AMPHIBIANS. 47 



isolated call may be heard all snininer. The song resembles the 

 chirping- of a cricket, hence the common name, cricket frog. The 

 eggs are laid in April or May. The deyelopment is rather slo\yer 

 than that of the rest of the Hylidae. Miss Dickerson has fonnd 

 the tadpoles in the water in August and thinks that metamorphosis 

 takes place in Sej)tember. 



Distribution: New York to Florida, \yest to Texas. (Dickerson. 

 1906.) 



Michigan : Specimens in the Uniyersity Museum from Cheboy- 

 gan, Livingston, Washtenaw, Calhoun, Allegan and St. Joseph 

 Counties. Reported from Eaton County (Clark, 1902) ; Antrim and 

 Eaton Counties (Gibbs, Notestein and Clark, 1905) ; Cass County 

 (Thompson, 1911). 



CHOKOPHILUS NIGRITUS (L.e Conte). 



SWAMP TREE FROO. 

 (PI. IV a.) 



Description: Body frog like. Head long and pointed; upper jaw 

 protruding. Eyes prominent. Toes slightly webbed; disks small, 

 hardly noticeable. A conspicuous fold across chest. Skin granu- 

 lated on back and lower surface. Yomero-palatine teeth near the 

 I)OSterior part of internal nares. Tongue medium in size. 



Ground color changeable, varying from light to dark brown. A 

 dark stripe begins at the snout and runs back through the eye to 

 the posterior part of the body. Upper lip with a light stripe and 

 bordered with dark. Usually three dark longitudinal stripes on the 

 Ijack; center stripe on the vertebral line and sometimes forking 

 posteriorly and behind the eyes. Limbs indistinctly barred or 

 spotted. Under surface yellowish white. Throat of male yelh)w. 



Measurements: Specimen No. 31921. 



Ticngth of head and body 017 



Length of hind limb to heel 015 



Width of head OOG 



Hah its and Hahitat: The swamp tree frog is found in marshes 

 and damp jdaces throughout the summer and fall. During this 

 time it is solitary and its call is rarely heard. It is also seldom 

 seen because of the small size and protective coloration. When dis- 

 turbed it disappears in the water, but it is a very poor swinuner 



