Chrysozephyrus smaragdinus is a small butterfly found in the East Palearctic that belongs to the lycaenids or blues family.

But the pale, more dust-grey, underside distinguishes it from the preceding species, as also does a transverse line on the hindwing which is placed far proximally from the usual band.

However, the main difference lies in the larva , which is yellow instead of brown , with distinctly contrasting black stigma-dots on segments 1 and 4 to 11; on cherry, according to Graeser also on Quercus mongolica, very plentiful in certain years, but a large proportion (90%) infested by Tachina.

— With certainty only known from Amurland and North China; the records from other countries are doubtful, as the insect may possibly have been confounded with other green species.

P. matsumurana, P. verecunda, P. padus, P. jamasakura, P. buergeriana, P. donarium, P. yedoensis, P. subhirtella), Quercus mongolica , Carpinus laxiflora, Celtis sinensis [3]