were uniformly green above except for the eye-stripe 

 and a few dark markings on the sides of the body. 



