Citazioni letterarie e contesto grammaticale nei libri dell'Ars sul pronome

I analyze two passages of the Ars Prisciani from the books on the pronoun (XII and XIII) in which the relationship between a citation and its grammatical context is problematic. Frg. Coel. hist. 37 Peter is cited in four passages of the Ars: three times including the words "alius modi", once with "alii modi". I propose to print "alius modi" in the editions of Coelius Antipater, but I argue that the only occurrence of the fragment with "alii modi" is due to an authorial error. I then discuss Plin. Dubius sermo frg. 7, in which a verbatim citation is wrongly attributed to Cicero's Orator.  I discuss the possible origin of this confusion and conclude that this is another authorial error, that likely originated through an intermediate grammatical source of Priscian, possibly Caper.