Contents 



PART I. PAPERS ON TAXONOMY 



I. The Identification of Salientia in Oklahoma Arthur N. Bragg 9 

 Keys to Frogs and Toads of Oklahoma Arthur N. Bragg 11 



II. A Key to the Adult Salamanders of Oklahoma, Including the 

 Forms Likely to Occur in the State 



Harold A. Dundee and Arthur N. Bragg 30 



III. Salientian Breeding Dates in Oklahoma Arthur N. Bragg 35 



IV. Salientian Range Extensions in Oklahoma and a New State 



Record Arthur N. Bragg 39 



PART II. PAPERS ON ECOLOGY 



V. Observations on the Ecology and Natural History of Anura. 

 XIV. Growth Rates and Age at Sexual Maturity of Bufo 

 Cognatus under Natural Conditions in Central Oklahoma 



Arthur N. Bragg and A. O. Weese 47 



VI. Observations on the Ecology and Natural History of Anura. 

 XVII. Adaptations and Distribution in Accordance with 

 Habits in Oklahoma Arthur N. Bragg 59 



VII. Some Adaptations of Survival Value in Spadefoot Toads 



Arthur N.Bragg 101 



VIII. Frequency of Sex Calls in Salientia Arthur N. Bragg 117 



PART III. PAPERS ON SEX CYCLES 



IX. The Annual Ovarian Cycle of Aeris Crepitans Baird 



Helen Talley Fisher and .1. Richards 129 



X. A Comparison of the Ovaries of Two Species of Bufo with 

 Different Ecological Requirements 



Carol Bergthold Clarl^ and Arthur N. Bragg 142 



64:60 1 



