Discoelius brevilamellatus Wang, Chen & Li

Wang, Hua-Chuan, Chen, Bin & Li, Ting-Jing, 2019, A new species and new record of the genus Discoelius Latreille, 1809 (Hymenoptera Vespidae: Eumeninae) from China, Zootaxa 4686 (2), pp. 297-300: 297-299

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Discoelius brevilamellatus Wang, Chen & Li

sp. nov.

Discoelius brevilamellatus Wang, Chen & Li  , sp. nov.

( Figs 1–7View FIGURES 1–7)

Material examined. Holotype, 1 ♀, CHINA: Tibet, Changdu City, Mangkang County, Rumei Town , Jueba Village , 29°34′51″N, 98°18′12″E, 3240m, 23.VII.2014, Tingjing Li & Chunfa ChenGoogleMaps  . Paratype: 1 ♀, same label as holotype.

Diagnosis. Female ( Fig. 1View FIGURES 1–7). This species differs from other members of the genus by the following combination of characters: clypeus punctate and interspaces between punctures on lateral side somewhat striate ( Fig. 2View FIGURES 1–7), dorsal surface of propodeum ( Fig. 6View FIGURES 1–7) with thin longitudinal striae on the basal and lateral half and irregularly reticulate on the apical portion (dorsal surface of propodeum almost uniform and regularly reticulate in D. aurantiacus  ) and T2–T4 with apical lamella short, not reflexed ( Fig. 7View FIGURES 1–7).

Description. Female ( Fig. 1View FIGURES 1–7). Body length 12.4–14.2 mm, fore wing length 11.2–12.2 mm. Black, with the following parts orange: two spots on the base of mandible and inner upper margin of antennal socket, large spot on apical half of clypeus, half of dorsolateral surface of pronotum, apical bands on both T1 and T2 ( Figs 1, 2View FIGURES 1–7); wings brown, veins dark brown ( Fig. 1View FIGURES 1–7).

Head. Head in frontal view as wide as high ( Fig. 2View FIGURES 1–7), with brown setae and dense punctures, length of setae about 2× as long as posterior ocellar diameter ( Fig. 3View FIGURES 1–7); mandible with four teeth; clypeus punctate and interspaces between punctures on lateral side somewhat striate, 1.5× as wide as high, its apical margin almost truncated, width of truncation 0.3× width of clypeus between inner eye ( Fig. 2View FIGURES 1–7); gena as wide as eye; punctures on vertex and gena slightly sparser than those on frons; occipital carina developed at lateral side ( Fig. 3View FIGURES 1–7); antennal scape with small punctures, 2.7× as long as its width, A3 1.1× as long as its maximum width, A4–A11 wider than long, A12 bullet-shaped ( Fig. 4View FIGURES 1–7).

Mesosoma. Mesosoma about 1.5× as long as wide, with setae and punctures; pronotal carina complete, pronotum with coarse punctures, its lateral low surface with weak striae ( Fig. 5View FIGURES 1–7); mesoscutum in lateral view weakly convex ( Fig. 5View FIGURES 1–7), with dense punctures and area between punctures slightly striate ( Fig. 1View FIGURES 1–7); notaulix complete, posterior area between the notaulices weakly punctate ( Fig. 1View FIGURES 1–7); tegula smooth on center portion, its anterior and posterior lobes punctate, and its posterior lobe sharp and developed exceeding parategula posteriorly; scutellum with medial longitudinal furrow and punctures ( Fig. 6View FIGURES 1–7); dorsal portion of mesopleuron coarsely punctate and area between punctures more or less carinate and ventral one sparsely punctate and area between punctures smooth ( Fig. 5View FIGURES 1–7); metapleuron with weak and oblique striae in dorsal portion and without distinctly striae and punctures in ventral one ( Fig. 5View FIGURES 1–7); propodeum dull, bearing lateral carina, with densely longitudinal and thin striae on basal half of dorsal surface and irregularly reticulate striae on apical half, posterior surface with median longitudinal carina and irregular striae ( Fig. 6View FIGURES 1–7), and its lateral surface with dense, weak and oblique striae ( Fig. 5View FIGURES 1–7).

Metasoma. T1 with coarse punctures, those on lateral side denser and bigger, and interspaces between punctures somewhat striate ( Figs 1, 7View FIGURES 1–7), T1 about 2× as long as its maximum width, widening at one-fifth of the tergum from base, in lateral view abruptly swollen from near base; apexes of T2–T4 with very short lamellae, not reflexed ( Fig. 7View FIGURES 1–7); T2 about 1.1× as long as wide dorsally, punctures on T2 minute and distinctly smaller than those of T1, those on basal portion dense and then gradually sparser from base to apex, T2 not petiolate at base ( Figs 1, 7View FIGURES 1–7); punctures on S2 larger than those on T2, and those on lateral portion slightly denser; punctures on T3–T6 slightly larger than those on T2.

Variation. S2 with apical interrupted band in paratype.

Male. Unknown.

Distribution. China (Tibet).

Remarks. This species is allied to D. aurantiacus Nguyen, 2016  from Vietnam by similar color pattern, mesoscutum with dense punctures ( Fig. 1View FIGURES 1–7), and T 1 in lateral view abruptly swollen from near base.

Etymology. The specific name brevilamellatus  is from the Latin brev- (= short) + lamellatus (= lamella), which refers to T2 – T4 with apical short lamellae.