Rana clamitans 363 



mature tadpoles after June i are scarce. I am aware of Swingle's striking- 

 experiments with hastening transformation in this species, and am also fully 

 conscious this species has a longer growing period each year in the south than 

 in the north, but I nevertheless believe one year its normal tadpole life in the 

 Okefinokee region. 



TRANSFORMATION 



Period. In 191 2 the writer was in the swamp from May 28- July 4 and 

 the species was almost finished transforming by the later date. In 192 1 we 

 have definite records for April 27 and May 14. Our collections show 14 trans- 

 formed or recently transformed from April-August, 192 1. 



In 1922 we found on July 15 and July 17 some tadpoles with large hind 

 legs but they would not have transformed before August i or 10. One trans- 

 formed July 28. Most of the transformation comes in the spring and early 

 summer. Transformation stages were hard for us to find in the Okefinokee 

 Swamp after June 15 or July i. 



Size. At Ithaca the range of transformation size is generally 28-38 mm. 

 but many of those of the Okefinokee are smaller. In 191 2 on June 9 we found 

 some tadpoles one of which would have transformed in a week or ten days. It 

 was 23 mm. long without the tail. From May 28 to September a series of 

 frogs just transformed measured 25.5-33.5 rnni. 



In 192 1 on April 27 we visited a large cypress pond west of camp. In little 

 cut-off pools where there was little vegetation and mainly pine needles we 

 found two transformed green frogs, 23 and 25 mm. in length. Fourteen more 

 specimens collected from April-August, 192 1, measure 20, 21, 22, 22, 22, 22, 

 23, 24, 24, 24, 24, 25, 25, 28 mm. respectively. On May 14, 192 1, we took two 

 transformed frogs 21 mm. and 24 mm. in length. 



In 1922 on July 17 in one pond we found a few tadpoles nearing trans- 

 formation. One transformed July 29, 1922, at the small size of 20.5 mm. We 

 have a range of 20.5-33.5 mm., or probably with an average near 25 mm. or 

 at least 7 mm. smaller than the average transformed green frog of the North- 

 eastern States. 



General remarks. Possibly inasmuch as the adult of this species in the 

 Okefinokee region never attains the size of the northern representatives, we 

 have a smaller size at transformation as well. In any event both adult and 

 transformation sizes are smaller. The transformed frogs are easy to tell be- 

 cause of their prominent heavily spotted breasts. These numerous small 

 spots are grayish white. 



GROWTH 



Of 27 adults, 4 were from 52-58 mm., 16 were from 60-69 mm., and 7 

 from 70-79 mm. It must be rarely that Okefinokee representatives of this 

 species exceed 80 mm. in body length, yet northern forms may reach 100 mm. 

 The mean range of adults is between 60-70 mm. On June 12, 1912, we took 

 male frogs 52, 66, 67, 70, 72 mm. in length or on June 5, 1912, one 29 mm. and 

 a female 58 mm. Between May 28- June 25, 191 2, we found small frogs from 

 25-33 mm. in length. In the same period we took adults 52-75 mm. but none 

 in the gap of 34-51 mm. In 192 1 we secured only two in this intermediate 



