Eurypteryx dianae 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 Guangxi

Guangxi

Guangxi, formerly romanized Kwangsi, is a province of southern China along its border with Vietnam. In 1958, it became the Guangxi Zhuang Autonomous Region of the People's Republic of China, a region with special privileges created specifically for the Zhuang people.Guangxi's location, in...

 in 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...

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The length of the forewings is about 32 mm. It is similar to Eurypteryx geoffreyi

Eurypteryx geoffreyi

Eurypteryx geoffreyi is a moth of the Sphingidae family. It is known from Thailand.The length of the forewings is 31 mm for males and 38 mm for females. It is similar to Eurypteryx shelfordi but smaller. The abdominal anal tuft is black. The forewing upperside of the males has no discal spot and...

. There is a small round stigma and greyish semicircular marginal area on the forewing upperside and a round yellowish discal spot on the forewing underside. Here, a dark brown almost straight submarginal line is also present, separating the lighter marginal area from the darker rest of the wing. The hindwing underside has a dark brown postmedian line.