Species within the genus Eurema (Grass Yellows) range from Asia, Africa, Australia, and Oceania, to the Americas.
The Grass Yellows are generally weak flyers, fluttering low around bushes and flowers.
At least 71 species are currently known. 
They are generally difficult to tell apart and what makes it even more difficult is that the sexes often differ slightly and there are different seasonal forms (wet and dry season forms).
The main differences between the species are:
a) the number of black spots on the underside of the forewing, combined with
b) the shape of the (apical) black markings on the upperside of the forewing and
c) the shape of the apical area markings on the underside of the forewing.

Eurema blanda (sometimes also called Three-spot Grass Yellow) looks very similar to the Eurema hecabe (sometimes also called Common Grass Yellow).
The difference, however, is on the underside of the forewing.
In Eurema blanda there are three small spots and a fourth bigger one in the middle of the wing; in Eurema hecabe there are two small spots and one bigger spot in the middle of the wing.

This is the subspecies Eurema blanda blanda.

Ubud, Bali, Indonesia, 14 October 2011