Pseudomegischus notiochinensis Tan & van Achterberg

Tan, Jiang-Li, Fan, Xu-Lei, van Achterberg, Cornelis & Li, Tao, 2015, A new species of Pseudomegischus van Achterberg from China, with a key to the species (Hymenoptera, Stephanidae), ZooKeys 537, pp. 103-110 : 104-107

Taxon classification Animalia Hymenoptera Stephanidae

Pseudomegischus notiochinensis Tan & van Achterberg sp. n. Figures 1-3, 4-13

Type material.

Holotype, ♀ (GSFPM): "China: Jiangxi, Quannan, 8.v.2009, Shichang Li, [reared from branches of] Castanopsis kawakamii Hay.". Paratypes: 3♀8♂ (NWUX, RMNH, GSFPM): same data except collecting date 4, 10, 12 or 18.v.2009, and from Castanopsis kawakamii Hay. or Castanopsis faberi Hance.

Diagnosis.

Head in dorsal view parallel-sided behind eyes (Fig. 10); posterior half of pronotum comparatively low and dorso-posteriorly finely transversely rugose (Fig. 6); first subdiscal cell of fore wing comparatively robust and 2.5-2.9 × longer than wide (Fig. 4); hind coxa with strong and sparse rugae, and without dorsal tooth (Fig. 8); first-third metasomal tergites black or dark brown (Fig. 1); first metasomal segment narrow in lateral view (Figs 1, 2); first tergite 6.0-7.6 × (♀♂) as long as its maximum width and irregularly coarsely transversely rugose (Figs 3, 12).

The new species runs to Pseudomegischus celebensis van Achterberg in the key in van Achterberg (2002), but differs by having the head mainly dark brown (much paler in Pseudomegischus celebensis ), the propodeum regularly scrobiculate (partly rugose), the mesopleuron with large smooth interspaces between medium-sized to small punctures (with larger punctures and narrower interspaces) and the ivory streak of the temple distinct (obsolescent).

Description.

Holotype, female, length of body 16.7 mm, and of fore wing 8.9 mm.

Head. Antenna with 39 segments; frons coarsely obliquely rugose; three anterior coronal teeth large and acute, both posterior ones arcuate and lamelliform, with two small lobe-shaped carinae on each side in front of both posterior ocelli; behind level of coronal area having four curved, progressively smaller carinae followed by rugose area, rugae rather coarse, posteriorly narrowly reaching occipital carina and widely smooth laterally; temple non-angulate (Fig. 10), punctulate but largely smooth and shiny.

Mesosoma. Neck short and robust, transversely rugose, neck at much lower level than middle part of pronotum (Figs 5, 6); middle part of pronotum largely smooth and without a distinct carina posteriorly; propleuron with sparse large punctures, shiny and rather densely setose; mesonotum irregularly foveolate and area between smooth; notauli and median groove distinct; scutellum with some coarse punctures medially, foveolate laterally; axillae coarsely punctate; mesopleuron distinctly convex, convex part foveolate-punctate and covered with long whitish setae, medially convex part of metapleuron rugose and with long whitish setae, anteriorly crenulate and intermediate area smooth; propodeum densely irregularly rugose (Fig. 6).

Wings. Fore wing (Fig. 4): vein 1-M 3.0 × as long as vein 1-SR and curved; vein r ends slightly before level of apex of pterostigma; first subdiscal cell robust, 2.9 × as long as its maximum width, vein cu-a entirely pigmented.

Legs. Hind coxa robust, without tubercle dorsally and with strong and sparse rugae (Figs 7, 8); hind femur widened, sparsely punctate and with whitish setae ventrally and dark brown setae dorsally, area in between punctures smooth and shiny, ventrally with 2 large acute teeth (the anterior one smaller than posterior one) and several denticles in between (Fig. 7); hind tibia 1.1 × as long as hind femur, basal narrow part of hind tibia about 1.2 × as long as widened part, widened part ventrally distinctly obliquely carinate (Fig. 7); hind basitarsus subparallel-sided, length of hind basitarsus 5.3 × as long as wide medially and 3.6 × as long as second tarsal segment (Fig. 7).

Metasoma. First tergite 6.0 × as long as its maximum width (Fig. 12), 1.4 × as long as second tergite, cylindrical, largely smooth except irregular rugae basally and some oblique aciculation after middle of tergite; remainder of tergites smooth and shiny; setose part of ovipositor sheath 1.1 × as long as body and 2.3 × as long as fore wing.

Colour. Black or blackish brown; tegula and palpi dark brown; scapus, pedicellus, malar space, mandible and patch near basal quarter of hind tibia partly brown; base of femora and of fore and middle tibiae and tarsi pale yellowish brown; remainder of fore and middle tibiae brown; veins and pterostigma largely dark brown, but base of pterostigma ivory; wing membrane slightly brownish but fore wing darkened near vein r and below parastigma; ovipositor sheath blackish apically (Fig. 1).

Male. Similar to female, but in most cases much smaller (Figs 2, 3).

Variation. Length of body of ♀ 15-19 mm, of ♂ 8-16 mm; length of fore wing of ♀ 8-11 mm, of ♂ 5-9 mm; antenna of ♀ with 38(1), 39(1), 42(1) or 47(1) segments, of ♂ with 28(2), 29(1), 31(1), 32(2) and 36(2) segments; first metasomal tergite entirely transversely striate or rugose to largely smooth and only basally rugose; hind basitarsus dark brown as hind tibia or brown and paler than hind tibia; length of ovipositor sheath 2.3-2.5 × fore wing.

Distribution.

Oriental: China (Jiangxi).

Biology.

Reared from stems of Castanopsis kawakamii Hay. and Castanopsis faberi Hance infested by Cerambycidae and Siricidae .

Etymology.

Named after the area of origin, “notios” being Greek for “southern”.