Butterflies of the Indian subcontinent
One-spot Grass Yellow
Eurema andersoni  MOORE, 1886
subfamily - COLIADINAE
Tribe -
Eurema andersonii, Chilapata, West Bengal, India Adrian Hoskins
The Grass Yellows are all fairly small butterflies, readily recognised by their bright yellow wings and their habit of gathering in small groups on patches of damp sand or soil. Despite their name, none of their caterpillars feed on grasses - the name is derived from the fact that most species are found in disturbed grassy habitats.
The One-spot Grass Yellow gets its popular name from the single dark mark in the discal cell of the underside forewing. This distinguishes it from other similar species e.g. blanda has 3 spots, while both hecabe and simulatrix have 2 spots. Another useful diagnostic feature is the dark mark on the underside apex - this is in the form of a suffused dark bar in andersoni, a squarish blotch in sari and simulatrix, and is usually absent in hecabe and blanda.
Grass Yellows are among the most familiar of tropical butterflies, with a total of 70 known species worldwide, of which 36 are found in the neotropical region, 13 in North America ( including Mexico ), 10 in Africa, 25 in the Oriental region and 10 in Australia / Papua New Guinea. Many of the species are migratory in behaviour, with the ranges of several such as hecabe overlapping into in 2 or more of the zoogeographical regions.
Eurema andersoni is found in India, Sri Lanka, Bhutan, Myanmar, Laos, Cambodia, Vietnam, China, Taiwan, the Philippines, Thailand, Malaysia, Sumatra, Borneo, Sulawesi and Java.
This species is found in secondary or disturbed habitats including forest clearings, along roadsides and riverbanks, and in parks and gardens at elevations between sea level and about 1000m.
To be completed.
Eurema andersonii, Chilapata, West Bengal, India Adrian Hoskins
Adult behaviour
Males gather to imbibe mineralised moisture from damp sandbanks. Females are more discreet in behaviour, normally being seen singly when nectaring. They visit many different flowers including Lantana and various Asteraceae. Overnight, and on overcast days, both sexes roost beneath the leaves of bushes or low herbage. Often 2 or 3 can be found roosting together under a single leaf.

Eurema andersonii, Ultapani, Assam, India Adrian Hoskins


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