It is now confirmed that both Ypthima imitans and Ypthima motscholskyi are in Hong Kong.
It seems Ypthima imitans prefer higher grounds on Lantau Island. In fact both species are found almost in the same area on Lantau Island.
The genitalia below of Y. imitans is confirmed by Dr. Yoshinobu Uémura. I wish to thank Dr. Uémura for his kind assistance.