LIST OF ILLUSTRATIONS 



(Plates mounted by A. A. Wright) 



1 92 1 photographs by F. Harper and the author. 



1922 photographs by F. Harper and A. A. Wright. 

 1923-29 photographs by A. A. and A. H. Wright. 



(Photographs developed and printed by Troy Studio 

 Engravings by The Hurst Engraving Co.) 



Plate I. Lateral aspects. Bufo, Gasirophryne, Pseudacris, Scaphiopus. 14 



1. Bufo americanus. 6. Gastrophryne carolinensis. 



2. Bufo fowleri. 7. Pseudacris ocularis. 



3. Bufo terrestris. 8. Pseudacris ornala. 



4. Scaphiopus holbrookii. 9. Pseudacris nigrita. 



5. Bufo quercicus. 



Plate II. Lateral aspects. 



1. Acris gryllus. 



2. H])la crucifer. 



3. Hyla andersonii. 



4. Hyla gratiosa. 



5. Hyla cinerea. 



Hyla and Acris 



6. Hyla evittata. 



7. Hyla squirella. 



8. Hyla femoralis. 



9. Hyla versicolor. 

 10. Hyla avivoca. 



Plate III. Lateral aspects. 



1. Rana septentrionalis. 



2. Rana clamitans. 



3. Rana virgatipes. 



4. Rana heckscheri. 



Rana males 



5. Rana aesopus. 



Rana pipiens. 

 Rana sphenocephala. 

 Rana grylio. 



Plate IV. Amplexation 



Normal types. 



1. Pectoral. Ranidae. Rana pipiens. 



2. Inguinal. Scaphiopodidae. Scaphiopus holbrookii. 



3. Axillary. Hylidae. Hyla versicolor. 



4. Axillary. Brevicipitidae. Gastrophryne carolinensis. 



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Abnormal types. 



5. Preaxillary. Gastrophryne carolinensis. 



6. Multiple amplexation. Pseudacris ocularis. 



7. Cross-embrace. Bufo valliceps and Rana pipiens. 



8. Two males in embrace. Hyla versicolor. 



Plate V. Normal embraces. 



30 



1. Hyla cinerea. Axillary. 7. 



2. Hyla femoralis. Axillary. 8. 



3. Hyla gratiosa. Axillary. 9. 



4. Hyla squirella. Axillary. 10. 



5. Acris gryllus. Axillary. 11. 



6. Pseudacris ocidaris. Axillary. 12. 



Bufo quercicus. Axillary, 

 Bufo terrestris. Axillary. 

 Gastrophrijne carolinensis. Axillary. 

 Bufo fowleri. Axillary. 

 Rana clamitans. P^ectoral. 

 Rana sphenocephala. Pectoral. 



Plate VI. Egg masses. 



1. Acris gryllus. 



2. Scaphiopus holbrookii. 



Gastrophryne carolinensis. 

 Pseudacris ocidaris. 



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