siderone polymela on my bait
took me all of 60 minutes to identify this one. Butterflies of America was again totally useless, sporting two photos of dead motheaten dull specimens and a label of enormous graphological interest. GRR.
So here is an article that did the trick. Yes it is French but that shouldn't be a problem
http://www.lasef.org/new/114(4)/2-1451 Dottax & Pierre.pdf