Omalus tibetanus, Wei, Na-sen, Rosa, Paolo, Liu, Jing-xian & Xu, Zai-fu, 2014

Wei, Na-sen, Rosa, Paolo, Liu, Jing-xian & Xu, Zai-fu, 2014, The genus Omalus Panzer, 1801 (Hymenoptera, Chrysididae) from China, with descriptions of four new species, ZooKeys 407, pp. 29-54 : 48-51

Omalus tibetanus sp. n. Plates 15, 16

Material examined.

Holotype: ♀ (SCAU), Tibet, Chayu, Cibagou (28°55'0.59"N, 97°27'2.22"E), 3200 m, 22.VI.2009, Jiang-li Tan, No. 200902083.

Diagnosis.

Omalus tibetanus sp. n. is related to Omalus probiaccinctus sp. n. based on the distinctly elongate metasoma; to Omalus berezovskii Semenov-Tian-Shanskij based on the deep notauli. However, Omalus tibetanus sp. n. can be distinguished from them by the combination of the following characters: mesoscutum polished (transversally rugulose in Omalus probiaccinctus sp. n.); T-III median notch shallowly indented (median notch deeply V-shaped in Omalus berezovskii , slightly in Omalus probiaccinctus sp. n.); metasoma distinctly elongate (pear-shaped in Omalus berezovskii ).

Description.

Female. Body length 4.5 mm (Plate 15). Forewing length 3.9 mm. POL: OOL: OCL = 2.0: 2.7: 2.5. MS = 0.9 MOD.

Head. Face with large, round, dense (0-0.5 PD), shallow punctures (Plate 16A). Scapal basin deep, with upper half smooth, glabrous; lower half weakly and obliquely striae laterally (Plate 16A). Ocellar triangle isosceles. Postocellar line absent (Plate 16B). Gena with oblique wrinkles.

Mesosoma. Pronotum almost impunctate medially (Plate 16B); with small, deep pits on anterior margin; with large, dense (0-0.5 PD) punctures laterally (Plate 16B). Mesoscutum polished, almost impunctate (Plate 16D); notauli distinct, deep, complete; notaulic pit elongate; parapsidal line shallower than notauli (Plate 16D). Scutellum without flattened fovea on anterior margin; with broad, impunctate median area extending along its full length (Plate 16D); shallowly areolate punctate laterally, becoming deeper, larger towards alar foveae (Plate 16D). Mesopleuron without striae between punctures (Plate 16C). Metanotum evenly round, large, deep, areolate-punctate (Plate 16D). Propodeum with lateral margin concave before propodeal angle; propodeal angle distinct, long, pointing posterolaterally (Plate 16D). Tarsal claw with three teeth.

Metasoma. Distinctly elongate, L/W = 13/9, with T-III slightly constrict laterally towards the apex (Plate 16E). T-I and T-II almost impunctate. T-III with fine, scattered punctures (Plate 16E); apex of T-III with narrow (1/2 MOD), testaceous transparent rim, with median notch shallowly indented (Plate 16F).

Colouration. Face metallic green, with some yellowish and violet tints on lower face between antennal socket. Vertex metallic blue, with purple laterally near the eye. Antenna black, with scape and pedicel metallic green. Mesosoma metallic bluish-green. Tegula metallic bluish-green, with apex blackish-brown. Leg metallic greenish-blue, with tarsus brown. Metasoma metallic blue, with purple reflections.

Male. Unknown.

Distribution.

China (Tibet).

Biology.

Unknown. Collected in June.

Etymology.

The species is named after the type locality.