No. 5. probably Brunia antica.

It looks like nigh impossible to separate the females of the two species.
Brunia antica is much the commoner of the two.

Valid examples of B. sarawaca.
http://www.jpmoth.org/~dmoth/Digital...20sarawaca.htm

Valid examples of Brunia antica. B. sarawaca is unknown in HK.
http://www.ccs-hk.org/DM/butterfly/A...ia-antica.html
http://www.hkwildlife.net/viewthread...table&tid=8024

TL Seow :Cheers.