Lewis Short
Psylli (noun M) : Ψύλλοι
* An African people south-west of the Syrtis Major, celebrated as serpent-charmers: qui Psylli nominantur,Cels. 5, 27, 3; Plin. 7, 2, 2, § 14; 8, 25, 38, § 93; Suet. Aug. 17; Luc. 9, 893.—Sing.: exemplum Psylli secutus,Cels. 5, 27, 3.
Charlton T. Lewis, Charles Short, A Latin Dictionary