Theretra gala 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 Indonesia

Indonesia

Indonesia , officially the Republic of Indonesia , is a country in Southeast Asia and Oceania. Indonesia is an archipelago comprising approximately 13,000 islands. It has 33 provinces with over 238 million people, and is the world's fourth most populous country. Indonesia is a republic, with an...

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The forewing upperside is very similar to Theretra indistincta manuselensis

Theretra indistincta

Theretra indistincta is a moth of the Sphingidae family. It is known from Queensland, Papua New Guinea, Indonesia and the Bismarck Archipelago....

but the ground colour is darker and deeper. The forewing underside basal area is the same pale colour as the rest of the wing, except for a small blackish area along the inner margin. A black discal spot is usually present. The females are larger and broader winged than the males, but otherwise identical in colour and pattern.