Mounting Behaviour in Butterflies

[Kishen.Das at gxs.com]

Dear All,
 
 I wanted to know the butterfly species that exhibit mouting behaviour. In India I have seen two species, Hypolimnas bolina and Hypolimnas misippus in which the males engage themselves in mounting. It goes on for hours together.
 
Any references on this subject will be very helpful.
 
Regards,
Kishen Das
India
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