BARBOUR AND NOBLE: AMPHIBIANS FROM PERU. 397 



and the lower edge reticulated with white. Upper lip and lower part of the 

 face, from a line connecting the nostril and tympanum, fleshy white; limbs 

 pale brown blotched with dark brown; liinder sides of thighs reticulated with 

 white; lower parts and ventral surface of body pinkish white, immaculate. 



Dimensions. 



Distance from snout to vent 33 mm. 



Greatest width of head 11 



Distance from axilla to tip of longest digit 19 " 



Distance from groin to tip of longest toe 46 " 



Notes on Paratypes. The twelve other specimens of the series 

 range in size from fifteen to thirty-two millimeters (snout to vent). 

 One specimen still possesses a large part of the tail. The small speci- 

 mens are very different in coloration from the adult. Instead of the 

 ventral surface being immaculate there is present a heavy wash of 

 grey extending completely over the throat, chest, and anterior part 

 of the abdomen. In most of the small specimens this grey wash is 

 finely spotted with white. The young of P. latinasus do not have 

 the grey wash. iVt least they are not so recorded. One specimen 

 (M. C. Z. 2,899) of P. latinasus from Chimbo, Ecuador is of nearly 

 the same size as two of our small specimens and yet there is no trace 

 of the gre}' wash. In two of the large parat^^es of P. sylvatica, both 

 males, this wash is present but only faintly indicated, while it is entirely 

 absent in all of the adult females. 



There are only two adult males in the collection. These differ from 

 all the other specimens in being weakly tubercular above. x\pparently 

 in this species as in B^ifo mar inns — to a greater extent — rugosity is a 

 secondary sexual character. It has been shown that the males of 

 certain other species of Phyllobates transport the larvae on their 

 back. Two tadpoles of this species w^ere taken in a small pond. 

 These do not differ materially except in size from the tadpoles of the 

 tadpole-carrying-species, P. subpundatus {cf. Ruthven and Gaige, 

 Occas. papers, Univ. Mich., 1915, no. 10). Still in the two tadpoles 

 of P. sylvatica the second row of teeth is divided by a much shorter 

 interspace than in the tadpoles of P. subpunctatus. If the male of 

 P. sylvatica does carry its larvae, it is possible that the rugosity may 

 help the tadpoles to maintain their hold. 



Besides the presence or absence of the ventral wash of grey, there 

 are other variations in the adults. The dorsal surface may be brown. 



