Dimophora japonica, Omatsu & ---, 2023

Omatsu, Yuji & Kazuhiko Konishi, 2023, Revision of the genus Dimophora Förster (Hymenoptera: Ichneumonidae: Cremastinae) from Japan, Zootaxa 5278 (3), pp. 537-554 : 539-543

Dimophora japonica n.­­­sp.

Figs 1–9, 19–21, 39

♀: Head (Figs 1, 2) 1.2–1.3 times as wide as long; POL/OD=1.2–1.5; OOL/OD=0.9–1.3; width of temple/OD=1.5– 2.1; face 1.9–2.3 times as wide as long; clypeus 1.5–1.9 times as wide as long; tentorial pit located on the dorsal part of lower margin of eye; malar space 0.4–0.5 times as long as basal mandibular width; antenna with 29–32 flagellomeres, 1st flagellomere 1.1–1.3 times as long as 2nd, which 3.6–4.7 times as long as wide.

Mesosoma (Fig. 3) 1.6–1.7 times as long as high; mesoscutum 0.9–1.1 times as long as wide; scutellum 0.6–0.8 times as long as wide; propodeum (Fig. 9) with area superomedia 0.5–0.7 as long as area petiolaris.

Wings. Fore wing (Fig. 7) 3.3–4.7 mm long, 2.5–3.0 times as long as wide; 2rs-m 0.5–0.9 times as long as 3rsm; 1st abscissa of vein M 0.8–1.4 times as long as 2nd; areolet 0.7–0.9 times as long as wide; stigma 2.4–2.9 times as long as wide; sub-basal cells with setae becoming gradually sparse toward base. Hind wing (Fig. 8) with 5 or 6 distal hamuli; basal around 1/2 of sub-basal cell without setae; 2nd abscissas of CU and AA present.

Legs (Fig. 3). Fore tibial spur 0.3–0.4 times as long as 1st tarsomere, which 9.2–12.0 times as long as wide; Hind tibia 1.5–1.9 times as long as 1st tarsomere. Hind femur 3.8–5.4 times as long as high.

Metasoma (Fig. 3). T1 2.3–3.0 times as long as apical width, 1.4–1.7 times as long as T2; petiole 1.3–1.5 times as long as wide; postpetiole 1.0–1.3 times as long as wide; T2 0.7–0.9 times as long as wide. Ovipositor 2.2–2.7 mm long, 2.0–2.5 times as long as hind 1st tarsomere.

Color. Head black; mandible dark brown except teeth; apical margin of malar space sometimes dark brown; antenna with 1st to 14–15th flagellomeres brownish yellow, 15–16th to apical flagellomeres black. Mesosoma black. Tegula yellowish brown. Fore and mid legs brownish yellow; 5th tarsomeres brown. Hind leg reddish brown; coxa darker ventrally. Wings hyaline and tinged with pale brown; veins pale brown; stigma brown. Metasoma dark brown; around basal 1/4 and apical 1/4 of T1, T2 and around basal 1/2 of T3 reddish brown; 1st sternite reddish brown. Ovipositor black.

♂: Agrees with the above-mentioned description of the female, except for the following character states:

Head (Figs 4, 5) 1.1–1.2 times as wide as long; POL/OD=1.4–1.8, OOL/OD=0.9–1.3, width of temple/OD=1.5– 2.1; face 1.7–2.4 times as wide as long; clypeus 1.4–2.2 times as wide as long; malar space 0.5–0.6 times as long as basal mandibular width; antenna with 29–32 flagellomeres, 1st flagellomere 1.1–1.3 times as long as 2nd, which 3.3–4.7 times as long as wide.

Mesosoma (Fig. 6) 1.5–1.7 times as long as high; mesoscutum 0.9–1.1 times as long as wide; scutellum 0.6–0.9 times as long as wide; propodeum with area superomedia 0.5–0.7 as long as area petiolaris.

Wings. Fore wing 3.8–4.4 mm long, 2.3–2.8 times as long as wide; 2rs-m 0.6–0.9 times as long as 3rs-m; 1st abscissa of vein M 0.9–1.3 times as long as 2nd; areolet 0.7–0.9 times as long as wide; stigma 2.1–2.9 times as long as wide.

Legs (Fig. 6). Fore tibial spur 0.3–0.4 times as long as 1st tarsomere, which 8.6–11.4 times as long as wide; Hind tibia 1.6–2.0 times as long as 1st tarsomere. Hind femur 3.8–5.3 times as long as high.

Metasoma (Fig. 6). T1 2.1–2.9 times as long as apical width, 1.4–1.7 times as long as T2; petiole 1.6–2.0 times as long as wide; postpetiole 1.0–1.3 times as long as wide; T2 0.8–1.0 times as long as wide; penis valve (Fig. 20, 21) with weak spines.

Color. Antenna dark brown. Hind leg with coxa dark brown to reddish brown. Metasoma blackish brown; around basal 1/4 and apical 1/7 of T1, basal and apical portions of T2 and basal portions of T3 reddish brown.

