Quite interesting case,
C.E. Valerio erroneously considered Brachypelma and Sericopelma to be feminines, but they are neuters (like all other genera with -pelma ending). So he described species like Brachypelma albopilosa, Brachypelma fossoria, Sericopelma ferruginea or Sericopelma immensa. As these examples are adjectives, they were simply changed by later authors to fit genus name. Problem arises when origin and category of name is unclear, like generala. Someone thought it is adjective too, so they tried to correct it, creating a bit mess.
BTW does anybody here have access to original article through WSC ?