Biological specimens in museum collections are important source to biodiversity research. International cooperation to study these specimens significantly improves the understanding of local fauna or flora. In recent decades a consensus has been reached that the type series of a newly described species or voucher specimens, if collected from other countries, shall be returned in a whole or a part to the country of origin. These are type specimens of two thyatirid moth species from Taiwan, Epipsestis meilingchani and E. dubia chengshinglini. They were named after Dr. Mei-Ling Chan and Dr. Cheng-Shing Lin respectively by Hungarian researchers Gy. M. Laszolo and G. Ronkay who cooperated with NMNS to study Taiwan’s moths.