Occasional Papers of tlie Museum of Zoology 3 



cock's specimens were taken in the vicinity of Lakeside, Ber- 

 rien County, in the southwestern part of the state. During the 

 past summer the writer spent the greater part of the month of 

 July in Berrien County, collecting only in the dune region 

 between the towns of Lakeside and Sawyer, and obtained a 

 large number of toads which apparently represent two forms. 



In one form represented in the western Michigan material 

 the warts on the dorsal surface are larger and conspicuously 

 spinous; the parotoids are larger and tend to descend on the 

 sides of the neck, so that they are generally twice as long as 

 broad; the cranial crests are lower and distinctly divergent; 

 the skin of the ventral surface is more coarsely granular, and 

 the granules are often spinous. These specimens are clearly 

 Biifo americanus. In the other form the warts on the dorsal 

 surface are smaller and possess only minute spines,' the warts 

 on the hind legs being conspicuously smaller than in Biifo 

 americanus;^ the parotoids are generally lower, distinctly 

 elongate-oval in form and about twice as long as broad ; the 

 cranial crests are more elevated, and parallel or a little diverg- 

 ent ; the skin of the ventral surface is finely granular, and 

 the granules are never spinous. These specimens conform in 

 structure to the descriptions of Bufo fowleri. 



The two forms also difl:'er strikingly and constantly in color. 

 The specimens which are typically Bufo americanus in struc- 

 ture have the coloration of that species, the ground color being 

 usually reddish or blackish brown; the dorsal spots less regu- 

 larly disposed and constant, in many cases embracing but one 

 wart ; the abdomen generally yellowish or gray, in most speci- 

 mens with dark spots. In the other form the general color 

 above is light or dark gray; large white-edged black spots, 



' Deckert. Inc. cit., p. IIJ., rle'scribes the warts of B. fn-djleri as never spiny, 

 but the original specimen examined, see p. 5, has small spines. 



* This has been noted for B. foivleri by Miller and Chapin, loc. cit., p. 316. 



