Andriasa mitchelli 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 Malawi

Malawi

The Republic of Malawi is a landlocked country in southeast Africa that was formerly known as Nyasaland. It is bordered by Zambia to the northwest, Tanzania to the northeast, and Mozambique on the east, south and west. The country is separated from Tanzania and Mozambique by Lake Malawi. Its size...

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The length of the forewings is 34.8-35.2 mm for males. It is similar to Andriasa contraria contraria

Andriasa contraria

Andriasa contraria is a moth of the Sphingidae family. It is known from tropical Africa, including Kenya, Cameroon and South Africa. It is a very variable species and is common in all habitats except deserts and high mountains....

, but larger and differing in the more extensive dark brown subapical patch on the costa of the forewing upperside and the white midtibiae and hindtibiae. The forewings are longer and the outer margin is more convex.