THE AMPHIBIA OF OKLAHOMA 



miles north of West Main Street and on Berry Road, which served as 

 a breeding site.^ 



Ai. South of 0.2 miles from Robinson Street along Berry Road (i.e., approxi- 

 mately 1 mile south of A) and east along Robinson 0.2 miles from the 

 corner. 



Ao. Toads collected on 0.8 mile of Berry Road from Main Street north were 

 assumed to have been produced at a breeding site in a pasture northwest 

 of this corner. Toads collected from Aj could have been from either 

 breeding site. 



B. Polo Field south of the University of Oklahoma campus — now part of 



the South Campus of the University and adjacent thereto on the north. 

 Until 1942 this area served as principal breeding site for B. cognatus in 

 this region and had been watched closely for several years. Toads of sev- 

 eral ages were found here in May and June, 1941, coming from breeding 

 congresses at different times during the spring. 



C. Along Lindsey Road for 0.8 mile west from its junction with Berry Road 



1.0 mile south of Main Street. The breeding site or sites near here in 

 1941 were unknown but young toads are always abundant whenever 

 found anywhere about Norman. 



D. On Berry Road just south of Main Street. Breeding site in pasture some 



0.1 to 0.2 mile froni corner. This is so near the site mentioned in Ai> that 

 mixing of the toads from the two sites is probable. 



E. Along West Boyd in the second half mile from Berry Road intersection. 



Breeding site here is unknown. This is approximately 0.8 mile across 

 agricultural land from Main and Berry and approximately 0.5 mile from 

 the west half of the section of W. Lindsey Road mentioned under C. 

 The first young toads to emerge in the spring of 1939 appeared on the 

 evening of April 14. The season was very dry and individuals were not found 

 feeding until after showers on May 10 and 13. Many were out on May 17. 

 Adult males were calling but the young males, which probably had meta- 

 morphosed the preceding year but may have been older, failed to enter the 

 breeding pools. Young females picked up from the grass adjacent to breeding 

 pools and offered to calling males were clasped by them but struggled in a 

 continuous attempt to escape. Apparently, young toads of neither sex were 

 sufficiently mature to breed. 



On the night of June 6, twenty-six young toads collected from Station A2 

 ranged in length between 51 and 67 mm. None of these had developed the 

 secondary sex characters of the male (they were presumably females), but six 

 days later ninety-nine, of which seventeen were juvenile males, were collected. 

 The juvenile males ranged between 51 and 75 mm. in length. Many adults 

 in the roads with them were no larger than the largest of the juveniles. Thus 

 a few males metamorphosing in the spring of 1938 had now reached a size 



^ This is now no longer available as such, due to the construction of the naval air 

 training base during the war. The site is now locatetl on the eastern edge of the North 

 Campus of the University of Oklahoma and its character is completely changed. B. cognatus 

 bred on the North Campus in 1947 but did not use this site. 



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