Parachrostia sugii 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 Micronoctuidae

Micronoctuidae

The Micronoctuidae are a family of moths that includes about 400 described species. The family was first described in 2005.Micronoctua karsholti is the smallest of all species in the Noctuoidea superfamily.-Taxonomic History:...

 family. It is known from the Ryukyu Islands

Ryukyu Islands

The , also known as the , is a chain of islands in the western Pacific, on the eastern limit of the East China Sea and to the southwest of the island of Kyushu in Japan. From about 1829 until the mid 20th century, they were alternately called Luchu, Loochoo, or Lewchew, akin to the Mandarin...

, Iriomote

Iriomote

Iriomote is the largest of the Yaeyama Islands and the second largest in Okinawa Prefecture after Okinawa Island itself....

 and Ishigaki.

Adults have been found in August, but probably occur in several generations.

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 9.5-11 mm. The forewing is relatively narrow with a bright, ovoid, yellow reniform stigma. The crosslines are all present and black or brown and waved. The terminal line is marked by tight black interveinal spots. The hindwing is grey, with an indistinct discal spot. The underside of the forewing is brownish and beige, without a pattern. The underside of the hindwing is brownish and light brown, with a discal spot.