Source : Webster's Revised Unabridged Dictionary (1913)

Festucine \Fes*tu*cine\ (? or ?), a. [L. festula stalk, straw.
   Cf. {Fescue}.]
   Of a straw color; greenish yellow. [Obs.]

         A little insect of a festucine or pale green. --Sir T.
                                                  Browne.