Spotless grass yellow (Eurema laeta laeta)

Rather uncommon butterfly, found all the year round in patana grasslands of mid hills (500ft to 3000ft).Spotless grass yellow is a migratory species and its larva feeds on Chamaecrista leschenaultiana, Chamaecrista kleinii , Chamaecrista mimosoides and Chamaecrista nictitans (All Chamaecrista species are known as බිං සියඹලා in Sinhala)