“
In the classical era, the Lar was duplicated and the Lares became rather confused, or at least associated, with the Penates, who appear in the lararia of Pompeii in the form of gods for whom the master of the house had a fondness. As for the two Lares, they are shown as two young people, their heads crowned with flowers, pouring the contents of a rhyton into a situla or libation patera. They flank Vesta or the domestic 'Genius' or spirit, thus setting an example of sacrificial piety. They are also to be found in the company of Mercury, Venus, Bacchus or other deities dear to the paterfamilias. The one or two snakes associated with the Genius, or shown below the Lares (sometimes entwined around the altar where the Genius sacrifices) appear to be the guardians of the place as well as an expression of the vital, if not genetic, force of the family. When Aeneas pays homage to the Manes of his father (Virg., Aen., 5, 84 ff.), a serpent appears and, slithering among the paterae and vessels, 'tastes the sacred food
”
”
Robert Turcan (The Gods of Ancient Rome: Religion in Everyday Life from Archaic to Imperial Times)