Diplazon laetatorius (Fabricius, 1781)

Morishita, Shunsuke & Watanabe, Kyohei, 2021, -- Review- - of- - the- - genus Diplazon- - Nees, -- 1819 -- (Hymenoptera: -- Ichneumonidae Diplazontinae) -- from- - Japan, Zootaxa 4964 (1), pp. 103-122 : 106-107

Diplazon laetatorius (Fabricius, 1781)

(Figs 7–10)

Ichneumon laetatorius Fabricius, 1781: 424 .

See Yu et al. (2016) for detail.

Diagnosis. Face covered with dense punctures. Antenna with 16–17 flagellomeres. Mesopleuron covered with dense punctures except for on and below speculum (Fig. 9). Propodeal carinae complete. Metasoma polished and dorsoventrally depressed. Transverse impressions distinct on T I to T IV. T I 0.90–1.25 × as long as maximum width. T II 0.55–0.70 × as long as maximum width. T II and T III rugulose but also covered with large and dense punctures (Fig. 10). Face black except for a pair of longitudinal stripes along inner orbit yellow (Fig. 8). Scutellum largely yellow. Mesopleuron entirely black (Figs 7, 9). Coxae orange (Fig. 7). Hind tibia is banded as “black-white-blackorange” (Fig. 7). Metasoma black except for posterior part of T I to T III orange (Fig. 10). T I to T IV often entirely orange.

