Entoma
Lime blue, Chilades lajus, plate

Blues and coppers

Chilades lajus

Lime blue

Lime blue caterpillars feed on young citrus leaves and are pale green, closely matching the colour of the fresh lime leaves they rest on.

WhereCitrus gardens, scrubland and forest edges
Size20 to 28 mm wingspan
WhenMarch to December

The lime blue is a small, fast-flying blue with only slight differences between the sexes; the upperside is bluish purple with a narrow dark border in males and a wider one in females, while the underside is pale grey and white with a dense pattern of small dark brown spots edged in white.

Caterpillars feed on the young leaves of citrus trees and related plants and are pale green throughout their instars, matching their host leaves closely, and several generations can be produced through the year wherever citrus grows in gardens, scrubland or forest edges.

Traits

Habitat

Garden

Colour

Blue, Brown, White

Active

Day

To people

Not known to bite or sting people.

Activity through the year

Often confused with

Plains cupidnot in guide
Chilades pandava

The black spot near the hindwing tornus is capped with orange in the plains cupid, while the lime blue's tornal spot has no orange cap.

Questions

Is the Lime blue dangerous to people?

Not known to bite or sting people.

When can you see the Lime blue?

The Lime blue can be seen from March to December, by day.

Plate retouched from a museum specimen photo by Lee Kong Chian Natural History Museum, National University of Singapore, CC BY 4.0, GBIF Licence

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Butterflies and moths›Blues and coppers›Chilades

Last updated 2026-09-27. Every entry is checked against published sources.