1905.] NATURAL SCIENCES OF PHILADELPHIA. 663 



its source, and if the frog is close is quite startling. This is clue not 

 only to the suddenness, but also to the volume of sound. On one 

 occasion an example which I captured had his vocal vesicles well in- 

 flated, and though they partly collapsed as I held him in my hand he 

 did not utter any sound. The call bears considerable resemblance to 

 the noise produced by woodchoppers cutting trees a short distance 

 back in the forest, and is different from the cry of any other batrachian, 

 so that when first heard I suspected it was produced by this species. 



In life the general color of the body is muddy-brown above. The 

 lower surface is whitish, with a very diluted tint of dull yellowish in 

 some examples. This was especially noticeable on the lower surface 

 of the head and the forefeet. Side of head l:)rownish . A pale brownish 

 line from behind each eye back toward hind leg, distinct at first, but 

 fading out gradually behind. Edge of upper jaw of same color, though 

 with bronzed reflections in some examples. This color is then contin- 

 ued back as a line from below tympanum to groin. Along the flank it 

 is a little paler and sometimes a little broader than the streak above. 

 It serves to separate similar tinted or blackish-brown blotches of the 

 lower surface from the color of the back. Back variegated with ob- 

 scure blackish blotches nearly as large as pupil, and the same on the 

 upper surface of the legs. Lower surface of legs with blackish- 

 brown variegations, which also extend on the belly, and flanks below, 

 though they vary greatly. Feet dusky, membranes of hind toes with 

 blackish blotches. Tympanum and iris beautiful l^ronzed brown, a 

 narrow ring of bronze encircling pupil. 



Considerable variation as to color is observed in the large series of 

 examples before me. This is striking in the color markings of the 

 lower surface and is to be found in both sexes. Some examples have 

 the dusting of the throat more intense or dark, some nearly white, and 

 in others it is variegated with diffuse blotches of blackish-brown like 

 those on breast. The same is true of the markings of the other lower 

 regions, though they do not have the dusted appearance. In the case 

 of two large females the markings on the under surface of the hind legs 

 are very pale. Though there is a great variation in the extent of the 

 dark coloring of the lower surface the general character of the markings 

 is always retained. No two individuals are alike and the hind legs 

 sometimes differ from one another. Two of Cope's examples are a little 

 smaller than any of mine, though both are more or less mottled or 

 blotched on the belly. As this seems to be the case with all of my 

 smaller or medium-sized examples I suspect it to be a character associ- 

 ated with youth. The style of the coloration of the upper parts is less 



