Diplazon scutatorius Teunissen, 1943

Morishita, Shunsuke & Watanabe, Kyohei, 2021, -- Review- - of- - the- - genus Diplazon- - Nees, -- 1819 -- (Hymenoptera: -- Ichneumonidae Diplazontinae) -- from- - Japan, Zootaxa 4964 (1), pp. 103-122 : 115-116

Diplazon scutatorius Teunissen, 1943

(Figs 32–36)

Diplazon scutatorius ­­ Teunissen, 1943: 52.

Diplazon pilosus Uchida, 1957: 235 . Synonymized by Manukyan (1987)

Diplazon tetragonopsis Uchida, 1957: 234 . Synonymized by Diller (1982)

Diagnosis.­­ Face covered with dense punctures. Antenna with 16–17 flagellomeres in both sexes. Mesopleuron polished and covered with dense punctures except for on and below speculum (Fig. 34). Propodeal carinae complete. Metasoma polished and dorsoventrally depressed. Transverse impressions distinct on T I to T IV. T I 0.90–1.00 (in females) or 1.00–1.15 (in males) × as long as maximum width. T II 0.55–0.70 (in females) or 0.62–0.80 (in males) × as long as maximum width. T II and T III covered with large and dense punctures (Fig. 35). Face black except for a pair of longitudinal stripes along inner orbit yellow in females (Fig. 33), entirely yellow (Fig. 36) or sometimes black except for a median spot of face which rarely disappeared and a pair of longitudinal stripes along inner orbit yellow in males. Scutellum largely yellow. Mesopleuron entirely black (Figs 32, 34). Coxae yellow except for hind coxa orange in females (Fig. 32), orange or yellow in males. Hind tibia is banded as “black-white-black” (Fig. 32). Metasoma black except for often posterior part of T I and posterior corners of T II and T III yellow.

