174 Frogs of the Okefinokee Swamp 



Many remark the difference in the throat of the two sexes. ElHs (19 13, 

 p. 58) holds "its voice being powerful because of the gular sac." 



On Apr. 25, 192 1, a pair were captured. Of it we record that "At night 

 the Ac7Hs look all faded out including femoral stripes." "Male, orange 

 yellow throat with white and dusky flecks. Forelimbs of male look slightly 

 larger proportionally than those in the female. Often male may be green on 

 back except for cords on back." On May 15, 192 1 we write "The Acris males 

 have the orange throat; this orange color extends to the brachium. Some- 

 times the skin on the brachium is papillose or raised up into little processes." 



The measurements of loi adults from Okefinokee Swamp, i.e., 55 males 

 and 46 females yield the following results: males range from 15-24.5 mm., 

 mode 18 mm., average 18 mm. ; females, range from 15-24 mm., mode 21 mm. ; 

 average 19 mm. A study of the modes reveal that the males are at 18 mm. 

 and the females at 21 mm. There are four doubtful external determinations 

 of males from 15-17.5 mm. and of females four such determinations. At 

 15 mm., however, there are two certain males and one female; at 16 mm. 10 

 certain males and no females, at 17 mm., 8 certain males and 6 positive 

 females. The range of 15-17 mm. is the uncertain overlap of transformation 

 size with the beginning of maturing breeding frogs. 



In a group of adult Acris collected from New Orleans by Dr. R. W. 

 Shufeldt (U. S. N. Museum No. 13270) the 22 males ranged from 19-22 mm., 

 the modes 20 and 22 mm., average 21 mm., the 30 females were from 16-26 

 mm., the modes 22 and 23 mm., average 22 mm. The modes and averages for 

 males and females were higher than those of Okefinokee. 



A collection made at Ames, Iowa, June 12, 1924, by Drs. E. L. and K. V. 

 (Katherine VanAVinkle) Palmer give a higher modal and average size. The 

 twenty-two adults were taken from a breeding congress, 18 males and 4 

 females. The males range from 21-29 mm., mode 25 mm., average 25 mm., 

 and the four females ranges from 27-29 mm., average 28 mm. 



The measurements for 169 adults from various parts of Acris' s range, 

 i.e., 100 females and 69 males gives: females range from 16-33 mm., modes 

 22, 24, and 28 mm. average, 23.5 mm.; males range from 17-29 mm., modes 

 20, 22 and 25 mm., average, 22 mm. 



Compared to this composite series the Okefinokee males have their range 

 and mode 2 mm. lower, and their average 4 mm. lower; the females their 

 range and mode i mm. lower and their average 2.25 lower. 



Many queries arise: Do the 13.5, 14, 14.5, 15 mm. transforming individuals 

 becomes sexually mature at once or are the debatable and positive 1 5-1 7.5 mm. 

 cTs from frogs which transformed at 9-12 mm.? Are all the adults from 15- 

 24.5 mm. (the largest) one-year-olds when breeding or is less than a year 

 needed for maturity? 



At 15 mm. some males and females are not determinable externally. 

 An analysis of a group of 30 frogs we took from Apr. 25-May 3 follows. These 

 sex identifications are on external characters alone. 



13 mm. not at transformation; 15 mm., possibly male; 15.5 mm., is it a 

 female? 15.5 mm., is it a male? 16 mm. male two central plaits, throat yel- 



