Rapala scintilla!! Your images show Dr Seow's description of "blue-shot hindwings and steely blue forewings" very beautifully. From photographs of the set specimens it is impossible to see these subtleties in colouration.

While it is clear that the uppersides of these male Rapala are vital for identifying them, I was wondering... what if we're dealing with females? Many of them are a featureless brown above. (Or, are there differences that I'm simply overlooking?)