330 HAROLD CUMMINS 



pond after 8 p.m. At 12:30 p.m., two clasping pairs; at 1:30 p.m., 

 three females; at 3 p.m., one clasping pair, and at 4 p.m. one male, all 

 leopard frogs, were captured in the pond. At 3 p.m., one male wood 

 frog was caught. 



March 30th. No croaking occurred during the preceding night and 

 none was heard until 9 p.m. of March 30th, when the calls of the leopard 

 frog began. In the morning a number of leopard frogs were seen in 

 the water, none of them except one clasping pair being taken. One 

 female wood frog was seen. 



March 31st. Great numbers of unpaired wood frogs and clasping 

 leopard frogs were noted in the pond in the afternoon. The voices of 

 R. pipiens were first heard at 9:30 a.m.; from that time and through the 

 night their voices were heard. Beginning at 10 a.m., the swamp tree 

 frogs began to croak in numbers, and in the evening the voices of the 

 spring peeper and the wood frog were added to the chorus. At 9 

 p.m. all four species were found at the edge of the water. The light of 

 the lantern dazed them, for, while continuing their calls, they did not 

 jump readily when disturbed. 



April 1st. The chorus of the preceding night continued all morn- 

 ing. Several clasping pairs of the leopard frog were noted in the 

 water. 



April 2nd. A few swamp tree frogs croaked all day. 



April 3rd. No croaking was heard until evening, when the swamp 

 tree frog and the spring peeper began. 



The numerous frogs which appeared in the pond either had 

 hibernated therein or had evaded the trap. Both sources might 

 have furnished individuals, the latter being possible for two 

 reasons. All species could have entered where the fence was 

 not continuous, and the spring peeper, also perhaps the swamp 

 tree frog, could have adhered to the fence and climbed over. 

 It is unlikely that the leopard frog and wood frog could have 

 done this, for experiments demonstrated the effectiveness of the 

 fence as a barrier for these species. 



With the exception of three examples, all trapped frogs were 

 adult and sexually mature. These instances were excluded 

 from the records of the trap, to be recorded separately. On 

 March 29th an immature leopard frog was trapped, on April 2nd 

 an immature wood frog, and on April 16th an immature wood 

 frog. Unfortunately, no examinations of the reproductive organs 

 were made for the determination of sex, but the three were so 

 small that they could not have been sexually mature. 



