KARYSTOS (or Carystus) was a rustic demi-god native to the island of Euboia in central Greece. In the local mythology he was the father of the shepherd-god Aristaios, foster-father of Dionysos. He also gave his name to the southern Euboian town of Karystos.

Bacchylides, Fragment 45 (from Scholiast on Apollonius of Rhodes) (trans. Campbell, Vol. Greek Lyric IV) (Greek lyric C5th B.C.) :
"Some authorities give the parentage of four gods called Aristaios (Aristaeus), as Bakkhylides does : one the son of Karystos (Carystus), another the son of Khiron (Chiron), another the son of Ge (Earth) and Ouranos (Sky), and the son of Kyrene (Cyrene)."

NOTES:
In Bacchylides' description, there appear to be two Aristaioses--the first and third are the Euboian Titan-god [i.e. Hesiod's Astraios], the second and fourth are the Thessalian rustic-god [i.e. the god usually described as a son of Apollon].
Karystos may have been identified with the Euboian demi-god Sokos father of the Euboian Korybantes (whose number included the Aristaios-like Kourete Melisseus). He may also have been associated with the Titan Krios (literally the "Ram"), father of the Aristaios-like Titan Astraios. Forms of the words sokos-karystos-krios were all used as epithets of Hermes--"the strong one," "the herald," "the ram-"bearer. Karystos, literally "the herald", might be the Euboian Hermes.

Sources:

• Greek Lyric IV Bacchylides, Fragments - Greek Lyric C5th B.C.

Other references not currently quoted here: Eustathius on Homer's Iliad 281; Scholiast on Pindar's Pythian 4.181