OSAKA — The widow of Kaoru Sumiyoshi on Jan. 24 will present 6,086 butterfly specimens left by her husband, who was known for his research on swallowtails, to the Osaka Municipal Natural History Museum.Sumiyoshi was a former professor at Hyogo Education University and passed away in September 1995 at age 70. His wife Michiko has in the past presented valuable butterfly specimens to the museum. It was her late husband’s wish that his specimens be used to help promote culture.The collection of specimens to be presented this time focuses on swallowtail butterflies and includes rare foreign species. The specimens are estimated to be worth about 37 million yen.As a result of the donation, the museum’s collection of butterfly specimens will become one of the largest in the world. The museum is scheduled to place Sumiyoshi’s collection, including those it received in the past, on special public display Jan. 25 through April 6.