The Virbius in the text is the son of this Hippolytus, also called Virbius.
CVI.

Io, the daughter of Inachus, king of Argos, was loved by Jupiter, and turned by him into a white cow in order to escape the jealousy of Juno.

The latter, however, set Argus with the hundred eyes to watch her.
NOTES TO BOOK EIGHT I.Both here and in Book VII.

stanza lxxxvii.

Mezentius is called the 'scorner of the gods.' The meaning of this allusion is not known.
Perhaps it refers to his claiming for himself the first-fruits due to the gods, a legend mentioned by Macrobius.