Chilades lajus, the lime blue,[2] is a small butterfly found in India,[2] Sri Lanka, Myanmar, Taiwan, Hong Kong, Hainan, Mangulam Island, Sulawesi and the Philippines that belongs to the lycaenids or blues family.

Forewings and hindwings from their bases outwards to a varying extent shot with bright iridescent blue, this colour not extended on either wing to the costa, termen or dorsum.

[3] Dry-season form: Closely resemble specimens of the wet-season brood, but can always be distinguished by the somewhat paler ground colour of the upperside, while on the underside both sexes bear a large nebulous brown patch on the hindwing posteriorly.

[4] "Pale green at all stages, on the shade or the young leaves of the lime and pummelo bushes on which it feeds.

When full-grown it is about seven-sixteenths of an inch in length, onisciform as usual; the head "black, smooth and shining, with a somewhat dark green dorsal line down the body, the whole surface but very slightly shagreened and covered with extremely fine and short downy hairs.

(Lionel de Nicéville quoted in Bingham)[3] "Green; of the usual Lycaenid shape, with a dorsal and lateral series of somewhat obscure conjoined brownish spots on the upperside.