Specimens­­examined. JAPAN: 1♀, Hokkaido, Higashikawa Town, Yukomanbetsu 29. VII. 1967, M. Miyazaki leg. ( SEHU) ; 1♀, Hokkaido, Kamikawa Town, Sounkyo 17. VII. 1968, M. Suwa leg. ( SEHU) ; 1♀, Hokkaido, Hi- daka Town, Uenzarugawa 10. VII.–1. VIII. 2007, A. Ueda leg. ( MT) ( KPMNH) ; 1♀, Iwate Pref., Yamada Town , Funakoshi 9. VI . 2007, T . Ishizaki leg. (KPMNH); 1♀, Fukushima Pref., Hinoemata Vil. 19. VII. 2004, H. Maki- hara leg. ( KPMNH) ; 1♀, Tochigi Pref., Nikko City, Okukinu 23. VII. 1969, H. Takizawa leg. ( SEHU) ; 1♀ (holo- type of D. tetragonopsis ), Tokyo, Izuoshima Is. 25. V . 1955, S. Momoi leg. (SEHU); 1♀, Saitama Pref., Ranzan, Tooyama 13. X. 2001, T . Nambu leg. (KPMNH); 1♀, Saitama Pref., Urawa City, Tajima 27. IV. 1999, T . Nambu leg. (KPMNH); 1♀, Tokyo, Akiruno City , Ninomiya, Tamagawa riverside 3. V . 2010, K. Watanabe leg. (KPMNH); 1♀, Tokyo, Takao Town , Hikagezawa to Kokesawa 3. V . 2007, K. Watanabe leg. (KPMNH); 1♀, Kanagawa Pref., Aikawa Town, Nakatsu 11. IV. 2014, K. Watanabe leg. ( KPMNH) ; 1♀, Kanagawa Pref., Hadano City, Chimura, Mt. Zukkoyama 16. IV. 2017, K. Watanabe leg. ( KPMNH) ; 1♀, Kanagawa Pref., Hadano City, Mt. Koubouyama 1. V . 2016, K. Watanabe leg. (KPMNH); 1♀, Kanagawa Pref., Kaisei Town, Kanaishima 22. III. 2016, K. Watanabe leg. ( KPMNH) ; 1♀, Kanagawa Pref., Odawara City, Shiroganerindo to Sarusawarindo 19. VI . 2015, K. Watanabe leg. (KPMNH); 1♀, Kanagawa Pref., Yamakita Town, Mt. Komotsurushiyama 7. VI . 2013, T . Taniwaki leg. (FIT) (KPMNH); 1♀, Shizuoka Pref., Umegashima 2–17. VI . 2001, T . Sugiyama leg. (MU); 3♀, Aichi Pref., Toyohashi City, Ishimaki, Ege 14. X. 2018, S. Morishita leg. ( TMNH) ; 1♀, Aichi Pref., Shinshiro City, Tsukudeiwanami 17. V . 2019, K. Watanabe leg. (TMNH); 1♀, Aichi Pref., Toyota City, Sanage 15. IV.–21. IV. 2002, M. Kiyota leg. ( MT) ( MU) ; 1♀, Aichi Pref., Toyota City, Takiwaki, 13–19. V . 2002, Y. Kurahashi leg. (MT) (MU); 1♀, Aichi Pref., Nis- shin City, Komenogi 28. V .–3. VI . 2011, H. Seo leg. (MT) (MU); 1♀, Gifu Pref., Kani City, Katabira 1–7. V . 2004, K. Ito leg. (MT) (MU); 6♀, ditto, 15–21. V . 2004 ( MT) ( MU) ; 1♀, ditto, 29. V .–4. VI . 2004 (MT) (MU); 1♀, ditto, 12–18. VI . 2004 ( MT) ( MU) ; 1♀, Mie Pref., Taiki Town , Nishiki 1–7. V . 2007, M. Nakaseko leg. (MT) (MU); 1♀, Nagano Pref., Outaki Vil., Mt. Ontakesan 5. VIII. 2015, K. Watanabe leg. ( KPMNH) ; 1♀, Ishikawa Pref., Haku- san City, Mt. Sannomiya 24. IV–2. V . 2009, H. Fukutomi leg. (MT) (MU); 1♀, Hyogo Pref., Kobe City, Nadaku, Rokkosan-cho , Mt. Aburakobushi 16. X. 2011, S. Fujie leg. ( KPMNH) ; 1♀, Kagawa Pref., Takamatsu City, Enza-cho, Right bank of Kato river 5. V . 2011, S. Fujie leg. (KPMNH); 1♂, Hokkaido, Kamikawa Town, Sounkyo 17. VII. 1968, M. Suwa leg. ( SEHU) ; 1♂, Hokkaido, Horokanai Town , Moshiri, Uryu, 17. VI . 2012, M. Ito leg. (KPMNH); 1♂, Tokyo, Ome City, Mt. Otsukayama 1. VI . 2008, K. Watanabe leg. (KPMNH); 1♂, Tokyo, Ome City, Hikawa 1. VII. 2007, K. Watanabe leg. ( KPMNH) ; 1♂, Kanagawa Pref., Kamakura City, Kamakura 16. X. 1986, H. Nagase leg. ( KPMNH) ; 1♂, Kanagawa Pref., Hadano City, Mt. Koubouyama 30. IV. 2009, K. Watanabe leg. ( KPMNH) ; 1♂, Kanagawa Pref., Yamakita Town, Mt. Hinokiboramaru 17. VIII. 2014, T . Taniwaki leg. (KPMNH); 1♂, Shizuoka Pref., Higashiizu Town , Inatori 31. V . 2009, T . Muraki leg. (KPMNH); 1♂, Ishikawa Pref., Tsurugi- machi, Mt. Shiritaka 27. V . 1988, J. Togashi leg. (NIAES); 1♂ (holotype of D. pilosus ), Hyogo Pref., Sasayama 30. V . 1955, S. Momoi leg. (SEHU); 1♂, Hyogo Pref., Kasai City, Uzurano-cho, Farm of Kobe Univ. 29. IV. 2011, S. Fujie leg. ( KPMNH) .

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Distribution.­­ Japan (Hokkaido, Honshu, Izuoshima Is., Shikoku, and Kyushu); widely distributed in Palearctic region.

Bionomics. A single hoverfly species, Episyrphus balteatus (De Geer, 1776) , has been recorded as the host in Japan ( Kusigemati, 1986).

Remarks.­­ The female specimens of D. scutatorius from Japan are very similar to the character states of this species proposed by Klopfstein (2014), although the face of some Japanese males have black areas (i.e., black ex- cept for longitudinal yellow stripes along inner orbit and a median yellow spot, but the spot is sometimes absent) (entirely yellow in Western Palearctic species and some Japanese specimens). In this study, we conclude that the variation is intraspecific variation of this species.