CONTENTS 



Introduction 



The region studied and the methods 



pursued 



A catalogue of the Ithacan Anura . . . 

 General account of the Ithacan 



Anura 



First appearance 



Mating 



Customary amplexation 



Cross-embraces 



Abnormal embraces 



Departures from the customary am- 

 plexation and their significance . 



Ovulation 



Eggs 



Key to the eggs of the Ithacan 

 Anura 



Hatching period 



Larval period 



Mature tadpoles 



Key to the tadpoles 



Transformation 



Affinities of our eight species 



Life-history of the American Toad, 



Bufo lentiginosus americanus . . . 



First appearance 



Voice 



Mating 



Ovulation 



Egg-laying process 



Eggs 



Hatching period . . . 



Mature tadpole 



Larval period 



Transformation 



Autumnal disappearance 



Life-history of the Peeper, Hyla 

 pickeringii 



First appearance 



Voice 



Mating 



Ovulation 



Egg-laying process 



Eggs 



Hatching period 



Mature tadpole 



Larval period 



Transformation 



Autumnal disappearance 



Life-history of the Tree-toad, Hyla 

 versicolor 



First appearance 



Voice 



Mating 



Ovulation 



Egg-laying process 



Eggs 



Hatching period 



Mature tadpole 



Larval period 



Transformation 



Autumnal disappearance 



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PAGE. 



Life-history of the Meadow-frog, Rana 



pipiens 52 



First appearance 52 



Voice 53 



Mating 54 



Ovulation 55 



Egg-laying process 57 



Eggs 57 



Hatching period 58 



Mature tadpole 58 



Larval period 59 



Transformation 59 



Autumnal disappearance 60 



Life-history of the Pickerel-frog, Rana 



palustris 61 



First appearance 61 



Voice 62 



Mating 62 



Ovulation 64 



Egg-laying process 65 



Eggs . 66 



Hatching period 67 



Mature tadpole 67 



Larval period 68 



Transformation 69 



Autumnal disappearance 69 



Life-history of the Green-frog, Rana 



clamata 70 



First appearance 70 



Voice 71 



Mating 71 



Ovulation 72 



Egg-laying promss 73 



Eggs 73 



Hatching period 75 



Mature tadpole 75 



Larval period 76 



Transformation 76 



Autumnal disappearance 76 



Life-history of the Bullfrog, Rana 



catesbeiana 77 



First appearance 77 



Voice 78 



Mating 79 



Ovulation 80 



Egg-laying process 81 



Eggs 82 



Hatching period 83 



Tadpoles 83-84 



Larval period 85 



Transformation 85 



Autumnal disappearance 86 



Life-history of the Wood-frog, Rana 



sylvatica 87 



First appearance 87 



Voice : 88 



Mating 89 



Ovulation 90 



Egg-laying process 92 



Eggs . 94 



Hatching period 95 



Mature tadpole 96 



Larval period 97 



Transformation 97 



Autumnal disappearance 98 



