Eupanacra angulata 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 Sumatra

Sumatra

Sumatra is an island in western Indonesia, westernmost of the Sunda Islands. It is the largest island entirely in Indonesia , and the sixth largest island in the world at 473,481 km2 with a population of 50,365,538...

.

The forewing upperside is brown with darker brown margins. The prominent postmedian band continuous from the inner margin to the costa. There is a large, irregular, triangular area on the outer margin emphasized by darker scaling. The hindwing upperside is brown, with a broad median band which is very diffuse on its proximal edge. There is blue scaling along the outer margin.

Etymology

It is named for the prominent line that arises at right angles to the costa, crosses the discal cell to Cu where it turns approximately 90° basad to run to the inner margin.