Dimophora nigra, Omatsu & Konishi, 2023

Omatsu, Yuji & Kazuhiko Konishi, 2023, Revision of the genus Dimophora Förster (Hymenoptera: Ichneumonidae: Cremastinae) from Japan, Zootaxa 5278 (3), pp. 537-554 : 544-549

Dimophora nigra n.­­­sp.

Figs 10–18, 22–24, 39

♀: Head (Figs 10, 11) 1.3–1.4 times as wide as long; POL/OD=1.3–1.6, OOL/OD=1.0–1.2, width of temple/ OD=1.5–1.9; face 2.1–2.3 times as wide as long; clypeus 1.6–1.8 times as wide as long; tentorial pit located on the vental part of lower margin of eye; malar space 0.6–0.7 times as long as basal mandibular width; antenna with 32or33 flagellomeres, 1st flagellomere 1.1–1.3 times as long as 2nd, which 4.1–4.6 times as long as wide.

Mesosoma (Fig. 12) 1.4–1.6 times as long as high; mesoscutum 0.9–1.0 times as long as wide; scutellum 0.7–0.8 times as long as wide; propodeum (Fig.18) with anterior transverse carina between area basalis and area superomedia occasionally absent, area superomedia 0.5–0.6 as long as area petiolaris; scutellum and area superomedia relatively sparsely punctate.

Wings. Fore wing (Fig. 16) 4.2–4.9 mm long, 2.5–2.9 times as long as wide; 2rs-m 0.8–0.9 times as long as 3rsm; 1st abscissa of vein M 0.8–0.9 times as long as 2nd; areolet 0.8–1.0 times as long as wide; stigma 2.4–2.9 times as long as wide; sub-basal cell with setae becoming gradually sparse toward base. Hind wing (Fig. 17) with 5 or 6 distal hamuli; basal about 1/2 of sub-basal cell without setae; 2nd abscissas of CU and AA present.

Legs (Fig. 12). Fore tibial spur 0.3–0.4 times as long as 1st tarsomere, which 10.4–11.4 times as long as wide; Hind tibia 1.7–1.9 times as long as 1st tarsomere. Hind femur 4.4–4.8 times as long as high.

Metasoma (Fig. 12). T1 2.1–2.4 times as long as apical width, 1.5–1.7 times as long as T2; petiole 2.0–2.3 times as long as wide; postpetiole 0.9–1.1 times as long as wide; T2 0.7–0.8 times as long as wide. Ovipositor length 2.1mm long, 1.9–2.0 times as long as hind 1st tarsomere.

Color. Head black; mandible dark brown around middle; antenna black. Mesosoma black. Tegula brown. Legs with coxae and trochanters black. Fore leg brownish yellow; 5th tarsomere dark brown. Middle leg brownish yellow; basal 1/3 of femur blackish; 5th tarsomere dark brown. Hind leg dark brown; femur black except basal and apical portions. Wings hyaline and tinged with brown; veins pale brown; stigma brown. Metasoma black; 1st sternite black. Ovipositor black.

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

Head (Figs 13, 14) 1.2–1.4 times as wide as long; POL/OD=1.4–1.8, OOL/OD=0.9–1.1, wide of temple/ OD=1.7–1.9; face 1.7–2.4 times as wide as long; clypeus 1.8–1.9 times as wide as long; malar space 0.6–0.9 times as long as basal mandibular width; antenna with 31–35 flagellomeres, 1st flagellomere 1.2–1.5 times as long as 2nd, which 3.8–4.8 times as long as wide.

Mesosoma (Fig. 15) 1.5–1.6 times as long as high; mesoscutum 0.9–1.0 times as long as wide; scutellum 0.7–0.9 times as long as wide; propodeum with area superomedia 0.4–0.6 as long as area petiolaris.

