''Arsacia'' is a monotypic moth genus of the family

Noctuidae The Noctuidae, commonly known as owlet moths, cutworms or armyworms, are a family of moths. They are considered the most controversial family in the superfamily Noctuoidea because many of the clades are constantly changing, along with the other f ...

. Its only species is ''Arsacia rectalis''. Both the genus and species were described by Francis Walker, the genus in 1866 and the species in 1863. It is found from the Indo-Australian tropics of India,

Sri Lanka Sri Lanka (, ; si, ශ්‍රී ලංකා, Śrī Laṅkā, translit-std=ISO (); ta, இலங்கை, Ilaṅkai, translit-std=ISO ()), formerly known as Ceylon and officially the Democratic Socialist Republic of Sri Lanka, is an ...

to Queensland and the Solomon Islands.

Description

Palpi porrect (extending forward), where the second joint thickly scaled, and third joint minute and acute. Frontal tuft absent. Antennae almost simple in male. Thorax and abdomen smoothly scaled. Tibia naked. Forewings with quadrate apex. Outer margin rounded. Inner margin lobed and with slight tufts of hair near base and at outer angle. Veins 7, 8, 9 and 10 stalked. The wingspan is 14–18 mm. Adults have been recorded on wing in March. Head and thorax rufous. Abdomen fuscous. Forewings bright chestnut. The costa suffused with pink. There is an oblique line runs from apex to middle of inner margin, the area beyond it suffused with pink and with indistinct sub-marginal and marginal series of patches of dark scales. Hindwings dark fuscous.

Biology

The larvae feed on the young leaves of '' Dalbergia'' species. They form a shelter from two leaves tied together with silk. The larvae are darkish grass green with a yellowish-green head. Pupation takes place in a loose silken cocoon that incorporates detritus.''The Moths of Borneo''
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References

* * Catocalinae Moths described in 1863 Monotypic moth genera {{Catocalinae-stub