Reference edition:

Grammatici Latini, VII. Scriptores de orthographia. Terentius Scaurus Vellius Longus Caper Agroecius etc., ex recensione H. Keilii, Hildesheim 1961, 107-112 (reprografischer Nachdruck der Ausgabe Leipzig 1880).

Pseudo-Caper’s De orthographia is securely dated to the first half of the fifth century, while the dating of the short work De verbis dubiis is less certain. This latter work, which has didactic  leanings, takes on questions not only of an orthographical, but also of a lexical, morphological, and syntantic character. The lemmas, arranged in alphabetical order (which is not always rigidly adhered to: De Paolis 2013, Nota testuale), often seem to reflect late uses and linguistic phenomena (De Paolis 2014, 780-781); unlike the De orthographia, Greek glosses do not appear in De verbis dubiis, while it contains two etymologies of the erudite tradition (delerare ἀπὸ τοῦ λήρου, GLVII 100, 6; exenteravit ἀπὸ τῶν ἐντέρων, GL VII 109, 3), the first of which is also noted in Charisius (VII 4-5 Barwick and Velius Longus, p. 65, 22-24 Di Napoli), and which could also testify in support of the transmission in De verbis dubiis of genuine Caperian material (De Paolis 2013, Il progetto, 21, n. 23). It is not clear whether the two texts of Pseudo-Caper were united, together with Agroecius, in Gaul during the fifth century (hence the earliest archetype, as Schmidt claimed in 1997), or whether De verbis dubiis — which is absent in a good part of the most ancient tradition and in all of the Humanistic one — was added to the corpus at a later time, in any case prior to the ninth century, during which the earliest surviving codexes that preserved all three texts were produced (concerning the manuscript tradition of Pseudo-Caper, De Paolis 1995 e 2013-2014). [M. Callipo, tr. C. Belanger]