Diplazon pallicoxa Manukyan, 1987

Morishita, Shunsuke & Watanabe, Kyohei, 2021, -- Review- - of- - the- - genus Diplazon- - Nees, -- 1819 -- (Hymenoptera: -- Ichneumonidae Diplazontinae) -- from- - Japan, Zootaxa 4964 (1), pp. 103-122 : 110-112

Diplazon pallicoxa Manukyan, 1987

(Figs 17–21)

Diplazon pallicoxa Manukyan, 1987: 70 .

Diplazon orientalis: Uchida, 1957: 232 . Misident.

Diagnosis. Face covered with dense punctures. Antenna with 16–17 flagellomeres in both sexes. Mesopleuron covered with fine and sparse punctures except for on and below speculum (Fig. 19). Propodeum without carinae except for lateromedian longitudinal carina, posterior part of lateral longitudinal carina, and pleural carina. Lateromedian longitudinal carina sometimes indistinct. Metasoma dorsoventrally depressed. Transverse impressions distinct on T I to T IV. T I 1.00–1.20 × as long as maximum width (in both sexes). T II 0.75–0.90 × as long as maximum width (in both sexes). T II and T III covered with large and dense punctures except for behind transverse impressions largely smooth (Fig. 20). Face black except for a pair of longitudinal stripes along inner orbit yellow in females (Fig. 18), entirely yellow in males (Fig. 21). Scutellum yellow. Mesopleuron entirely black (Figs 17, 19). Coxae yellow (Fig. 17). Hind tibia is banded as “black-white-black” (Fig. 17). Metasoma black except for sometimes posterior transverse stripes of T II and T III yellow.

In this study, we propose the redescription of this species based on Japanese specimens below.

Redescription based on Japanese­­specimens. Female (n=13). Body covered with silver setae.

Clypeus 1.80–2.00 × as broad as high, weakly bilobed at apex (Fig. 18). Face 1.90–2.20 × as broad as high, covered with dense punctures, convex centrally. Maximum width of compound eye 0.50–0.55 × as long as maximum breadth of gena in lateral view. Length of malar space 0.50–0.67 × as long as basal mandibular width. OOL 0.70–0.85 × as long as OD. POL 0.45–0.55 × as long as OD. Antenna with 16–17 flagellomeres. FL I 1.30–1.45 × as long as FL II.

Mesosoma polished. Lateral aspect of pronotum covered with coarse punctures and rugae anteriorly, largely smooth posteriorly. Mesoscutum and scutellum covered with dense punctures. Mesopleuron covered with fine and sparse punctures except for on and below speculum (Fig. 19). Speculum smooth (Fig. 19). Sternaulus weakly impressed. Metapleuron largely smooth. Propodeum without carinae except for lateromedian longitudinal carina, posterior part of lateral longitudinal carina, and pleural carina. Lateromedian longitudinal carina sometimes indistinct. Area petiolaris largely smooth or often covered with irregular rugae. Fore wing length 4.10–5.50 mm. Nervellus intercepted below the middle. Hind femur 4.00–4.30 × as long as maximum depth in lateral view.

Metasoma polished. Transverse impressions distinct on T I to T IV. T I 1.00–1.20 × as long as maximum width, covered with large and dense punctures except for between a pair of basal carinae smooth. T II 0.75–0.90 × as long as maximum width, T II to T IV covered with large and dense punctures except for behind transverse impressions largely smooth (Fig. 20). Ovipositor sheaths covered with setae.

Coloration (Figs 17–20). Body (excluding wings and legs) black except for: clypeus, palpi, mandible except for apex, apical part of malar space, a pair of longitudinal stripes along inner orbit, hind and ventral corner of pronotum, tegula, subtegular ridge, upper part of mesepisternum, shoulder mark of mesoscutum, rarely two stripes on mesoscutum, scutellum, postscutellum, and sometimes posterior transverse stripes of T II and T III yellow. Wings hyaline. Veins and pterostigma tinged with blackish-brown. Legs orange, except for coxae, trochanters, and trochantelli yellow; hind femur reddish-brown with blackish-brown apex; hind tibia is banded as “black-white-black”; hind tarsomeres black.

Male (n=23). Similar to female except for hind femur 4.30–4.70 × as long as maximum depth in lateral view, ventral part of scape, pedicel, and entire face yellow (Fig. 21).

