a basic, probably dumb question I haven't found the answer to yet.

[priamus at ace-net.com.au]

I think you will find a consenus of opinion on this: Both apply.

Papilio ulysses males are attracted to cyan colouring; females to
magenta. Certain Pierids are also attracted to green and red. (Source:
D'Abrera)

Wearing a bright maroon coloured shirt, a large female Ornithoptera
priamus hovered about me for 5 minutes or so recently, despite the fact
that there were other people present, wearing nearly every other colour,
thus possibly indicating similar spectrum vision.
 
Chris Hocking
Papillon Entomology . . . . . . Quis custodiet ipsos custodes?
Don't take life too seriously . . . . . Nobody gets out alive!