Rana clamUans 355 



I.I I in hind foot; i. 27-1. 03-1. 17-1. 16 in tibia; i. 36-1. 03-1. 17-1. 25 in fore- 

 limb; fifth toe 1. 57-1. 46-1. 3-1. 48 in fourth toe; internasal width i. 0-1.33- 

 1. 42-1. 57 in first toe; 1.57-2.0-2.57-2.7 in second toe; 2.28-3.0-3.14-3.85 in 

 third toe; 3. 14-5.0-5.0-6. 14 in fourth toe; 2.0-3.4-3.85-4.14 in fifth toe. 



HABITAT 



Suitable ponds whether on the higher banks of St. Mary's River under 

 oaks or in overflow and cutoff pools with river swamp flora (Thompson's 

 Landing) , or whether they be the fringe of cypress and gums of a cypress pond 

 (Long Pond) or roadside ponds, sphagneous (Spanish Creek Woods) or not or 

 ponds in hammocks (Billy's Island) — all are used. The factors of pond and 

 shade both seem to enter. They were most abundant in chorus in the island 

 edges of the cypress bays or their counterparts, the fringe of trees around a 

 cypress pond. We also found them in the "dreens" (Cypress Bay) between 

 Chesser Island and the mainland. 



In our experience with this species it is neither common within the swamp 

 nor outside the swamp. Probably it is easier of observation in ponds outside 

 the swamp or on the swamp's border but we are not prepared therefore to 

 say it is more common outside the swamp. 



FIRST APPEARANCE 



The earliest record we have is April 28, 192 1, but it must appear earlier. 



GENERAL HABITS 



In 191 2 we made the following observations regarding their general habits: 

 "Its habits in the swamp quite generally agreed with its known habits else- 

 where. It was found both outside and inside the swamp. All our captures 

 were from ponds and its tadpoles were found in the more permanent ponds or 

 swamp's cypress thickets on the islands. We seldom saw it on the prairies or 

 along the cypress runs where the common form was Rana grylio." 



VOICE 



The voice of the green frog is quite generally known to naturaHsts. Miss 

 Dickerson (1906, p. 199) says "it is explosive, prolonged, and low-pitched and 

 is likely to be repeated five or six times in succession. When we hear it given 

 with less than its usual force, we may be deceived into thinking that we hear 

 the drumming of a woodpecker. It may be imitated very well by cutting on 

 a table, with heavy shears, some kind of coarse resisting cloth. Or it may be 

 imitated less well by tearing heavy cloth in a jerky fashion. It resembles the 

 croaking of the Pickerel Frog, but has more strongly accentuated notes in it." 



"The explosive character of the sound will be better understood from 

 watching the frog when he is croaking. He works hard; there is no appearance 

 of external vocal pouches (as in the Leopard Frog, Fig. 9), but the yellow 

 throat and the sides expand with such force as to jerk the whole body forward. 



