Trichrysis yuani Rosa, Feng & Xu

Rosa, Paolo, Wei, Na-sen, Feng, Jun & Xu, Zai-fu, 2016, Revision of the genus Trichrysis Lichtenstein, 1876 from China, with description of three new species (Hymenoptera, Chrysididae), Deutsche Entomologische Zeitschrift 63 (1), pp. 109-136: 130-131

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Trichrysis yuani Rosa, Feng & Xu

sp. n.

Taxon classification Animalia Hymenoptera Chrysididae

Trichrysis yuani Rosa, Feng & Xu  sp. n. Figs 88-93, 94-95, 107

Material examined.

Holotype, ♀: CHINA: Hubei, Jingmen, Jingshan (31°1 ’1.05’ N 114°7 ’10’’ E), 15.VII.2009, leg. Y. Yuan (SCAU). Paratypes: 1♂, same data as holotype (SCAU); 1♀, Hunan, Huaihua (27°33 ’11’’ N, 109°59'53E), VIII.2004, leg. J-h. Zhou (SCAU); 1♂, Hunan, Mt. Huping, Nianzigou (29°55 ’38” N 110°48 ’48” E), 9.VII.2009, leg. S-h. Wang (SCAU).


Trichrysis yuani  sp. n. is similar to Trichrysis pellucida  (du Buysson, 1887); however it can be separated from the latter by: different shape of T3; distance from anterior margin of pit row to posterior margin of median tooth about 2 MOD (Fig. 88); T3 median tooth blunt in dorsal view (Fig. 93); F1 l/w=3.0; body light blue in both sexes; P entirely metallic; body length about 7.0 mm.


Female. Holotype. Body length 7.0 mm.

Head. Scapal basin deep, punctuate laterally, striate and punctate medially. TFC single, slightly inverted V-shape. Area between TFC and scapal basin raised (Fig. 89). Relative length of P:F1:F2:F3=1.0:1.6:0.9:0.7; F1 l/w=3.0; OOL=1.9-2.4 MOD; BOL=1.5 MOD; POL=1.5-2.0 MOD; MS=1.0 MOD; clypeal apex almost truncate.

Mesosoma. Pronotal groove deep, almost extending to posterior margin of pronotum (Fig. 90); sublateral carina distinct and complete. Metanotum with shallow depression antero-medially. Punctuation on mesosoma dense, with consistent punctures relatively small (about 0.5 MOD), subequally interspaced; interspaces punctate (Fig. 90). Episternal sulcus and scrobal sulcus with large areolate punctures. Hind basitarsus l/w = 4.5.

Metasoma. Punctures on T1 and T2 geminate and punctate on interspaces (Fig. 92); on T1 increasing in diameter toward lateral margins. T2 and T3 with median carina. T3 with coarse punctuation; prepit bulge convex; pit row with remarkably large and deep pits partially fused. Apex of T3 with one blunt median tooth and two blunt angulate lateral teeth; interval between median tooth and lateral tooth straight to slightly convex. S2 black spots enlarged and medially fused (Fig. 107).

Colouration. Body metallic greenish-blue, with dark blue spots on vertex, mesoscutellum and T2. Scape and pedicel greenish-blue, flagellum black. Face with greenish-golden reflections. Tegula blackish-brown, with metallic greenish-blue reflections. Legs metallic greenish-blue, with tarsi black without metallic reflections.

Male. Similar to female (Fig. 94), except for: apex of T3 subtruncate; T3 without prepit bulge; median tooth more blunt (Fig. 95).


China (Hubei, Hunan).


The species is named after the collector of holotype.