Eridolius xui Reshchikov,

Reshchikov, Alexey, 2018, Review of the genus Eridolius Förster from the Oriental Region (Hymenoptera, Ichneumonidae, Tryphoninae), Zootaxa 4377 (3), pp. 431-443: 432-436

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Eridolius xui Reshchikov

sp. nov.

Eridolius xui Reshchikov  , sp. nov.

Figs 1–12View FIGURES 1–5View FIGURES 6–11View FIGURE 12

Type material. Holotype, female, CHINA: Guangdong, Huadu, Wangzishan Forest Park, 23°34'30.8"N 113°12'49.5"E, sweep net, 20.V.2006, leg. Jie Zeng, Zaifu Xu & Liqiong Weng ( SCAU).GoogleMaps 

Diagnosis. This species can be distinguished from all other Oriental species of the genus by the following characters: lower mandibular tooth longer than upper one ( Fig. 3View FIGURES 1–5), malar space 0.3 × as long as basal width of mandible, face entirely black ( Fig. 1View FIGURES 1–5), coxae, hind femur and metasoma (except yellowish posterior margins of T2– T7) reddish ( Figs 5View FIGURES 1–5, 10, 11View FIGURES 6–11). This species is similar to the Palaearctic species, E. astenoctenus Kasparyan, 1984  and E. lionyx Kasparyan, 1984  , but differs by longer T1 (1.6 × as long as apically broad, Fig. 7View FIGURES 6–11) and entirely black face and clypeus ( Fig. 1View FIGURES 1–5).

Description. Female. Length of body 6.82 mm. Length of fore wing 5.14 mm.

Head. Flagellum with 24 flagellomeres, about as long as fore wing, its two basal flagellomeres 0.95 × as long as maximum diameter of eye; first flagellomere 5.0 × as long as wide at apex. Head not narrowed posteriorly ( Fig. 2View FIGURES 1–5); length of gena in middle 0.84 × transverse eye diameter; cheek convex below eye; gena smooth. Face with a weak median bulge ( Fig. 1View FIGURES 1–5), smooth and evenly covered with rather fine and sparse punctures, the average distance between punctures 3.0 × their diameter. Frons smooth, with distinct punctures that are finer and sparser than those on face. Clypeus distinctly separated from face by depression, smooth, without punctures ( Fig. 1View FIGURES 1–5); its lower margin obtuse with a comb of setae ( Fig. 3View FIGURES 1–5). Malar space 0.3 × as long as basal width of mandible. Upper mandibular tooth distinctly shorter than lower one ( Fig. 3View FIGURES 1–5); mandible not swollen before base, smooth, without punctures, with defined transverse depression at base ( Fig. 3View FIGURES 1–5). Hypostomal carina not raised behind mandibles ( Fig. 6View FIGURES 6–11).

Mesosoma. Pronotum smooth, epomia present ( Fig. 6View FIGURES 6–11). Mesoscutum with fine, moderately dense punctures ( Fig. 8View FIGURES 6–11). Mesopleuron (except for speculum) with uniformly fine and moderately dense punctures ( Fig. 6View FIGURES 6–11); speculum large, covering about 0.75 × length of mesopleuron, polished part below mesopleural pit expands to posterior corner of mesopleuron. Scutellum rather finely punctate ( Fig. 6View FIGURES 6–11). Metapleuron smooth without punctures. Propodeum shining, rather pubescent with long, dense white setae, smooth without punctures; basal area rather short; costulae distinct; areola pentagonal, apical area 0.4 × as long as basal area and areola combined ( Fig. 9View FIGURES 6–11). Pterostigma nearly 4.0 × as long as wide ( Fig. 4View FIGURES 1–5). Areolet not petiolate ( Fig. 4View FIGURES 1–5). Fore wing with cu-a postfurcal. Hind wing with cu-a intercepted below the middle. Fore claws with 7 teeth. Hind femur 4.8 × as long as wide; proportion of the length of hind tarsomeres 1 to 5: 1.9: 0.8: 0.6: 0.16: 0.6; hind claw with 5 teeth.

Metasoma. T1 1.6 × as long as apically broad with median dorsal carinae extending to 0.65 its length, the space between carinae smooth and impunctate; dorso-lateral carinae defined, up to apical 0.6 ( Fig. 7View FIGURES 6–11). T1 (beyond spiracles) and T2 completely smooth and more or less evenly covered with distinct punctures, average distances between punctures equal to 1–2 × their diameter ( Figs 11View FIGURES 6–11).

Color. Head black ( Figs 1, 2View FIGURES 1–5, 6View FIGURES 6–11). Antenna with flagellum brown basally and reddish apically, scape yellowish ( Figs 1, 5View FIGURES 1–5). Mandible brown, with teeth blackish-brown ( Fig. 3View FIGURES 1–5). Mesosoma black ( Figs 5View FIGURES 1–5, 6, 8, 9View FIGURES 6–11), with posterior half of scutellum yellowish-brown ( Fig. 8View FIGURES 6–11). Tegula and suprategular edge of mesopleuron yellowish-brown ( Fig. 8View FIGURES 6–11). Legs reddish-brown with fore and middle coxae and all trochanters yellowish-brown ( Fig. 5View FIGURES 1–5). Metasoma reddish-brown ( Figs 5View FIGURES 1–5, 10, 11View FIGURES 6–11), with anterior 3/4 of T1 black and posterior 1/4 yellowish-brown ( Fig. 7View FIGURES 6–11).

Male. Unknown.

Etymology. The species named after Prof. Zaifu Xu ( SCAU).

Distribution: China (Guangdong).