The Collaborative International Dictionary of English v.0.48:

Lithosian \Li*tho"sian\, n. [From NL. Lithosia, the typical
   genus, fr. Gr. li`qos a stone, a rock.] (Zool.)
   Any one of various species of moths belonging to the family
   Lithosid[ae]. Many of them are beautifully colored.
   [1913 Webster]