Eurema simulatrix, the Changeable Grass Yellow, is a butterfly

Butterfly

A butterfly is a mainly day-flying insect of the order Lepidoptera, which includes the butterflies and moths. Like other holometabolous insects, the butterfly's life cycle consists of four parts: egg, larva, pupa and adult. Most species are diurnal. Butterflies have large, often brightly coloured...

 in the Pieridae

Pieridae

The Pieridae are a large family of butterflies with about 76 genera containing approximately 1,100 species, mostly from tropical Africa and Asia. Most pierid butterflies are white, yellow or orange in coloration, often with black spots...

 family. It is found from Burma to Sundaland

Sundaland

Sundaland is a biogeographical region of Southeastern Asia which encompasses the areas of the Asian continental shelf that was exposed during the last ice age. It included the Malay Peninsula on the Asian mainland, as well as the large islands of Borneo, Java, and Sumatra and their surrounding...

 and the Philippines

Philippines

The Philippines , officially known as the Republic of the Philippines , is a country in Southeast Asia in the western Pacific Ocean. To its north across the Luzon Strait lies Taiwan. West across the South China Sea sits Vietnam...

. The habitat consists of secondary or disturbed habitats including forest clearings, roadsides and riverbanks, parks and gardens.

The length of the forewings is 21 millimetre for males and 19 millimetre for females. Adults have two cell spots on the underside of the forewings and a large, almost cleft, reddish brown apical spot on the forewing.

Subspecies

The following subspecies are recognised:

• Eurema simulatrix simulatrix (Philippines: Mindanao)
• Eurema simulatrix princessae Morishita, 1973 (Palawan)
• Eurema simulatrix tecmessa (de Nicéville & Martin, [1896]) (southern Burma, Peninsular Malaya, southern Thailand, Singapore, Sumatra, Java, Borneo) -de Nicéville's Grass Yellow
• Eurema simulatrix sarinoides (Fruhstorfer, 1910) (Sikkim to Burma, northern Thailand, Laos) -Scarce Changeable Grass Yellow
• Eurema simulatrix littorea Morishita, 1968 (Langkawi)
• Eurema simulatrix inouei Shirôzu & Yata, 1973 (Thailand, Indo-China)
• Eurema simulatrix tiomanica Okubo, 1983 (Tioman)

Eurema irena

Eurema irena

Eurema irena is a butterfly in the Pieridae family. It is endemic to Sulawesi.-Taxonomy:Eurema irena was treated as a subspecies of Eurema simulatrix, but formally raised to full species status by Yata in 1994)....

is sometimes treated as a subspecies of Eurema simulatrix.