''Pycnarmon nebulosalis'' is a

moth Moths are a group of insects that includes all members of the order Lepidoptera that are not Butterfly, butterflies. They were previously classified as suborder Heterocera, but the group is Paraphyly, paraphyletic with respect to butterflies (s ...

in the family

Crambidae Crambidae comprises the grass moth family of lepidopterans. They are variable in appearance, with the nominal subfamily Crambinae (grass moths) taking up closely folded postures on grass stems where they are inconspicuous, while other subfamilies ...

. It was described by

George Hampson Sir George Francis Hampson, 10th Baronet (14 January 1860 – 15 October 1936) was an English entomologist. Hampson studied at Charterhouse School and Exeter College, Oxford. He travelled to India to become a tea-planter in the Nilgiri Hills ...

in 1896. It is found in

Sri Lanka Sri Lanka, officially the Democratic Socialist Republic of Sri Lanka, also known historically as Ceylon, is an island country in South Asia. It lies in the Indian Ocean, southwest of the Bay of Bengal, separated from the Indian subcontinent, ...

. The

wingspan The wingspan (or just span) of a bird or an airplane is the distance from one wingtip to the opposite wingtip. For example, the Boeing 777–200 has a wingspan of , and a wandering albatross (''Diomedea exulans'') caught in 1965 had a wingsp ...

is about 18 mm. Adults are white, thickly mottled with brown. The forewings are brown, except for some white specks near the base, a patch in the cell, an apical patch and a spot at the middle of the outer margin. There are traces of a dark waved antemedial line and there is a dark-edged white discocellular spot, as well as a dark-waved postmedial line defined by white and bent outwards between veins 7 and 4. There is also a dark marginal line. The hindwings have a white basal area and a fuscous discocellular spot. There is an irregularly waved postmedial line defined by white and with some diffused fuscous on its inner edge and there is a dark marginal line with some dentate white marks on its inner edge.

References

Spilomelinae Moths described in 1896 Moths of Sri Lanka {{Spilomelinae-stub