The name pseudo-Hyginus is used to identify the author of a work on military science entitled De metatione castrorum. The text’s first editors (Scriverius, Schele, Lange) attributed it to Hyginus, the geometer active during the age of Trajan, since it was transmitted together with that author’s works in the 6th c. codex Arcerianus Guelferbytanus 36.23 Aug. 2º (A), ff. 126vb, 1.15-137 va. Persuasive arguments have been advanced, however, that this identification cannot be correct (Gemoll, Thulin). Grillone highlights that two passages in chapter 45 (In quantum potui, domine frater, pro tirocinio meo in breui omnes auctores sum persecutus, sed quidquid circa compositionem castrorum aestiualium instituerunt, in hoc libello, priusquam numeros instituerem, sub ratione omnia declaraui) and 47 ([...] nouitatem metationis ad magnitudinem tuam primus adferam, quae tibi spero placebit, si primum cottidianam metationem tractabis) may be helpful to outline the personality and intent of the author: they show that the work’s author was serious, competent, and had much practical experience, and also that his short work was composed to offer useful suggestions to those who oversaw the surveying of military camps (i.e. gromatics) on a daily basis. Grillone also notes that the use of the ablative absolute and subjunctive in the hypothetical period show that its author had access to a grammatical institutio. [B. Strona; tr. C. L. Caterine].