Aridelus dubius Belokobylskij, 1981

Fujie, Shunpei & Maeto, Kaoru, 2022, The genus Aridelus Marshall (Hymenoptera, Braconidae, Euphorinae) from Japan, with description of a new species, ZooKeys 1092, pp. 105-122 : 105

Aridelus dubius Belokobylskij, 1981

Fig. 1A-G

Aridelus dubius Belokobylskij, 1981: 44. [Type locality: Russia]

Material.

Japan Honshû: 1♀, Niigata Pref., Myoukou City, Suginosawa, Sasagamine , 36-52N/138-4E, about 1200-1335 m alt., 18.IX.2013, S. Shimizu leg. (OMNH) ; 1♀, same data except 36-52-2N/138-4-42E, about 1300 m alt., 14.IX.2013, LT. (NARO) ;. 1♀, Hiroshima Pref., Shôbara City, Saijô Town, Mts. Hiba , Tachieboshi Parking Lot , 30-31.VII.2019, LT., S. Shimizu leg (OMNH) .

Description.

Females (N = 3) (Fig. 1 ). Body length 5.1-6.1 mm.

Head (Fig. 1B, C, D, E ). Width of head 2.0-2.2 × median length and 1.0 × width of mesonotum. Length of eye 1.1-1.3 × length of temple in dorsal view. OOL / OD = 4.0-4.1. POL / OD = 1.7. Vertex and temple densely punctate. Occipital carina complete. Frons smooth and shiny, with a distinct median carina. Face 1.8 × as wide as high; finely punctate. Intertentorial distance / tentorio-ocular distance = 0.4-0.5 ×. Clypeus finely punctate, slightly concave medially, without apical teeth. Length of malar space 0.4-0.5 × eye height. Malar suture distinct. Antenna filiform with 18 segments; 3rd segment 3.8-4.0 × longer than wide and 1.3 × longer than 4th one; penultimate one 1.6-1.7 × longer than wide.

Mesosoma. Mesosoma areolate, 1.3 × as long as high. Scutellum without median smooth area.

Wings (Fig. 1F ). Fore wing 4.4-4.7 mm in length, 1-R1 / length of pterostigma = 1.3-1.4, r / 3-SR = 2.3-3.5, m-cu slightly postfurcal. Hind wing with 1r-m / 2-SC+R = 0.7-0.9.

Legs (Fig. 1G ). Hind leg: femur 4.1-4.3 × longer than wide, length of femur: tibia: basitarsus = 1: 1.3: 0.6.

Metasoma. Metasoma smooth and polished. First metasomal tergite 6.0 × longer than its apical width. Hypopygium truncated and excised apically. Ovipositor sheath hardly exserted beyond apex of metasoma.

Colour. Black. Palpi, antenna entirely, mandible, tegula, legs except for telotarsus and first metasomal tergite dark reddish brown; remainder of metasoma reddish brown, telotarsus and veins dark brown; pterostigma pale in basal 1/5 or faintly pale basally. Fore wing hyaline with two fuscous bands. Hind wing with a fuscous band in its apical third.

Distribution.

Japan ( Honshû: Niigata and Hiroshima Prefectures); Russian Far East ( Belokobylskij 1981, 2000).

Hosts.

Unknown.

Remarks.

This species was described with only the male holotype available. The Japanese specimens mostly agree well with the original description ( Belokobylskij 1981) and run in the key by Belokobylskij (2000) to A. dubius . The redescription of this species based on Japanese female specimens is represented here.

This species resembles A. rutilipes Papp described from Taiwan (Fig. 6 ) but differs in having the distinct malar suture (absent in Aridelus rutilipes ), the palpi dark reddish brown (light reddish brown in Aridelus rutilipes ), the apical hyaline area of the fore wing comparatively small, not reaching the apex of marginal cell (Fig. 1F ) and the apico-posterior edge of the fore wing (in Aridelus rutilipes comparatively large, almost reaching the apex of marginal cell and reaching the apico-posterior edge (Fig. 6A )), and the metasoma reddish brown to dark reddish brown (Fig. 1A ) (dark brown in Aridelus rutilipes (Fig. 6A )).

Figures

Figure 1. Aridelus dubius Belokobylskij, 1981, ♀ from Niigata Prefecture, Japan A habitus B head, frontal view C head, dorsal view D basal antennal segments E apical antennal segments F wings G hind femur.

Figure 6. Aridelus rutilipes Papp, 1965, ♀ from Taiwan A habitus B head, dorsal view C apical antennal segments.