Trichrysis tonkinensis ( Mocsáry, 1914 )

Nguyen, Lien Thi Phuong, Wiśniowski, Bogdan, Tran, Ngat Thi, Tran, Duong Dinh & Rosa, Paolo, 2022, Two new species of Trichrysis Lichtenstein (Hymenoptera: Chrysididae) from Vietnam and China, with taxonomic notes on other species from the Oriental region, Zootaxa 5194 (1), pp. 133-143 : 139-142

Trichrysis tonkinensis ( Mocsáry, 1914)

( Figs 16–28 )

Chrysis (Trichrysis) tonkinensis Mocsáry, 1914: 25 . Holotype, ♀ [not ♂], Vietnam: Tonkin (HNHM) (examined).

Material examined. 1♀: VIETNAM: Tonkin China / tonkinensis Mocs. det. Mocsáry typ. <handwritten in red> / red label / Holotypus Chrysis tonkinensis Mocs . ♀ RM Bohart / id. nr. 135549 HNHM Hym. coll. ( HNHM) . 2 ♀: VIETNAM; Cao Bang, Nguyen Binh, Quang Thanh / Hoai Khao , Phia Oac-Phia Den NP / 879 m a.s.l.; 10.v.2021 / 22°36′39″N 105°54′40″E / [leg.] NTPL, NQC, TTN ( IEBR) . 3 ♀: VIETNAM; Ha Tinh, Vu Quang / Vu Quang NP , Khe Che RS / 18°24′33″N 105°18′39″E, 32 m a.s.l. / 20.iv.2022, NTPL, TTN .

Diagnosis. Middle-sized species with robust, densely punctate body; colouration mostly golden-green with some olive-green colour on interstices of vertex and mesosoma and blue colour dorsally ( Figs 18, 20 , 25, 27 ). Ocellar triangle with dark brownish interstices; dorsal part of pedicel metallic copper. Sublateral, longitudinal carina in pronotum fully developed ( Figs 16, 18 , 23, 25 ). TFC raised, straight, medially as an acute angle, laterally bent close to eye margin ( Figs 17 , 22 ). Tegula brown to predominantly metallic green; outer margin partly brownishblack. T1 and T2 bright blue dorsally, golden-green laterally and apically. T2 with weak median carina, almost reaching posterior margin ( Figs 20 , 26 ). Median tooth on apex of T3 sharp and pointed ( Figs 19 , 26 ). S2 black spots trapezoid, fused medially, forming black mark wider than its length ( Fig. 28 ).

Redescription. Female ( Figs 16–28 ). Body length 6.5–7.0 mm.

Head. Scapal basin deep and punctate, medially with punctures partly fused forming transverse striae ( Figs 17 , 23 ). Brow prominent, TFC single, medially slightly inverted V-shaped, recurved laterally. Brow raised between TFC and scapal basin, polished medially, with elongated shallow punctures. Surface of brow above TFC flattened, with dense punctures. BOL 1.5 × MOD. Relative length of P:F1:F2:F3=1.0:2.0:1.2:1.0; F1 l/w=2.6; OOL 1.9 × MOD; POL 2.0 × MOD; MS = MOD; clypeal apex arcuate medially. Mandible simple, without subapical tooth. Malar space with few medium punctures, and with genal carina reaching up to 2/3 of head height. Setae on vertex whitish, not longer than MOD. Ocellar triangle obtuse ( Fig. 24 ).

Mesosoma. Median pronotal line moderately deep, not extending to posterior margin of pronotum. Sublateral carina on pronotum fully developed ( Figs 16, 18 , 23, 25 ). Punctation on pronotum, mesoscutum and mesoscutellum with variable interstices, 0.2–0.8 × PD; interstices shining and micropunctate. Mesepisternum with large punctures, interstices narrow, 0.1–0.5 × PD. Episternal sulcus and scrobal sulcus with large areolate punctures, about 1.8 × as large as punctures on mesepisternum ( Fig. 16 ). Setae on outer edge of metatibia short, not longer than half their distal width.

Metasoma. Metasoma densely punctate; punctures smaller than on mesosoma. Interstices on T1 and T2 0.2–1.0 × PD, polished, almost smooth, with only scattered tiny punctures. T2 with weak median carina, almost reaching posterior margin. T3 punctate and wrinkled before prepit bulge ( Fig. 19 ); prepit bulge slightly convex ( Fig. 26 ); pits large, apical rim wrinkled ( Figs 19 , 26 ). Median tooth on apex of T3 sharp and pointed, lateral teeth shorter ( Figs 19 , 26 ). Interval between median tooth and lateral tooth broadly incurved. S2 black spots trapezoid, fused medially, forming black mark wider than its length ( Fig. 28 ).

Colouration. Body metallic golden green, with some dark brown to olive or blue reflections on pronotum, mesoscutum, mesoscutellum, metanotum and laterally on mesosoma. Terga golden green. Median blue spots on mesoscutum small. Scape metallic green, dorsal part of pedicel metallic copper, rest of flagellum black. Tegula brown in the holotype ( Fig. 18 ), yet predominantly metallic green in recently collected specimens, with only outer margin partly brownish-black. Wings slightly infuscate. Legs metallic bright green, basitarsi greenish, rest of tarsi blackish.

Male. Unknown.

Distribution. Northern and central Vietnam (Cao Bang & Ha Tinh Provinces).

Remarks. The Chinese specimen identified as Trichrysis tonkinensis and illustrated in Rosa et al. (2016) resulted undescribed (see below T. sinica ), and we here provide the images of the holotype of T. tonkinensis photographed at HNHM ( Figs 16–21 ).

Trichrysis tonkinensis is similar to T. chamchuensis Wiśniowski & Nguyen in Wiśniowski et al. (2020) but can be differentiated from the latter by the following characters: BOL 1.5 × MOD, F1 l/w=2.6, OOL 1.9 × MOD (vs. BOL 1.7 × MOD, F1 l/w=3.0, OOL 1.4 × MOD in T. chamchuensis ); malar space with few medium punctures (vs. few small punctures); interstices of T1 and T2 narrower, 0.2–1.0 × PD (vs. 0.6–1.2 × PD); T2 with weak median carina, reaching approximately one-third to apex of T2 (vs. T2 with distinct median carina, reaching apex of T2); pits large, not fused into pair of elongated holes on both sides of median keel (vs. pits fused into pair of elongated holes on both sides of median keel); S2 black spots trapezoid (vs. S2 black spots almost triangle); dorsal part of pedicel metallic copper (vs. pedicel metallic green).

Figures

FIGURES 16–21. Trichrysis tonkinensis (Mocsáry, 1914), holotype, ♀. 16. Head, mesosoma and T1, lateral view. 17. Head, frontal view. 18. Mesosoma and T1, dorsal view. 19. T2 and T3, posterior view. 20. Metasoma, dorsal view. 21. Metasoma, ventral view. Scale bar = 1 mm.

FIGURES 22–28. Trichrysis tonkinensis (Mocsáry, 1914), ♀ from Vietnam: Cao Bang, Nguyen Binh, Quang Thanh. 22. Head, frontal view. 23. Head and mesosoma, lateral view. 24. Head, dorsal view. 25. Head and mesosoma, dorsal view. 26. T2 and T3, posterior view. 27. Metasoma, dorsal view. 28. Metasoma, ventral view. Scale bar = 1 mm.