numbering of the spots        
             
             
  choice A
  • 3 narrow red bands, of similar size
  • antennae are long and show no bulge at the end 
             
             
             
  choice B
  • 3 red bands (spot No.1 is elongated and forms a band which is narrower than the two others) 
  • antennae show a bold bulge at the end
  • spots No.3&5 form a band (band 3-5) which strongly widens on the back of the wing ('comma-shaped'). The back part of band 3-5 can also show a rounded bulge, looking like a sixth spot stuck to band 3-5
 next step >>
             
             
             
  choice C
  • 2 red bands (spot No.1 is elongated and spots No.2&4 thoroughly merge forming a band)
  • antennae show a bold bulge at the end
  • spots No.3 is tiny and usually well separated from spot No.5 (in some individuals within a whole population,  spots No.3&5 can be linked with a narrow red line )