Specimens­­examined. JAPAN: 1♀, Hokkaido, Menashitomari , 29. VII. 1969, M. Suwa leg. ( SEHU) ; 1♀, Hok- kaido, Rishiri Is. , 15. VII. 1968, H. Takizawa leg. ( SEHU) ; 1♀, Hokkaido, Yukomanbetsu Town , 29. VII. 1967, M. Miyazaki leg. ( SEHU) ; 1♀, Hokkaido, Sapporo , 20. V. 1967, K. Kusigemati leg. ( SEHU) ; 1♀, ditto, 4. VII. 1968 ( SEHU) ; 1♀, ditto, 5. VII. 1968 ( SEHU) ; 1♀, ditto, 28. VIII. 1968 ( SEHU) ; 1♀, Saitama Pref., Satte City, Makinoji 4. VI. 2009, S. Yoshizawa leg. ( KPMNH) ; 1♀, Saitama Pref., Sayama City , 20. IV. 1968, H. Takizawa leg. ( SEHU) ; 1♀, Tokyo, Mt. Takao , 12. VII. 1970, H. Takizawa leg. ( SEHU) ; 2♀, Tokyo, Ogasawara Isis. , Mukojima Is., 4. III. 2010, H. Sawada leg. ( KPMNH) ; 1♀, Kanagawa Pref., Chigasaki City, Serizawa 10. V. 2013, K. Watanabe leg. ( KPMNH) ; 1♀, Kanagawa Pref., Hadano City, Mt. Koubouyama 6. IV. 2008, K. Watanabe leg. ( KPMNH) ; 1♀, ditto, 1. V. 2016 ( KPMNH) ; 1♀, Kanagawa Pref., Hadano City, Chimura, Mt. Zukkoyama 16. IV. 2017, K. Wata- nabe leg. ( KPMNH) ; 1♀, Kanagawa Pref., Nakai Town, Zoushiki 16. IV. 2019, K. Watanabe leg. ( KPMNH) ; 2♀, Kanagawa Pref., Kaisei Town, Kanaishima 22. III. 2016, K. Watanabe leg. ( KPMNH) ; 1♀, Kanagawa Pref., Kaisei Town, Yoshidajima, nr. Sakawagawa 23. IX. 2014, K. Watanabe leg. ( KPMNH) ; 1♀, Kanagawa Pref., Odawara City, Kuno 14. III. 2014, K. Watanabe leg. ( KPMNH) ; 1♀, Kanagawa Pref., Odawara City, Kayama 21. III. 2015, K. Watanabe leg. ( KPMNH) ; 1♀, Shizuoka Pref., Gotenba City 10. VI. 1967, T. Kocha leg. ( SEHU) ; 1♀, Aichi Pref., Toyohashi City, Ishimaki, Ege 14. X. 2018, S. Morishita leg. ( TMNH) ; 1♀, Aichi Pref., Toyohashi City, Imure, Takayama 21. V. 2019, S. Morishita leg. ( YPT) ( TMNH) ; 2♀, Aichi Pref., Shinshiro City, Tsukudeiwanami 17. V. 2019, S. Morishita leg. ( TMNH) ; 4♀, Aichi Pref., Nisshin City, Nokata 28. V –3. VI. 2011, H. Seo leg. ( MT) ( MU) ; 4♀, ditto, 25. VI –1. VII. 2011 ( MT) ( MU) ; 1♀, ditto, 2–9. X. 2011 ( MT) ( MU) ; 1♀, Aichi Pref., Nisshin City, Komenogi 28. V –3. VI. 2011, H. Seo leg. ( MT) ( MU) ; 1♀, ditto, 10– 17. VI. 2011 ( MT) ( MU) ; 1♀, ditto, 25. VI –1. VII. 2011 ( MT) ( MU) ; 1♀, Aichi Pref., Nagoya City, Nakagawa, Mizusato 14. VI. 2000, S. Yamada leg. ( YPT) ( MU) ; 1♀, Aichi Pref., Ichinomiya City 14–20. X. 2006, C. Ueshima leg. ( MT) ( MU) ; 1♀, Gifu Pref., Kani City, Katabira 1–7. V. 2004, K. Ito leg. ( MT) ( MU) ; 1♀, ditto, 15–21. V. 2004 ( MT) ( MU) ; 1♀, ditto, 3–9. VI. 2004 ( MT) ( MU) ; 1♀, Nagano Pref., Shinshushinmachi Town, Kamikochi 27. VII. 2008, C. Sato leg. ( KPMNH) ; 1♀, Toyama Pref., Toyama City, Higashikuromaki, Ueno 3. X. 2010, T. Yamauchi leg. ( KPMNH) ; 1♀, Ishikawa Pref., Nomi City, Mitsukuchi 30. IV–13. V. 2011, H. Fukutomi leg. ( MT) ( MU) ; 1♀, ditto, 8–21. IX. 2011 ( MT) ( MU) ; 1♀, ditto, 6–21. X. 2011 ( MT) ( MU) ; 1♀, Ishikawa Pref., Hakusan City, Yawata 10–16. V. 2009, H. Fukutomi leg. ( MT) ( MU) ; 1♀, ditto, 21–27. VI. 2009 ( MT) ( MU) ; 1♀, Kyoto Pref., Kyoto City, Iwakura 18. VI. 1971, N. Ueda leg. ( SEHU) ; 2♀, Hyogo Pref., Sanda City, Fukushima, Arimafuji-park 16. V. 2017, K. Watanabe leg. ( KPMNH) ; 1♀, Shimane Pref., Ooda City, Kute, Satsuka 15. VII. 2016, K. Watanabe leg. ( KPMNH) ; 1♀, Tokushima Pref., Awa City, Zennyuji-toh , 6–18. VI. 2003, K. Ohara leg. ( MT) ( MU) ; 1♀, Kagoshima Pref., Kirishima City, Oda, Hayato 28. X. 1973, H. Kamiwada leg. ( SEHU) ; 4♀, Kagoshima Pref., Kirishima City, Jusantsukubaru 28. X. 1973, H. Ka- miwada leg. ( SEHU) ; 1♀, Kagoshima Pref., Kirishima City, Oda, Hayato 28. X. 1973, H. Kamiwada leg. ( SEHU) ; 1♀, Kagoshima Pref., Kagoshima City, Uearata 27. III. 1973, K. Kusigemati leg. ( SEHU) ; 1♀, ditto, 23. VI. 1973 ( SEHU) ; 15♀, ditto 18. X. 1973, ( SEHU) ; 1♀, ditto, 1. XI. 1973 ( SEHU) ; 4♀, Kagoshima Pref., Kagoshima City, Sakurajima 13. V. 1974, K. Kusigemati leg. ( SEHU) ; 3♀, Kagoshima Pref., Tanegashima Is., Ohirono 18. XI. 1986, H. Nagase leg. ( KPMNH) ; 1♀, Okinawa Pref., Nago City, Kayou 6. VI. 2013, S. Yoshizawa leg. ( KPMNH) ; 1♀, Okinawa Pref., Iriomotejima Is., Sonai 20. III. 2015, K. Watanabe leg. ( KPMNH) .

Distribution. Japan (Hokkaido, Honshu, Sado Is., Hachijyojima Is., Ogasawara Isis., Shikoku, Kyusyu, Tanegashima Is., Amamioshima Is., Okinawajima Is., and Iriomotejima Is.); this species has also worldwide distribution.

Bionomics. A number of hoverfly species have been recorded as a host (See Yu et al. 2016 for detail). In Japan, the following seven species have been recorded as a host: Betasyrphus serarius (Wiedemann, 1830) ; Episyrphus balteatus (De Geer, 1776) ; Eupeodes (Metasyrphus) corollae (Fabricius, 1749) , Eupeodes frequens Matsumura, 1917 ; Ischiodon scutellaris (Fabricius, 1805) ; Meliscaeva omogensis (Shiraki & Edashige, 1953) ; Platycheirus urakawensis (Matsumura, 1919) ( Uchida, 1957; Minamikawa, 1969; Kusigemati, 1981).

Remarks.­­ This is the first record of this species from Tanegashima Island and Iriomotejima Island. This is the most commonly collected species and is a characteristic species of this genus. It can be easily distinguished from any other species of this genus by the tricolored hind tibia and orange color of metasoma. Klopfstein (2014) noted that the male of this species has been collected in North America and India. In Japan, no male of this species was identified.