custos ille Cretum: i.e. the bronze giant Talus, devised by Daedalus and made by Hephaestus for King Minos, who strode from headland to headland, making the circuit of the island thrice daily; cf. Apoll. Rh. 4.1638ff.; Apollod. 220.127.116.11ff.
 Ladas: Pausanias mentions by this name two victors in the Olympic foot-races, one of Sparta, and the other, less famous, an Achaean (Paus. 3.21.1; Paus. 10.23.14); cf. Mart. 10.100.5 “habeas licebit alterum pedem Ladae” ; Juv. 13.96 “pauper locupletem optare podagram nec dubitet Ladas” . There is a manifest anacoluthon; the idea of v. 1 si fingar is the one in mind.
 pinnipes Perseus: in order to attack Medusa in safety, Perseus had borrowed of the Nymphs the winged shoes like those of Hermes as well as Pluto's helmet of invisibility and the magic wallet; see Apollod. 2.4.2. Cf. Prop. 3.30.3 “non si Pegaseo vecteris in aere dorso, nec tibi si Persei moverit ala pedes. pinnipes” is ἅπαξ λεγόμενον.
 Rhesi: Rhesus was the king of Thrace whose famous horses Ulysses and Diomed stole on the night of his arrival to help the Trojans; cf. Hom. Il. 10.438ff.; Ov. Met. 13.249ff. There is a similar anacoluthon to that in v. 3; si ferar fills out the idea.
 plumipedes: ἅπαξ λεγόμενον; the reference is clearly not to flying men like Daedalus and the sons of Boreas (for Perseus in v. 3 is a type of such swiftness), but to birds, thus interposed between horses and winds.
 volatiles: carrying further the picture in the preceding adjective; feather-footed (Ben Jonson) and flying fowl.
 vinctos: with reference to the story of Aeolus and Ulysses (cf. Hom. Od. 10.17ff.); the idea being only that if he were by their master put in possession of the winds to rule them at his pleasure, their unwearied swiftness would not suffice him.
 defessus omnibus medulus: cf. Pl. Stich. 340 “at ego perii, quoi medullam lassitudo perbibit” . With defessus … quaeritando cf. Pl. Amph. 1014 “sum defessus quaeritando, nusquam invenio Naucratem.”