Type­­­ series.­­­ Holotype. ­­­ ♀. “ 40°31’N 140°10’E Kawaratai , Nishimeya-mira , Aomori , Honshu, JAPAN, 25. vii–6, viii, 2013, Malaise trap, T. Nakamura ” ( EUM) . Paratypes. ­­­ Mt. Teineyama , Sapporo, Hokkaido, JAPAN, 1♀ (10. viii, 1979), M. Kotani ( EUM) ; Houheikyo , Sapporo, Hokkaido, JAPAN, 2♂ (11–12. viii, 1979), M. Kotani ( EUM) ; Kannon-zawa (42°58’N 141°15’E), Sapporo, Hokkaido, JAPAN, 5♂ (24. viii–7. ix, 1993, MsT.), N. Kuhara ( NIAES) , 1♂ (7–21. ix, 1993, MsT.), N. Kuhara ( NIAES) , 1♀ 5♂ (25. vii–1. viii, 2000, MsT.), K. Uesugi ( SEHU) , 2♀ 1♂ (22. vii–7. viii, 2002, MsT.), T. Yoshida ( SEHU) , 1♀ (8. viii, 2008, yellow pan trap [stream side]), T. Yoshida & P. Tripotin ( SEHU) ; Misumai , Sapporo, Hokkaido, JAPAN, 1♀ (27. vii–13. viii, 1994, MsT.), N. Kuhara ( EUM) ; Hyakumatsu-zawa (42°58’N 141°12’E), Sapporo, Hokkaido, JAPAN, 2♂ (14–21. vii, 1998, MsT.), K. Mizota et al. ( SEHU) , 2♀ 3♂ (28. vii–4. viii, 2001, MsT.), T. Yoshida ( SEHU) ; Kôzan-chô , Noboribetsu, Hokkaido, JAPAN, 1♂ (28. vii, 2002), T. Yoshida ( SEHU) ; Moheji , Kamiiso-chô, Hokkaido, JAPAN, 1♀ (2. viii, 2002), T. Yoshida ( SEHU) ; Hitsujigaoka (43°00’N 141°24’E), Sapporo, Hokkaido, JAPAN, MsT., 3♀ (9–22. viii, 2002, EUM) , 1♀ 71♂ (26. vi–2. viii, 2007, EUM) , 1♂ (14–21. vii, 2008, EUM), 1♀ 9♂ (21–28. vii, 2008, EUM) , 1♀ 2♂ (28. vii–4. viii, 2008, SEHU) , 4♀ 29♂ (4–11. viii, 2008, EUM) , 3♂ (24–31. vii, 2009, EUM), 2♂ (7–14. viii, 2009, EUM), 23♂ (25. vii–1. viii, 2011, EUM), K. Konishi; same locality, MsT., 1♀ (1. viii, 2008), P. Tripotin & T. Yoshida ( SEHU) ; Shumarinai (44°17’56”N 142°09’31”E 270m), Horokanai, Kamikawa, Hokkaido, JAPAN, MsT., 1♂ (3–19. viii, 2016), T. Ito ( EUM) ; Kawaratai (40°31’N 140°10’E), Nishimeya-mira, Aomori, Honshu, JAPAN, MsT., 42♂ (21–30. vi, 2013), 13♀ 116♂ (25. vii–6, viii, 2013), 1♀ (6–14, viii, 2013), T. Nakamura ( EUM) ; Numanotaira , Mt. Asakusa-dake , Tadami, Fukushima, Honshu, JAPAN, MsT., 3♂ (12. vii–13. viii, 2020), 1♂ (13. viii–13. ix, 2020), Y. Okatsu & Y. Nakano ( EUM) ; Inonedani (1120m), Arimine, Toyama, Honshu, JAPAN, MsT., 1♂ (1–8. ix, 2009), M. Watanabe et al. ( EUM) ; Takayama (35°57’N 137°29’E), Gifu, Honshu, JAPAN, 1♂ (4. viii, 2019), K. Kuroda ( EUM) .

Distribution.­­­ Japan (Hokkaido, Honshu) (Fig. 39)

Etymology.­­­ The specific name is derived from its distribution in Japan.

Remarks.­­­ This species is similar to D. nitens in terms of the body size (Fig. 38). However, D. japonica can be distinguished from the later by the following combination of character states, OOL 0.9–1.3 times as long as OD (Figs 1, 4), length of malar space 0.4–0.6 times as long as basal mandibular width (Figs 2, 5), female antenna with 1st to 14–15th flagellomeres brownish yellow, length of fore tibial spur 0.2–0.3mm, fore and mid coxae brownish yellow, hind leg reddish brown, hind coxa reddish brown to dark brown, T1 1.4–1.7 times as long as T2, metasoma dark brown and length of ovipositor 2.0– 2.7mm and 2.0–2.5 times as long as hind 1st tarsomere (Figs 3, 6). While in D. nitens, OOL is 1.6 times as long as OD (Fig. 36), length of malar space is 0.8 times as long as basal mandibular width (Fig. 37), antenna is all black, length of fore tibial spur is 0.4 mm, hind leg is yellowish brown, all coxae are black, metasoma is reddish brown, T1 2.4 is times as long as T2 and ovipositor is 3.8 mm long and 3.1 times as long as hind 1st tarsomere (Fig. 38).

Moreover, this species can be distinguished from Palearctic congeners by the tentorial pit, which is located at level dorsad of lower margin of eye (Figs 2, 5, 11, 14, 26, 34, 37).