Ralph Steele Boggs, Index of Spanish Folktales (1930)
“ Usually whenever a story, a line of action or motivation occurs in a riddle, this story is a folktale. Louseskin (Mt 621) represents the typical riddle tale. This fusion with other types of the folktale, itself a type not well defined, illustrates, with the vague distinction between "literary" texts and texts of "scientific" value, the extreme difficulty of defining folktale material. A definition of "Spanish" is necessary. The science of folklore is not yet far enough advanced to define what is folkloristically Spanish. ”
