Eupanacra perfecta 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 north-eastern India

India

India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

, Bhutan

Bhutan

Bhutan , officially the Kingdom of Bhutan, is a landlocked state in South Asia, located at the eastern end of the Himalayas and bordered to the south, east and west by the Republic of India and to the north by the People's Republic of China...

, Myanmar

Myanmar

Burma , officially the Republic of the Union of Myanmar , is a country in Southeast Asia. Burma is bordered by China on the northeast, Laos on the east, Thailand on the southeast, Bangladesh on the west, India on the northwest, the Bay of Bengal to the southwest, and the Andaman Sea on the south....

, south-western China

China

Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...

, northern Thailand

Thailand

Thailand , officially the Kingdom of Thailand , formerly known as Siam , is a country located at the centre of the Indochina peninsula and Southeast Asia. It is bordered to the north by Burma and Laos, to the east by Laos and Cambodia, to the south by the Gulf of Thailand and Malaysia, and to the...

 and Vietnam

Vietnam

Vietnam – sometimes spelled Viet Nam , officially the Socialist Republic of Vietnam – is the easternmost country on the Indochina Peninsula in Southeast Asia. It is bordered by China to the north, Laos to the northwest, Cambodia to the southwest, and the South China Sea –...

.

The wingspan

Wingspan

The wingspan of an airplane or a bird, is the distance from one wingtip to the other wingtip. For example, the Boeing 777 has a wingspan of about ; and a Wandering Albatross caught in 1965 had a wingspan of , the official record for a living bird.The term wingspan, more technically extent, is...

 is 56-64 mm. It is similar in colour to Eupanacra metallica

Eupanacra metallica

Eupanacra metallica is a moth of the Sphingidae family. It is found from north-western India across Nepal, Bhutan, Bangladesh and northern Myanmar to south-western China....

. The forewing outer margin is not or only very slightly excavate posterior to the apex. The forewing upperside has postmedian lines which are more longitudinal than in Eupanacra sinuata

Eupanacra sinuata

Eupanacra sinuata is a moth of the Sphingidae family. It is known from Nepal, north-eastern India, south-western China, northern Thailand and Vietnam....

and run parallel to the outer margin. The first postmedian line is closer to the base on the inner margin. There is a distinct double submarginal line present parallel to the outer margin. The forewing underside is similar to Eupanacra metallica, but the postmedian line is more oblique and abbreviated. There is a pair of more distinct submarginal lines present, the space between them is whitish. The hindwing upperside has a pale median band which is slightly wider than in Eupanacra sinuata, nearly reaching the costa but obscured by brown scaling anteriorly. The third postmedian line on the hindwing underside is as heavy or heavier than the first and accentuated by vein dots.

Subspecies

• Eupanacra perfecta perfecta (north-eastern India, Bhutan, Myanmar, south-western China, northern Thailand, Vietnam)
• Eupanacra perfecta tsekoui (Clark, 1926) (Yunnan in south-western China)