Sesia radians Walker, 1856, List Specimens lepid. Insects Colln Br. Mus. 8: 84. Type locality: North China, Shanghai.
Synonym. Sesia radians Walker, 1856.
Synonym. Hemaris mandarina Butler, 1875.
Synonym. Macroglossa fuciformis brunneobasalis Staudinger, 1892.
Wingspan: 37--40mm. Dorsal surface of thorax and abdomen naturally ochreous (with no trace of green), as are the base of the hindwings. Forewing discal cell longitudinally divided by a distinct or vestigial scale fold, rarely undivided; inner edge of marginal band unexpanded at M2, even (f. mandarina) or dentate (f. radians). Upperside of foretibia and foretarsus black; apical third of hindtibia blue-black like upperside of hindtarsus.
Male genitalia very similar to Hemaris tityus but gnathos more asymmetrical, obliquely rounded apically. Both valves slightly more spatulate. Female genitalia similar in general structure to Hemaris tityus, but antrum funnel-shaped, not square.
A species of rich meadows in both coniferous and mixed woodlands. Ecologically, this species appears to replace Hemaris tityus over much of Siberia and the Russian Far East (Serge Yevdoshenko, pers. comm. 2018). Attracted to the flowers of Syringa, especially Syringa oblata Lindl. around Beijing.
China: iv (Beijing; Zhejiang); v (Gansu); vi (Zhejiang); vii (Chongqing; Jiangxi; Heilongjiang; Nei Mongol); viii-ix (Zhejiang). North Korea: vii (North Hamgyong Province). Japan: iv-v (Honshu); vi-viii (Hokkaido; Ryukyu Archipelago); vii (Kyushu); vii-viii (Honshu); 11.viii (Shikoku); ix (Kyushu). Russia: 8.v-11.vi (Primorskiy Krai); 10.vi (Buryatia); 6.vii (Tuva ASSR); 17.vii (Primorskiy Krai); 10.viii (Primorskiy Krai).
Park et al. (1999) give mid May until late July as the flight period in Korea.
Larval hostplants. Recorded in Primorskiy Krai, Russia, from Lonicera and Rubia (Derzhavets, 1984). In Amurskaya, Russia, recorded from Rubia cordifolia (Streltzov, Osipov & Malikova, 2003). Recorded in Korea on Lonicera japonica (Park et al., 1999). However, Serge Yevdoshenko (pers. comm., 2018) doubts records of Lonicera, having found/reared this species only on Knautia and Scabiosa, notably Scabiosa lachnophylla in Primorskiy Krai, Russian Far East (Koshkin & Yevdoshenko, 2019).
China: Nei Mongol (Da Hinggan Ling, ??Inn Shan, 200m; Jalaid Qi); Heilongjiang (Xiao Hinggan Ling, ??Buchalu, 1100m; ??Barim); Beijing (Mentougou, 1700m); Gansu (Maijishan, 1500m); Shanghai; Zhejiang (Tianmu Shan; Mogan Shan); Chongqing (Jinfo Shan); Jiangxi (Jiujiang).
Mongolia: Sèlèngè Province (Jeröö Gol/River near Duulan-Chan).
North Korea: Kangwon Province (Keumgang-san; Sepo); South Pyongan Province (Pyongyang); North Hamgyong Province (Hoeryong; Ungiryung; Gyungsung; Chongjin).
South Korea: Seoul; Kyonggi Province (Gwangleung; Cheonma-san; Soyo-san; Godae-san; Yongmun-san; Yangpyong; Hwasung); Kangwon Province (Seolak-san; Odae-san; Baeduk-san; Ssangyong); North Chungchong Province (Songni-san); North Cholla Province (Jiri-san); South Cholla Province (Baekyang Temple; Wan-do); North Kyongsang Province (Sangju; Jikji Temple; Juwang-san); South Kyongsang Province (Tongdo Temple; Hadong; Hamyang); Cheju Province (Cheju-do).
Japan: Hokkaido (Hakodate; Ishikawa; Mt Iwamuro); Honshu (Fushiki; Kuroson Tosa; Mukoyama; Oiwake; Tokei-ji; Nagasaki; Tokyo; Nikko; Yoshino; Yokohama; Nagano); Shikoku; Kyushu (Kagoshima; Unzen); Tsushima; Ryukyu Archipelago (Okinawa; Ishigakishima; Iriomoteshima).
Russia: Tuva ASSR (Naryn River, 1500m); Buryatia (Ulan-Ude); Transbaikalia (Butyvken; Nizhnii Tsasuchei); Amurskaya (Blagoveshchensk); Khabarovskiy Krai (Pivan); Primorskiy Krai (18km SE Ussuriysk; Primorskiy; Khasan; Andreevka; Gayvoron; Narva; Pogranichniy).
The Tuvinian individual, captured on 6.vii.1996 at 50°08'N 96°00'E (Danner, Eitschberger & Surholt, 1998), may indicate that this species is spreading westwards in response to global warming.
Southern Siberia, Mongolia, the southern Russian Far East, northeastern and central-eastern China, the Korean Peninsula and Japan.
Holarctic; eastern Palaearctic region. Pleistocene refuge: Polycentric -- Japanese and Sinopacific refugia.