It is very difficult to differentiate these species.
In general aliena are slightly larger (100-110mm ws, gnoma 85-95mm)
Summer aliena have a bluish colour to the wings , but winter are yellow/green
Aliena have slightly longer antenna
Aliena have grey line on the wing
I have therefore decided to sell these combined- so you may get an aliena or gnoma!
Japan
WS 100mm
The tips of the tails naturally curl- so are often a bit ragged, and they are wild caught so can have a little fraying at the edges of the wings