Specimens examined. JAPAN: 1♀, Fukushima Pref., Showa Vil., Mt. Hakaseyama 20. IX –24. X. 1998, T. Muroi leg. ( MT) ( MU) ; 1♀, Kanagawa Pref., Atsugi City, Funako 6. V –7. VI. 2016, Y. Kato & S. Koizumi leg. ( MT) ( KPMNH) ; 1♀, Kanagawa Pref., Atsugi City, Sanda 26. IV. 2008, H. Katahira leg. ( KPMNH) ; 1♀, Kanagawa Pref., Nakai Town, Zoushiki 16. IV. 2019, K. Watanabe leg. ( KPMNH) ; 1♀, Aichi Pref., Toyohashi City, Ishimaki, Kanbata 23. X. 2018, S. Morishita leg. ( TMNH) ; 1♀, Aichi Pref., Toyohashi City, Imure, Takayama 26. V. 2019, S. Morishita leg. ( TMNH) ; 1♀, Aichi Pref., Toyota City, Sanage 15–21. IV. 2002, K. Mizue leg. ( MT) ( MU) ; 1♀, Aichi Pref., Toyota City, Taniwaki 5–11. VIII. 2002, Y. Kurahashi leg. ( MT) ( MU) ; 2♀, Gifu Pref., Kani City, Katabira 29. V –4. VI. 2004, K. Ito leg. ( MT) ( MU) ; 1♀, Ishikawa Pref., Hakusan City, Togadani 18. V –4. VI. 2010, H. Fukutomi leg. ( MT) ( MU) ; 1♀, Hyogo Pref., Onsen Town, Kishida 12. X. 2012, S. Fujie leg. ( KPMNH) ; 1♂, Hokkaido, Ebetsu City, Nopporo 17. VII. 1980, H. Takemoto leg. ( NIAES) ; 1♂, Ibaraki Pref., Tsukuba City, Kannondai 20. IV. 1992, S. Yoshimatsu leg. (LT) ( NIAES) ; 1♂, Tokyo, Ome City, Mt. Mitakesan 1. VI. 2008, M. Gunji leg. ( KPMNH) ; 1♂, Tokyo, Hachioji City, Takaomachi, Hikagesawa to Kokesawa 3. V. 2007, K. Watanabe leg. ( KPMNH) ; 1♂, Tokyo, Okutama Town, Hikawa 1. VII. 2007, M. Irie leg. ( KPMNH) ; 1♂, Kanagawa Pref., Yokosuka City, Mt. Miurafuji 21. VI. 2007, K. Watanabe leg. ( KPMNH) ; 1♂, Kanagawa Pref., Yokosuka City, Mt. Miurafuji to Mt. Takeyama 5. V. 2007, K. Watanabe leg. ( KPMNH) ; 1♂, ditto, 13. VII. 2008 ( KPMNH) ; 1♂, Kanagawa Pref., Atsugi City, Nakaogino 8. V. 2008, H. Katahira leg. ( KPMNH) ; 1♂, Kanagawa Pref., Hiratsuka City, Shonandaira 15. IV. 2008, H. Katahira leg. ( KPMNH) ; 2♂, Kanagawa Pref., Hadano City, Mt. Koubouyama 5. IV. 2007, K. Watanabe leg. ( KPMNH) ; 2♂, ditto, 12. IV. 2008, ( KPMNH) ; 1♂, Kanagawa Pref., Odawara City, Kuno 31. V. 2014, K. Watanabe leg. ( KPMNH) ; 1♂, Aichi Pref., Toyohashi City, Oiwa-cho, Oana 10. IV. 2019, S. Morishita leg. ( TMNH) ; 2♂, Aichi Pref., Toyohashi City, Ishimaki, Ege 14. X. 2018, S. Morishita leg. ( TMNH) ; 2♂, Aichi Pref., Toyokawa City, Mikami 15. IX. 2019, S. Morishita leg. ( TMNH) ; 1♂, Gifu Pref., Yanagiwara 5. V. 1924, ( SEHU) ; 1♂, Kagoshima Pref., Kirishimajingu 10. VI. 1980, K. Ohara leg. ( SEHU) ; 1♂, Kagoshima Pref., Terayama 19. IV. 1973, K. Ohara leg. ( SEHU) . RUSSIA: 1♀ (paratype), Primorsk , 4. VIII. 1972, Kuslitzky leg. ( ZISP) .

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

Bionomics. Unknown.

Remarks. This is the first record of this species from Japan. This species resembles D. ryukyuensis with both species having yellow coxae and the metasoma with large and dense punctures, but they can be distinguished by the following combination of character states in females: the face black expect for a pair of longitudinal yellow stripes along inner orbit (entirely yellow in D. ryukyuensis ); T II 0.75–0.90 × as long as maximum width (0.55–0.70 × as long as maximum width in D. ryukyuensis ). The identification of males is difficult and thus they can be distinguishable only by the structures of mesopleuron (see above key) (Table 1).

Nakanishi (1967) compared D. orientalis with D. ryukyuensis , but provided no description about the data of former species. By the result of our examination, the former species may be D. pallicoxa . According to Nakanishi (1967), “ D. orientalis ” (= D. pallicoxa ) can be distinguished from D. ryukyuensis by the following combination of character states: the median longitudinal impression of frons present (absent in D. ryukyuensis ); sternaulus present (absent in D. ryukyuensis ); blackish antennae and hind legs (blackish antennae and hind legs except for: coxa, trochanter, and trochantellus yellow; femur reddish-brown with blackish-brown apex; central part of tibia white in D. ryukyuensis ). However, the character states of frons and sternaulus are intraspecifically varied and the color of antenna and hind legs are overlapped between both species.