Off white cow?

Off white cow?

Observation - Off white cow?. Description: The lines on the paper in the final image are approximately 8mm apart so I would make the winglength here 18-20mm. Not a species I have seen before (and it evaded capture so these photos are all I have to go on) hence confirmation particularly apprecia

The lines on the paper in the final image are approximately 8mm apart so I would make the winglength here 18-20mm.

Not a species I have seen before (and it evaded capture so these photos are all I have to go on) hence confirmation particularly appreciated.