This came flapping inside our car in last Midsummer day (23.6.2007). I have been looking around to identify the black-and-while beauty, but with small success so far. Any ideas? There were several of these flying fast around small path/road cutting through mixed woods in central Häme (a bit north from Tampere).
frans goes blog 
Chiasmia clathrata (ruutumittari)?
http://perhoset.1g.fi/A/A12/241/A12_272/clathrata.htm
(As you probably remember, I know absolutely nothing about butterflies, but couldn’t resist the challenge)
For a silly reason the same comment ended up to your Flick account under the poster name oma.varasto, which is my Gmail backup address 😉
Thanks also here: Yes, you are most probably right:
Ruutumittari – Latticed Heath – Chiasmia/Semiothisa clathrata
see: en.wikipedia.org/wiki/Latticed_Heath
Many thanks!