''Leucomonia'' is a genus of

moth Moths are a paraphyletic group of insects that includes all members of the order Lepidoptera that are not butterflies, with moths making up the vast majority of the order. There are thought to be approximately 160,000 species of moth, many of w ...

s in the family

Sphingidae The Sphingidae are a family of moths (Lepidoptera) called sphinx moths, also colloquially known as hawk moths, with many of their caterpillars known as “hornworms”; it includes about 1,450 species. It is best represented in the tropics, bu ...

, containing only one species, ''Leucomonia bethia'', which is known from

New South Wales ) , nickname = , image_map = New South Wales in Australia.svg , map_caption = Location of New South Wales in AustraliaCoordinates: , subdivision_type = Country , subdivision_name = Australia , established_title = Before federation , es ...

and

Queensland ) , nickname = Sunshine State , image_map = Queensland in Australia.svg , map_caption = Location of Queensland in Australia , subdivision_type = Country , subdivision_name = Australia , established_title = Before federation , established_ ...

. Adults have grey forewings, each with some dark angular lines and a dark dot near the middle. The hindwings are dark brown. The larvae have been recorded feeding on ''

Clerodendrum floribundum ''Clerodendrum floribundum'', known as the lolly bush or smooth clerodendrum, is a shrub or tree found in Australia and New Guinea. The habitat is in or at the margins of coastal rainforests, up to 300 metres above sea level. In Western Australi ...

''. Early instars are green with a forward-curving dark brown tail-horn. Later instars develop diagonal white stripes on the side of each segment and the horn curves backward. There is a brown form of later instars for which the diagonal stripes are less conspicuous. Full-grown larvae are about 70 mm long. The caterpillars usually rest by day on the underside of a leaf of their foodplant. Pupation takes place in a brown pupa.

References

Sphingini Monotypic moth genera Taxa named by Walter Rothschild Taxa named by Karl Jordan Moths of Australia {{Sphinginae-stub