XuMBER 47 October 13. 1917 



OCCASIONAL PAPERS OF THE MUSEUM OF 

 ZOOLOGY 



UNIVERSITY OF MICHIGAN 



Ann Arbor, Michigan Published by the University 



ON THE OCCURREXCE OF BUFO FOIVLERI IN 

 MICHIGAN 



• By Alexander G. Ruthvex 



The similarity between Biifo aiiicricajtiis and Biifo fowled 

 has been referred to frequently in the literature of American 

 herpetology. vSo closely do these forms resemble each other 

 that they are often confused, and it has been suggested that 

 hybridization occurs.^ The distinguishing characters of Biifo 

 fozdcri that have been pointed out are : cranial crests usually 

 parallel and considerably elevated, sometimes fusing posterior- 

 ly ; muzzle projecting farther beyond the jaw; warts on dorsal 

 surface smaller ; granules of ventral surface smaller (oc- 

 casionally absent);- parotoids elongate-oval in form; iris 

 silvery; head narrow, higher and shorter; profile abruptly 

 rounded ; hind legs longer ; color above yellowish or greenish 

 gray, never rich yellow, orange or red-brown ; dorsal spots 



1 Deckert, Richard. Science, N. S., XLV, pp. 113-114; and Miller, W. and 

 Chapin. Tames. Ibid., XXXIT, pp. .^1^-317. 

 ^ Deckert, he. cit., p. 11 4- 



