Gnathothlibus fijiensis is a moth

Moth

A moth is an insect closely related to the butterfly, both being of the order Lepidoptera. Moths form the majority of this order; there are thought to be 150,000 to 250,000 different species of moth , with thousands of species yet to be described...

 of the Sphingidae

Sphingidae

Sphingidae is a family of moths , commonly known as hawk moths, sphinx moths and hornworms, that includes about 1,200 species . It is best represented in the tropics but there are species in every region . They are moderate to large in size and are distinguished among moths for their rapid,...

 family. It is known from Fiji

Fiji

Fiji , officially the Republic of Fiji , is an island nation in Melanesia in the South Pacific Ocean about northeast of New Zealand's North Island...

.

The length of the forewings is 38-41 mm for males and 40-44 for females. It is similar to Gnathothlibus eras

Gnathothlibus eras

Gnathothlibus eras is a moth of the Sphingidae family. It is known from the eastern Sunda Islands , Sulawesi, the Moluccas, the Philippines, New Guinea, the Solomon Islands, Micronesia and eastern Australia....

, Gnathothlibus saccoi

Gnathothlibus saccoi

Gnathothlibus saccoi is a moth of the Sphingidae family. It is known from Vanuatu.The length of the forewings is 42-49 mm for males and 52-57 mm for females. It is similar to but differs from Gnathothlibus erotus in its larger size and broader wings with prominent markings. The antennae are...

and Gnathothlibus vanuatuensis

Gnathothlibus vanuatuensis

Gnathothlibus vanuatuensis is a moth of the Sphingidae family. It is known from Vanuatu.The length of the forewings is 37.5-44.3 mm for males and 39.5-40.7 mm for females...

but distinguishable by the distinctive olive green ground colour of the forewing upperside and the mauve outer edge to the tegula in the males.

Etymology

The specific name fijiensis is derived from the Pacific island nation of Fiji, the only known locality for the species.