In 1938, Taylor (1938,513) for the first time pointed out the existence of two distinct forms of toads in the assemblage previously referred to Bufo debilis. These he designated as the species Bufo insidior Girard and Bufo debilis Girard. Since then much confusion has reigned, especially with respect to the range and status of the southeasterly form regarded as B. debilis.
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Sanders, Ottys and Smith, Hobart M.
"Geographic Variation in Toads of the debilis Group of Bufo,"
Field and Laboratory: Vol. 19
Available at: https://scholar.smu.edu/fieldandlab/vol19/iss4/1