4SO Frogs of the Okefinokee Swamp 



55, 55 mm. Early in the spring of 1905, April 23, T. D. Keim and H. W. 

 Fowler secured a large series at Great Egg Harbor River above May's Land- 

 ing, N, J. Twenty of them measure as follows: 39, 40, 42, 44, 44, 45, 45, 45, 

 45, 46, 48, 48, 49, 49, 49, 51, 51, 52, 52, 52, 53, 54, 55, 58 mm., the last two 

 females. Two specimens taken in summer on May 31, 1905 and June 20, 

 1901 were 45 and 50 mm. The fall (Oct. 189 1) group of Cope may show three 

 sizes: 31-35, 49, and 55; the early spring collection of Keim and Fowler 

 apparently fall into two groups: 39-49, 51-58. Or this material might be 

 interpreted as of two groups — the fall collection 31-35, 49-55; the spring 

 39-49, 51-58; the summer of two, 45 and 50. This would make half year olds 

 or less 31-35, year olds or less 39-49 and two year olds 49-58. Growth con- 

 ditions vary in N, J. and Ga. no doubt as does growth in bullfrogs in N. Y. 

 and La. (vide Viosca). 



In the Museum of Comparative Zoology are the following: 



3483 Lakehurst, N. J., W. T. Davis, 1905. 34 mm 



2542 Lake Ellis, N. C, C. S. Brimley, May 24, 1907 37 



2519 " " " " " " " " " " 36 



2542 " " " " " " " " " " 34 



3518 " " " " " " " " " " 42 



712 Beaufort, N. C, J. G. Shute 1863 60 

 3560-68 Lakehurst, N. J., T. & F. K. Barbour, July 1914 



35, 36 mm. past transformation 



36.5, 40, 42 mm. 



48 mm., 56, 66 mm. 



Possibly these big representatives, 60 mm. and 66 mm. represent 4 year olds. 



FOOD 



Davis noted (1907, pp. 50, 51) that "These frogs domineer over one an- 

 other to some extent, and when insects were placed in the cage as food, it was 

 common for the more active individual, faihng in the attempt to catch a fly, 

 to turn on his companion and butt him until he retreated into the pool or 

 into a corner. The butted individual would hold his head down in the meekest 

 manner, and he became so cowed that if I touched him at any time with my 

 finger, he assumed the humble position. Miss Dickerson in The Frog Book 

 says that Rana pipiens and Rajia onca will snap at the head of a companion 

 frog that has taken a worm that he was trying to capture, but she thinks it is 

 probably not an exhibition of anger, but a desire to secure the disappearing 

 worm. However this may be, it is certain that the butting Rana virgatipes 

 in the above-mentioned case secured a great advantage over the other frog, 

 for after 'settling' his companion, he captured all of the insects." 



ENEMIES 



Every associate in the Okefinokee swamp and also at Lakehurst, N. J., if 

 large enough might feed on them. At Lakehurst, N. J., one of their worst 

 enemies is the water snake {Natrix sipedon sipedon). We saw several in the 

 sphagnum mat around the large lake. One specimen from Lakehurst had the 

 left arm from elbow down sharply cut off. 



