THE KEPHISIDES (or Cephisides) were the Naiad Nymphs of the River Kephisos (Cephisus) in Boiotia (central Greece).

Pindar, Pythian Ode 12 str 4 (trans. Conway) (Greek lyric C5th B.C.) :
"The Kharites's (Graces') city, home of lovely dances [Orkhomenos], where the Nymphe, daughter of Kephissos [the River Cephisus], has her precinct."

Corinna, Fragment 655 (trans. Campbell, Vol. Greek Lyric IV) (C5th B.C.) :
"Women of Tanagra . . . often I adorned [with songs] our ancestor Kephisos [the River Cephisus] with my words, often great Orion and the fifty sons of high strength whom he fathered by intercourse with the fair Nymphai [the Kephisides]."

Ovid, Metamorphoses 3. 505 ff (trans. Melville) (Roman epic C1st B.C. to C1st A.D.) :
"On the green grass he [Narkissos, Narcissus] drooped his weary head, and those bright eyes that loved their master's beauty closed in death . . . His sister Naides wailed and sheared their locks in mourning for their brother; the Dryades too wailed and sad Echo wailed in answering woe. And then the brandished torches, bier and pyre were ready--but no body anywhere; and in its stead they found a flower - behold, white petals clustered round a cup of gold!"

Sources:

• Pindar, Odes - Greek Lyric C5th BC
• Greek Lyric IV Corinna, Fragments - Greek Lyric C5th BC
• Ovid, Metamorphoses - Latin Epic C1st BC - C1st AD