Thaia (Niema) xiaguensis sp. nov.

(Figs 5–8, 22–34)

urn:lsid:zoobank.org:act: C7074748-4A16-40D8-B58B-81AB3C8CAB83

Description. Vertex milky yellow, light brownish in middle apically (Figs 5, 7). Face brownish yellow, relatively short, with anteclypeus ovoid (Fig. 8). Pronotum with diamond pattern in middle, posterior part mostly brownish yellow, anterior part lighter, yellowish (Figs 5, 7). Scutellum with anterior part yellow and posterior part milky yellow. (Figs 5, 7). Forewing and hind wing almost transparent (Figs 5, 6).

Abdomen 2S abdominal apodemes very small, extended dorsomesad, not surpassing 3rd sternite (Fig. 22).

Male genitalia. Pygofer lobe with scattered microsetae on main surface, with dorsal appendage and anal processes, immovably fused to dorsal margin. Anal tube process with branch at apex (Fig. 23). Subgenital plate broad at subbasally, provided with three long macrosetae on lateral surface centrally, numerous peg-like small setae along dorsal margin from near middle part to apex; several small fine setae scattered on apical area, dorsal protrusion near base and apex slightly pocket-like (Figs 24, 25). Style nearly thumb-shaped at apex, slender at the end (Figs 26). Aedeagus expanded at base in ventral view, with single long basal process arising from preatrium ventrally, which slim and sinuate, tapering towards apex, gonopore apical on ventral surface (Figs 27, 28). Connective with central lobe expanded, lateral arms slim (Fig. 29).

Female genitalia. Female 7th sternite as in Fig. 30. Valvula I curved dorsad, blade-like apically and sharply narrowed, with finely striated at apex and almost whole dorsal margin (Fig. 32). Valvulae II slightly sinuous, right blade with tiny teeth at apical part dorsally (Fig. 33). Valvula III with apex narrow, apex surface with few small microsetae (Fig. 34).

Specimen examined. Holotype: ♂, CHINA, Guizhou Prov., Huajiang, Xiagu Village, 21 V 2019, coll. Chao Tao & Zhouwei Yuan. Paratypes: 2♂♂, 5♀♀, same data as holotype.

Measurement. Body length ♂ 3.0~3.2 mm; ♀ 3.2~3.4 mm.

Remarks. This species is similar to T. enica Dworakowska (1979) but can be distinguished from the latter by the shorter subgenital plate, shorter aedeagal process, the thumb-shaped style apex expanded in the middle, and the shorter, broader connective with central lobe relatively narrow and lateral arms slim.

Etymology. The new species is named after its type locality, Xiagu, Guizhou Province.