AMPHIBIANS. 49 



is rapid, tlie eggs liatcliiiig in about two weeks. Metamorphosis is 

 completed early in June. 



Distribution: Entire United States and novlli in Canada to the 

 Hudson Bay region. (Dickerson, lOOG.) 



Michigan: Specimens in the University Museum from Dickinson. 

 Huron, Washtenaw and St. Jose})h Counties. The writers have 

 also examined specimens from Gratiot County. Reported from 

 Eaton County (Clark, 1902) ; Antrim and Eaton Counties (Gibbs, 

 Notestein and Clark, 1905); Huron County (Ruthven, 1911a). 



KANA PIPIENS Shreber. 



LEOPARD FROG. 

 (PI. IV b.) 



Description: Body long and slender. Head long and pointed at 

 the snout. Lateral folds prominent; there may be several smaller 

 folds between them. Skin smooth above; under surface of thighs 

 slightly granular. A glandular fold extending from corner of 

 mouth over the shoulder. Legs long and very powerful ; feet partly 

 webbed, webs deeply indented. Tubercles under joints of toes 

 prominent. Vomerine teeth in two patches between internal nares. 



Ground color green, gra}^ or brown above. Lateral folds lighter; 

 between them two irregular rows of rounded dark spots edged with 

 lighter. Several rows of smaller rounded spots below lateral folds. 

 Under surface j^ellowish white, frequently with dark spots across 

 pectoral region. A dark line extending from muzzle to shoulder 

 through eye; light lines above and below the darker line make the 

 latter more noticeable. Upper surfaces of limbs transversely barred 

 or blotched with darker. Concealed surface of femur venniculated 

 with brown. 



Aleasurements: Specimen No. 37S(W. 



Length of head and body 087 



Length of hind limb to heel 077 



Width of head , 022 



Habits and Habitat: The leopard frog is the best known of the 

 Ranidae, because of its great numbers and its habit of travelling 

 away from the ponds into the tields in search of food. Its green 

 coloring ])robably serves as a protection from its enemies. The 

 leopard frog also possesses the power of changing ihe ground color 

 to a limited degree to suit the surroundings. When kept in the lab 

 7 



