Tiphia (Jaynesia) rotunda Han, Chen & Li, sp. nov.

(Figs 22–30)

Diagnosis. This species can be recognized by the following combination of characters: posterior margin of tegula without transverse impressed line (Fig. 25), lateral carina of propodeum obsolete (Fig. 26), S1 (Fig. 28) without lateral groove on posterior half, and T2 1.7× wider than long and its lateral margin rounded (Fig. 22).

Material examined. Holotype, ♂, China, Gansu prov., Zhangye City, Linze County, Xinhua Town, Xiaoquanz- itan Village, 39°2′48″N, 99°9′35″E, 1394 m, 27.VI.2019, Xue Zhang (CNU).

Description. Male (Fig. 22). Body length 5.27 mm. Forewing length 4.0 mm. Black with erect long whitish setae, with flagellum, tegula, tibiae, tarsi, pterostigma and wing venation brown; mandible reddish brown; coxae and femora dark brown; wings translucent (Figs 22–23, 25).

Head. Mandible without distinct medial transverse groove, at most with obsolete intermittent impressed line; W: OW: L: IOD=40: 16: 21: 25; OOD: POD: Od=12: 13: 6; AOD: WAS: IAD: CL: CAW=26: 20: 11: 25: 18; clypeus (Fig. 23) with dense punctures and evenly distributed, ventral margin medially convex and slightly emarginated in middle, lateral margin convex, without thickened; frons (Fig. 23) without one medial longitudinal narrow groove or carina; upper frons with sparse punctures; lower frons with denser punctures; vertex (Fig. 24) with sparse and small punctures on lateral side of ocellus, postocellar area relatively smooth, rare punctures, upper anterior-ocellus with sparse and small punctures, with interspaces smooth.

Mesosoma. Pronotal dorsal face with sparse and small punctures, almost evenly spaced (Fig. 25); pronotal lateral face ventrally with dense oblique striae; mesoscutum with notaulus and dense punctures; mesopleuron with dense and minute punctures; metanotal trough and metascutellum with sparse and small punctures (Fig. 26); lateral carina of propodeum obsolete, and posteriorly with short striae connecting transverse carina; propodeal areola slightly convergent posteriorly, APWL=1.58: 0.9: 1.63, medial longitudinal carina reaching posterior 1/2 of areola; surface of propodeal areola medially flat and smooth (Fig. 26); propodeal lateral face anteriorly with long dense oblique wrinkles, posteriorly with dense and minute punctures, without short medial longitudinal carina; tegula (Fig. 25) smooth, with erect long whitish setae on its anterior and inner margin, without transverse impressed line; forewing (Fig. 22) with pterostigma, and apex of marginal cell not exceeding the second submarginal cell.

Metasoma. T1 (Figs 22, 27) with sparse punctures, subposterior groove with a row of minute punctures; S1 (Fig. 28) smooth and impunctate, and without posterolateral groove and medial carina; T2 (Fig. 22) 1.7× wider than long, and its lateral margin rounded, anteriorly with transverse row of short longitudinal striae; T1–T7 with erect long whitish setae; T2–T6 with sparse punctures (Fig. 22); T1–T6 posteriorly with thin lamellae; posterior margin of S2–S5 with sparse recumbent long whitish setae; S5 (Fig. 29) with lateral denticle, nearly longitudinal and slightly curved inwards, without distinct hollow; T7 (Fig. 30) with one medial longitudinal impunctate area.

Female. Unknown.

Distribution. China (Gansu).

Remarks. This species is similar to T. (J.) borealis Chen & Yang, 1990 by having the following character states: pronotal lateral face ventrally with dense oblique striae; mesoscutum (Fig. 25) with notaulus and dense punctures; apex of marginal cell of forewing not exceeding the second submarginal cell; T2–T6 (Fig. 22) with sparse punctures. However, this new species differs from it by having the lateral carina of propodeum obsolete; propodeal areola slightly convergent posteriorly, medial longitudinal carina reaching posterior 1/2 of areola (Fig. 26); S1 smooth and impunctate (Fig. 28); T2 1.7× wider than long, and its lateral margin rounded (Fig. 22).

Etymology. The specific name rotunda is derived from a Latin adjective rotundus (= round), referring to the lateral margin of T2 that is rounded in dorsal view.