Eurema simulatrix

Eurema simulatrix, the changeable grass yellow, is a butterfly in the family Pieridae. It is found from Burma to Sundaland, Cambodia and the Philippines.^[2] The habitat consists of secondary or disturbed habitats including forest clearings, roadsides and riverbanks, parks and gardens.^[3]

Changeable grass yellow
Dorsal view (specimen)
E. s. tecmessa, Thailand
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Lepidoptera
Family:	Pieridae
Genus:	Eurema
Species:	E. simulatrix
Binomial name
Eurema simulatrix (Semper, 1891)[1]
Synonyms
Terias simulatrix Semper, 1891 Terias tecmessa de Nicéville & Martin, [1896] Terias hecabe grandis f. sarinoides Fruhstorfer, 1910 Eurema simulatrix tecmessa f. stockleyi Corbet & Pendlebury, 1932

The length of the forewings is 21–26 mm (0.83–1.02 in) for males and 19–25 mm (0.75–0.98 in) for females.^[4] Adults have two cell spots on the underside of the forewings and a large, almost cleft, reddish-brown apical spot on the forewing.^[5]

Subspecies

The following subspecies are recognised:^[1]

• E. s. simulatrix (Philippines: Mindanao)
• E. s. princessae Morishita, 1973 (Palawan)
• E. s. tecmessa (de Nicéville & Martin, [1896]) (southern Burma, Peninsular Malaya, southern Thailand, Singapore, Sumatra, Java, Borneo) – de Nicéville's grass yellow
• E. s. sarinoides (Fruhstorfer, 1910) (Sikkim to Burma, northern Thailand, Laos) – scarce changeable grass yellow
• E. s. littorea Morishita, 1968 (Langkawi)
• E. s. inouei Shirôzu & Yata, 1973 (Thailand, Cambodia, Indo-China)
• E. s. tiomanica Okubo, 1983 (Tioman)

Eurema irena is sometimes treated as a subspecies of Eurema simulatrix.