Omalus corrugatus Rosa, Wei & Xu

Rosa, Paolo, Wei, Na-Sen & Xu, Zai-Fu, 2015, Contribution to the genus Omalus Panzer, 1801 of China, with descriptions of two new species (Hymenoptera, Chrysididae), Zootaxa 4013 (1), pp. 67-76 : 69

Omalus corrugatus Rosa, Wei & Xu , sp. nov.

( Figs 1 A–1F)

Material examined. Holotype: ♀, CHINA: Guangdong, Guangzhou, Liuxihe National Forest Park (23°44'31"N 113°47'0"E), 29–31.VIII.2004, leg. Z-f Xu ( SCAU).

Diagnosis. Omalus corrugatus sp. nov. resembles O. timidus ( Nurse, 1902) for body colouration; however it can be easily separated from the latter by weakly wrinkled mesoscutum.

Description. Female. Holotype. Body length 2.9 mm ( Fig. 1 A). Fore wing length 2 mm. OOL = 1.4 MOD; POL = 2.4 MOD; MS = 1.2 MOD; relative length of P:F1:F2:F3 = 1:1:0.8:0.6.

Head. Head with shallow punctures and weak wrinkles on frons and vertex ( Fig. 1 B). In lateral view, the longest distance between genal carina and lower margin of eye is 0.9 MOD. Genal carina bisecting MS, its end almost jointing lower margin of eye (0.2 MOD). Scapal basin deep, smooth and glabrous. Ocellar triangle isosceles. Occipital area beneath ocellar area weakly wrinkled. Postocellar line interrupted medially. Gena without punctures, with fine and oblique wrinkles.

Mesosoma. Pronotum weakly wrinkled, with row of large deep pits on anterior margin, with shallow, spare and small punctures on posterior margin, deeper and denser punctures (0–0.5 PD) on lateral margins ( Fig. 1 C). Mesoscutum with wrinkles ( Fig. 1 C). Notauli distinct and complete, with deep and elongated notauli pits ( Fig. 1 C). Parapsidal furrow indistinct. Lateral field of mesoscutum with row of large punctures along tegula margin. Mesoscutellum with two enlarged anterior foveae, distinctly separated by 1.5 MOD; with weakly wrinkled subtriangular antero-median area; rest of mesoscutellum with large, round and subequal punctures, and wrinkled interspaces on posterior margin ( Fig. 1 D). Metanotum evenly with larger, deeper and irregular areolate punctures ( Fig. 1 D). Mesopleuron and metapleuron fully with large and deep punctures, without elongated punctures or other elongated sculptures on ventral margin. Tarsal claw with three teeth.

Metasoma. T1 impunctate. T2 and T3 almost impunctate, with fine and spare dots close to lateral margins. T1 without semitransparent rim. T2 with narrow semitransparent rim (0.8 MOD). T3 with wider semitransparent rim (1 MOD). Apex of T3 with distinct median notch ( Fig. 1 F).

Colouration. Antenna black, with scape and pedicel metallic blue. Head black, with face metallic blue. Mesosoma bluish-purple, with median area of pronotum, mesoscutum and metanotum black. Tegula blackishbrown. Leg metallic bluish-green, with tarsi brown. Metasoma black with feeble metallic blue reflections on anterio-lateral corners of T1 and lateral margins of T2 and T3.

Male. Unknown.

Distribution. China (Guangdong).

Etymology. The specific name corrugatus is the past participle of the Latin verb corrugo (nominative masculine singular) and refers to the sculpture of mesosoma.

Figures

FIGURE 1. Omalus corrugatus sp. nov., ♀, holotype, Guanzhou. A. Habitus, dorsal view; B. Head, frontal view; C. Head, pronotum and mesoscutum, dorsal view; D. Mesoscutum, mesoscutellum, and metanotum, dorsal view; E. Metasoma, dorsal view; F. T 3, posterior view. Scale bar: mm.