Wings. Fore wing 4.3–4.9 mm long, 2.4–2.7 times as long as wide; 2rs-m 0.7–0.9 times as long as 3rs-m; 1st abscissa of vein M 0.8–1.1 times as long as 2nd; areolet 0.8–1.2 times as long as wide; stigma 2.3–2.9 times as long as wide.

Legs (Fig. 15). Fore tibial spur 0.3–0.4 times as long as 1st tarsomere, which 8.7–11.6 times as long as wide; Hind tibia 1.6–2.0 times as long as 1st tarsomere. Hind femur 4.1–5.0 times as long as high.

Metasoma (Fig. 15). T1 2.3–2.6 times as long as apical width, 1.6–2.2 times as long as T2; petiole 1.6–2.0 times as long as wide; postpetiole 0.8–1.1 times as long as wide; T2 0.6–0.8 times as long as wide; penis valve (Figs 23, 24) with strong spines.

Type­­­ series.­­­ Holotype. ­­­ ♀. “ 33°57’30”N 134°25’24”E, Ôkawara, Sanagouchi-son, Tokushima, Shikoku, JAPAN, 8–17. viii, 2016, Malaise trap, K. Ôhara ” ( EUM) . Paratypes. ­­­ Numanotaira , Mt. Asakusa-dake , Tadami, Fukushima, Honshu, JAPAN, MsT., 1♀ 3♂ (13. viii–13. ix, 2020), Y. Okatsu & Y. Nakano ( EUM) ; Kawamata , Ôtakimura , Chichibu-gun, Saitama, Honshu, JAPAN, 1♂ (6. vii, 2004), A. Shimizu ( EUM) ; Komagatake (1000– 1300m) Hakone, Kanagawa, Honshu, JAPAN, 1♀ (11. viii, 2000), H. Nagase ( EUM) ; Inonedani (1120m), Arimine, Toyama, Honshu, JAPAN, MsT., 2♂ (1–8. ix, 2009), M. Watanabe et al. ( EUM) ; Shima (800m), Shirakawa-mura, Gifu, Honshu, JAPAN, MsT., 4♂ (1–8. ix, 2009), 7♂ (24–31. viii, 2010), 2♂ (13– 24. ix, 2010), 1♂ (29. ix–6. x, 2010), R. Sugiura & H. Sumi ( EUM) ; Kurakake-tôge , Fujiwara-cho , Inabe, Mie, Honshu, JAPAN, 1♀ 1♂ (7. vii, 2014), 1♂ (24. vii, 2014), 1♂ (31. viii, 2014), A. Kawazoe ( EUM) ; Meotoike , Mt. Tsurugi-san, Tokushima, Shikoku, JAPAN, 2♂ (22–23, vii, 2017, Light trap), J. Okayasu ( EUM) ; Asono , Shonai, Oita, Kyushu, JAPAN, 1♀ (4. ix, 1996), R. Matsumoto ( OMNH).

Distribution.­­­ Japan (Honshu, Shikoku, Kyushu) (Fig. 39)

Etymology.­­­ The specific name is from the black body color.

Remarks.­­­ This species is similar to D. nitens (Fig. 38) and D. japonica (Figs 3, 6) in body size. However, D. nigra is different from D. nitens in the following character states, OOL 0.8–1.2 times as long as OD (Figs 10, 13), hind leg dark brown, metasoma black, T1 1.5–1.7 times as long as T2, and ovipositor length 2.1 mm and 1.9–2.0 times as hind 1st tarsomere length (Figs 12, 15). While in D. nitens , OOL is 1.6 times as long as OD (Figs 36, 37), hind legs is yellowish brown, metasoma is reddish brown, T1 is 2.4 times as long as T2, ovipositor is 3.8 mm long and 3.1 times as long as hind 1st tarsomere (Fig. 38). And this species can be distinguished from D. japonica by the positional relationship between tentorial pit and lower margin of eye (Figs 2, 5, 11, 14), the coloration of female antenna (Figs 3, 12), the density of punctures on scutellum and area superomedia (Figs 9,18) and the strength of spines on penis valve (Figs 21,24).