List of Illustrations xiii 



Hyla femoralis. lo. Gastrophrtjne carolinensis. 



Hyla gratiosa. ii. Bufo terrestris. 



Hyla sqtdrella. 12. Bufo quercicus. 



Hyla versicolor. 13-16. Typical series, tadpole to trans- 

 oms gryllus. formed frog. Hyla gratiosa. 



Plate XVI. Transformed frogs (Ranas) 62 



1. Rana virgatipes. 6. Rana grylio. 



2. Rana aesopus. 7. Rana sphenocephala. 



3. Rana grylio. 8. Rana sphenocephala. 



4. Rana clamitans. g. Rana septentrionalis. 



5. Rana clamitans. 10. Rana septentrionalis. 



Plate XVII. Chart of growth 62 



Transformation sizes in comparison with greatest mature sizes of males and 

 females of twenty species. 



Plate XVIII. Spade-foot {Scaphiopus holbrookii) 78 



1. Male and female. Dorsal. 4. Male. Lateral. 



2. Male and female. Ventral. 5. Egg masses. 



3. Adult. Lateral. 6. Eggs, stained. 



Plate XIX. Spade-foot {Scaphiopus holbrookii) 94 



I. Habitat. 6.7. Tadpoles. 



2.3.4. Males croaking. 8.9.10.11. Tadpoles and transforming 



5. Eggs. frogs. 



Plate XX. Oak toaj) {Bufo quercicus) no 



I. Habitat. 6. On sand. 



2-5. Males croaking. 7. Egg string. 



Plate XXI. Oak toad {Biifo quercicus) 126 



I. Habitat. 6. Egg bars, stained. 



2.3. Toads in daytime retreats. 7.8.9. Tadpoles. 



4. Female and male. Ventral. 10. Transformed toad. 



5. Clusters of egg bars. 



Plate XXII. Southern toad {Bufo terrestris) 142 



1. Habitat. 8.9. Tadpoles. 



2. Female and male. Ventral. lo.ii. Transformed toads. 



3.4.5. Males croaking. 12. Egg strings, stained. 



6. Male and two females. Lateral. 



7. Biifo quercicus and Btifo terrestris compared. 



Plate XXIII. Cricket-frog {Acris gryllus) 158 



I. Habitat. Chase Prairie. 8.9.10. Males croaking. 



2.3. Tadpoles. 11. Eggs. 



4. Tadpoles with four legs. 12. Tadpoles with two legs. 



5.6. Transforming and transformed frogs. 



7. Two males and two females. Ventral. 



Plate XXIV. Black chorus frog {Pseudacris ocularis). .... 206 



I. Habitat. Saddlebag Pond. 8. Tadpole with short tail. 



2.3. Males, croaking. 9. Transformed frog. 



4.5 Mature tadpoles. 10. Male croaking. 



6. Tadpole with two legs. 11. Habitat, near Siren Run. 



7. Tadpole with four legs. 12. Male croaking. 



