A new species of the genus Cyanosesia O. Gorbunov et Arita, 2001 (Lepidoptera: Sesiidae) from the island of Obi, North Maluku, Indonesia with a catalogue of the genus Author Gorbunov, O. G. text Russian Entomological Journal 2020 2020-12-31 29 2 187 194 http://dx.doi.org/10.15298/rusentj.29.2.11 journal article 10.15298/rusentj.29.2.11 0132-8069 Cyanosesia vietnamica O. Gorbunov et Arita, 1995 “ Cyanosesia vietnamica sp. nov. ” — Gorbunov, Arita, 1995: 79 , figs 4, 18. Type locality: “ Vietnam , Pahia (Arbe Signal), …” [= North Vietnam :]. Holotype ♀ ( MHNG ). LITERATURE. Gorbunov, Kallies, 1998: 457 , 461, 464 ( Cyanosesia vietnamica ); Kallies, 2003: 161 ( Cyanosesia vietnamica ); Kallies, Arita, 2004: 70 ( Cyanosesia vietnamica ); Pühringer, Kallies, 2004: 11 ( Cyanosesia vietnamica ); Gorbunov, Arita, 2016: 36 , 39 ( Cyanosesia vietnamica ). FLIGHT PERIOD.The holotype was collected on May 23. HOST PLANT. Unknown. DISTRIBUTION. North Vietnam . Acknowledgements . I would like to express my cordial thanks to Mr. Maxim B. Markhasyov, Dr. Vasily K. Tuzov and Prof. Dmitry G. Zamolodchikov (all from Moscow , Russia ) for the company and help during our successful trip to North Maluku , Indonesia in 2017. I am indebted to Mr. Vlad Proklov (London, England ) for carefully checking the English of an advanced draft. The study was conducted using the equipment of the Joint Usage Center “Instrumental methods in ecology” at the A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences ( Moscow , Russia ).