Eurycryptus sakaguchii (Uchida, 1932)

Kyohei Watanabe, 2019, Taxonomic and Zoogeographical Notes of Japanese Cryptinae (Hymenoptera, Ichneumonidae), with Description of Five New Species, Bulletin of the Kanagawa Prefectural Museum (Natural Science) 48, pp. 81-113 : 93

Eurycryptus sakaguchii (Uchida, 1932)

( Figs. 2A, D , 3E , 7A–G, I–K )

Torbda (Neotorbda) sakaguchii Uchida, 1932a: 153 .

Gerdius iriomotensis Kusigemati, 1986: 91 . Syn. nov.

Description. The original description of this species ( Uchida, 1932a) lacks some important character states. Thus, I redescribe this species below.

Female (n=3). Body length 8.2–11.0 mm, polished, covered with silver setae.

Head 0.65–0.7 times as long as wide. Clypeus 0.5 times as long as wide, almost flat, largely smooth, its anterior margin concave medially. Face 0.55–0.6 times as long as wide, almost flat, sparsely punctate. Frons slightly concave above antennal socket, smooth except for dorsal part sparsely punctate. Occipital carina complete, its lower end joined with base of mandible. MSL 0.4 times as long as BWM. OOL 1.5 times as long as OD. POL 0.7 times as long as OD. Antenna with 22 flagellomeres. F1 1.1 times as long as F2.

Mesosoma. Epomia present, weak and short. Lateral area of pronotum largely smooth, punctate along dorsal margin. Notauli distinct and deep, each posterior end confluent each other. Mesoscutum covered with fine punctures. Scuto-scutellar groove deep, with some longitudinal striae. Scutellum weakly convex, punctate. Epicnemial carina distinct, its dorsal end not joined with anterior margin of mesopleuron and subalar prominence. Mesopleuron largely smooth. Metapleuron punctate. Anterior transverse carina and posterior transverse carina of propodeum complete ( Figs. 2A, D ). Pleural carina absent except for anterior section ( Figs. 2A, D ). Propodeum punctate ( Fig. 2D ). Propodeal apophysis absent ( Figs. 2A, D ). Propodeal spiracle round ( Figs. 2A, D ). Fore wing length 5.8–7.5 mm. Areolet middle-sized, hexagonal, with sides weakly convergent anteriorly. Nervulus based on basal vein. Nervellus intercepted at midpoint. Fore tibia with a bulge except for basal 0.25. Hind femur 5.2–5.6 times as long as maximum depth in lateral view. Hind TS2: TS1, TS3, TS4 and TS5 = 2.0: 4.8, 1.0, 0.6 and 1.4.

Metasoma densely punctate except for T1 ( Fig. 2D ). T1 1.9–2.05 times as long as maximum width, sparsely punctate posteriorly, smooth anteriorly, with a pair of small obtuse (not triangular) teeth at base ( Fig. 2D ). Median dorsal carina of T1 absent. Dorsolateral carina of T1 present basally. T2 0.95 times as long as maximum width, with a basal median triangular convexity ( Figs. 2D , 7C, E, G, K ). T3 with a transverse convexity ( Figs. 2D , 7G, K ). Ovipositor sheath 1.15–1.3 times as long as hind tibia. Apex of ovipositor as Fig. 3E .

Coloration ( Figs. 7A–G, I–K ). Body (excluding wings and legs) black, except for: clypeus, face, all orbits, malar space, gena, mandible except for tip, palpi, collar, median area of pronotum, a median spot of mesoscutum, mesopleuron except for median black area, metapleuron and posterior band of T7 yellow to reddish yellow; ventral area of scape and pedicel, posterodorsal corner of pronotum, scutellum and posterior band of T1–T6 and T8 tinged with reddish brown to yellowish brown; axillae and propodeum more or less tinged with reddish brown; F8–F16 with white band. Blackish area of mesosoma and metasoma sometimes enlarged. Wings hyaline; veins and pterostigma blackish brown to brown except for yellow wing base. Legs yellowish-brown to brown, hind coxa, hind trochanter, hind trochantellus, hind femur and hind tibia partly blackish brown.

Male. Unknown.

Specimens examined. JAPAN: SEHU, F (holotype of Torbda sakaguchii ), Okinawa, 15. IV. 1922, Sakaguchi leg. ; NIAES, F, Okinawa Pref., Ishigakijima Is., 24. X. 1986, M. Yoshida leg. ; SEHU, F (holotype of Gerdius iriomotensis ), Okinawa Pref., Iriomotejima Is., Komi , 6. VII. 1982, K. Kusigemati leg.

Distribution. Japan (Okinawajima Is., Ishigakijima Is.* and Iriomotejima Is.); Taiwan.

Remarks. This is the first record of this species from Ishigakijima Island.

Figures

Fig. 2. Eurycryptus sakaguchii (Uchida, 1932) (A, D, NIAES), Pterocryptus takachihoensis (Momoi, 1966) (B, G, KPM-NK 5000304), Xoridesopus amamiensis sp. nov. (C, KPM-NK 69529; H, KPM-NK 69531), Hedycryptus ohshimensis (Uchida, 1930) (E, L, M, NIAES), Ischnus splendens sp. nov. (F, KPM-NK 69415), Cryptus dianae (Gravenhorst, 1829) (I–K, KPM- NK 69930) and Dihelus hylaevorus (Momoi, 1966) (N, paratype, MNHAH), female ― A–C, propodeum, lateral view; D, propodeum,T1, T2 and T3, dorsal view, punctures on right side and T3 omitted; E–H, T1, dorsal view; I, K, L, T1, lateral (I, L) and ventrolateral (K) view; J, M, cross-section of anterior part of T1, arrows indicate the carinae; N, apex of metasoma, lateral view. ATC, anterior transverse carina; PTC, posterior transverse carina; PC, pleural carina; TT, triangular tooth; DLC, dorsolateral carina; VLC, ventrolateral carina.

Fig. 3. Giraudia japonica sp. nov. (A, B, KPM-NK 69946), Apsilops scotinus (Tosquinet, 1903) (C, KPM-NK 69932), Dihelus hylaevorus (Momoi, 1966) (D, paratype, MNHAH), Eurycryptus sakaguchii (Uchida, 1932) (E, NIAES), Hedycryptus ohshimensis (Uchida, 1930) (F, NIAES), Ischnus splendens sp. nov. (G, KPM-NK 69406), Nematopodius (Nematopodius) montanus sp. nov. (H, KPM-NK 69554),Torbda sauteri Uchida, 1932 (I, KPM-NK 69501),Xoridesopus amamiensis sp. nov. (J, KPM-NK 69529) andX. tokarensis sp. nov. (K, KPM-NK 69548), female ― A–K, apex of ovipositor, lateral view.

Fig. 7. Eurycryptus sakaguchii (Uchida, 1932), NIAES (A–D), SEHU (E–H, holotype of E. sakaguchii; I–L, holotype of Gerdius iriomotensis Kusigemati, 1986), females ― A, habitus, lateral view; B, head, frontal view; C, E, F, I, head, mesosoma and metasoma, dorsal (C, E), lateral (F) and dorsolateral (I) view; D, G, K, metasoma, dorsal view; J, head and mesosoma, lateral view; H, L, labels.