It's definitely a pure americanus. Americans frequently have unmarked venters and middorsal stripes, at least west of the Appalachian divide. The shape of the parotoids, the arrangement of the cranial crests, and the presence of enlarged tibial warts are all classic americanus characteristics.

Bufo was split up in Frost et al's monumental 2006 paper on amphibian systematics; they divided the New World taxa into three genera. Anaxyrus includes most of the US species; Ollotis includes former B. nebulifer, B. alvarius, and most Mexican/Central American species; and Chaunus (since changed to Rhinella, which had precedence) contains B. marinus and other South American species. Both the SSAR and CNAH standard names lists have accepted these changes, though I'm sure C. King has not (j/k, C!).

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