Eurema laeta (Sulphur sp.)

Description:

Species within the genus Eurema range from Asia, Africa, Australia, and Oceania, to the Americas. 
At least 71 species are currently known. 
The main differences between the species are:
a) the number of spots in the underside forewing cell, combined with
b) the shape of the upperside forewing black markings and
c) the shape of the apical area markings on the forewing underside. 

There are 5 species within the genus Eurema in Japan: Eurema blanda, Eurema brigitta, Eurema hecabe, Eurema mandarina and Eurema laeta.
The butterfly on the photo hardly shows any spots on the underside of its forewing making it Eurema laeta, sometimes also refered to as the Spotless Grass Yellow.

Kihoku area, Mie Prefecture, Japan, 28 September 2018

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