in fide: cf. Hor. Carm. 4.6.33 “Deliae tutela deae.”
[2] integri: modifying both nouns; so also in v. 3. cf. Catul. 61.36 “integrae virgines” ; Catul. 62.45 “virgo intacta” ; Hor. CS 6 “virgines lectas puerosque castos.”
[5] Latonia: Latona is often honored in hymns to her children; cf. Hor. Carm. 1.21.3ff. “[dicite] Latonam supremo dilectam penitus Iovi” ; Hor. 4.6.37 “rite Latonae puerum canentes.”
[7] Deliam: etc. for the story see Ov. Met. 6.333ff. (also Ov. Met. 13.634ff.).
[8] deposivit: one of the few archaic forms in Catullus; cf. Catul. 36.16 “face” ; Catul. 61.42n. citarier; Catul. 63.47, Catul. 63.52; Catul. 66.35 “tetuli” ; Catul. 44.19 “recepso” ; Catul. 66.28 “alis” ; Catul. 29.15 “alid” ; Catul. 66.37 “coetu” ; Catul. 17.17 “uni” ; Catul. 51.10 “suopte” .
[9-12] montium domina: etc. cf. Hor. Carm. 1.21.5ff. (which verses, however, these of Catullus far excel); Hor. Carm. 3.22.1 “montium custos nemorumque virgo” ; Hor. Carm. 4.6.33f.; Hor. CS 1 “silvarumque potens Diana” ; Hor. CS 69 “quaeque Aventinum tenet Algidumque.”
[13] Lucina: etc. cf. Hor. CS 13ff. “rite maturos aperire partus lenis, Ilithyia, tuere matres, sive tu Lucina probas vocari seu Genitalis” ; Hor. Carm. 3.22.2ff.
[14] Iuno: as the feminine counterpart of the Diespiter (Iuppiter Lucetius), who was worshipped in the mid-months, Juno was regarded as the deity who brought back the moonlight after its monthly eclipse, and so was worshipped on the Kalends as Lucina, the light-bringing. From this office she came to be regarded as a goddess of birth. The etymological connection of Juno and Diana suggests how naturally the latter, herself the moon-goddess, became identified with the former in other aspects also.
[15] potens Trivia: cf. Verg. A. 6.247 “Hecaten caeloque Ereboque potentem” ; Val. Flac. 3.321 “Triviae potentis occidit arcana genetrix absumpta sagitta.” —It is not strange to find Diana, as the moon-goddess, identified with Ἑκάτη Τριοδῖτις, the night-goddess (Lat. Trivia), as was also Proserpina, the goddess of the dark underworld.
[15] notho es dicta lumine Luna: i.e. she is called Luna from lumen, even though the light is not her own; cf. Hor. Carm. 4.6.38 “crescentem face Noctilucam” ; Hor. CS 35 “siderum regina bicornis, audi, Luna, puellas; ” Lucr. 5.575 “luna notho fertur loca lumine lustrans.” So Diana as the huntress and birth-helper, as Luna, and as Trivia (= Proserpina), is the threefold goddess; cf. Hor. Carm. 3.22.4 “diva triformis” ; Verg. A. 4.511 “tergeminam Hecaten, tria virginis ora Dianae.”
[17] cursu menstruo: etc. cf. Hor. Carm. 4.6.39ff. “prosperam frugum celeremque pronos volvere menses.”
[21] quocumque … nomine: cf. Hor. CS 15ff. (quoted on v. 13).
[22] Romuli: etc. cf. Hor. CS 47ff. “Romulae genti date remque prolemque et decus omne.” With the hypermeter cf. Catul. 64.298; Catul. 115.5; and Hor. l.c.