Thriae

In Greek mythology, the Thriae ("pebbles") were three virgin sisters. They were nature goddesses who were able to see the future (a trick learned from Hermes) and interpret the signs of nature and omens (such as tossing pebbles, the source of their name). They lived near Mt. Parnassus.

In art, they were old, winged and silver-haired (covered in white flour). They bear a resemblance to bees covered with pollen.

Alternative: Thriai