Demeter Longwing

Heliconius demeter, the Demeter longwing, is a butterfly of the family Nymphalidae. It was described by Otto Staudinger in 1897. It is found in the Northern and Eastern part of the Amazon basin, from Guyana to Northern Brazil and Peru. The habitat consists of sandy rainforests.

The larvae are solitary and feed on Dilkea (Passifloraceae) species. They reach a length of about 20 mm.

Adult H. demeter are distinguished morphologically from their sister species Heliconius eratosignis because they have a yellow streak on the base of the forewing costa underside; in contrast, Heliconius eratosignis has a solid orange basal costal margin on the underside of the forewing. Brown & Benson in 1975 recognized these differences but argued that the two forms were subspecies of the same species. They also recorded both Heliconius eratosignis gregarious and H. demeter solitary larvae in their paper. The Tree of Life web project has yet to recognize Heliconius eratosignis as a separate species, but shows an image of a male Heliconius eratosignis from Peru under the description of H. demeter.

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