4 University of Michigan 



arranged as in Bufo foz^'Icri, are present and usually embrace 

 several warts ; a lateral pale streak occurs ; the vertebral stripe 

 is constantlv present and generally broad, and the ventral sur- 

 face of the body is silvery white and immaculate, except that 

 in some specimens a few dark spots are present in the pectoral 

 region. ** 



The two forms apparently do not differ in proportions, nor 

 do those which resemble B. fowleri agree with the proportions 

 of that species as given by Dickerson. The length of the head 

 enters the total length a little less than 3.5 times, and the 

 length of the hind leg to the heel equals the length of the 

 body forward to some point on the parotoid. It should be 

 noted, however, that the proportions just given are taken 

 from preserved material ; that while Miss Dickerson states in 

 her key [loc. cit.. p. 45) that the total length is 4)^ times the 

 head length in B. fowleri and 4 times the head length in B. 

 aincricaniis, in her descriptions of the species (loc. cit., pp. 63 

 and 94) the head length is said to enter the total length about 

 4 times in B. fowleri and 4-4 J/ times in B. americanus; and 

 that Miller and Chapin {loc. cit., p. 316) state that no differ- 

 ences in proportions between the species can be noted. 



Miller and Chapin (loc. cit., p. 316) state that the iris is 

 bronze in color in Biifo aiiicricaiiiis, and that it is silvery in 

 B. fowleri; and Hancock (loc. cil., p. 257, legend of figure) 

 intimates that this is a distinguishing character of the Michigan 

 specimens examined by him. Allard,^" however, says that this 

 character cannot he. relied upon to separate the two species, 

 and the writer has failed to find any constant difference in the 

 color of the iris in the Michigan specimens. 



The breeding season was past when the toads were collected ; 



"Miller and Cha|)in. Inc. cit., p. 316, state that the chest of Bufo fowleri may 

 be spotted. 



1' Science, N. S., XLIV, p. 464. 



