Satyrium latior

Satyrium latior is a butterfly of the subfamily Lycaeninae. It was described by Johann Heinrich Fixsen in 1887. It is found in the Russian Far East, northern China and Korea.
The larvae feed on Rhamnus davurica, Rhamnus ussuriensis and Armeniaca sibirica.

Description from Seitz

latior Fixs. is one-third larger, with the colour darker and more intense, the scaling being so dense that the scent-patch of the male is hardly visible; from the Amur, Corea, and North China.