Holotype: ♂, China: Gansu Province, Lanzhou City, Shifogou National Forest Park, Shifogou (石佛沟), 17.V. 2015, coll. Meng Wang (IZCAS). Paratypes: 4 ♂♂, 6 ♀♀, same data as holotype (IZCAS).

Figure 1. 

Pseudolathra gansuensis Li & Zhou, sp. nov., morphology A habitus B male sternite VII C male sternite VIII D aedeagus, dorsal view E aedeagus, lateral view F aedeagus, ventral view. Scale bars: 1.0 mm (A); 0.2 mm (B–G).

BL: 4.4–4.6 mm; FL: 2.4–2.5 mm. HL: 0.67 mm; HW: 0.62 mm; PL: 0.73 mm; PW: 0.64mm; EL: 0.93 mm; EW: 0.81 mm; EYL: 0.21mm; POL: 0.25mm.

Body (Fig. 1A) elongate, brownish yellow; legs and antennae pale brown.

Head (Fig. 1A) nearly square, slightly longer than wide and about 1.08 times as long as wide; punctures on vertex of head sparse and coarse, dense around eyes, intervals between punctures larger than diameter of a puncture; eyes big and slightly protruding, postocular portion approximately 0.73–0.76 times as long as eye length.

Pronotum (Fig. 1A) oblong, slightly elongated, 1.14–1.16 times as long as wide, longer and broader than head. Anterior angles visible and posterior angles rounded, both sides straight. Longitudinal midline portion impunctate, both sides with dense and large punctures much denser and coarser than those of head and arranged in two compact rows generally; interstices with fine microsculpture.

Elytra parallel-sided, longer than wide, longer than pronotum; punctures on surface arranged in 7 series in dorsal view; interstices without microsculpture. Hind wings fully developed.

Abdomen approximately as broad as elytra, wider than head or pronotum; punctures very fine and dense; interstices with microsculpture; posterior margin of tergite VII with palisade fringe.

Male. Sternite VII (Fig. 1B) with a slight protrusion in middle, both sides of which slightly notched and surface with short hair slope to middle. Sternite VIII (Fig. 1C) with posterior excision narrow and deep, not quite reaching middle of sternite.

Aedeagus (Fig. 1D–F), AEL= 0.91–0.93 mm long, length/width = 3.29. Dorsal plate fused with median lobe. Ventral process strongly sclerotized and curved ventrally (Fig. 1D–E). Middle lobe with apex round in dorsal or ventral view and internal sac with several strongly sclerotized and acute structures.

The species is known only from Gansu Province and the specimens were collected by light traps.

The new species is similar to P. assingi sp. nov. in habitus, but it can be distinguished from the latter by the deep notch in male sternites VII–VIII (Figs 1B, C, 2B, C), and the characteristics of the median lobe and interior armatures of the aedeagus are distinctly different (Fig. 1E–G).

The new species has a very similar aedeagus to P. pulchella (Kraatz, 1859), whereas the ventral protrusions of the median lobe are thinner than in the latter species. On the other hand, the middle notch of sternite VIII is distinctly deeper and narrower than in P. pulchella (Fig. 1B–C; Assing 2012: 315: figs 33–34; 321: 38–39).

The specific epithet is derived from the type locality, Gansu Province in Northwest China.

Holotype: ♂, China: Gansu Province, Lanzhou City, Shifogou National Forest Park, Shifogou (石佛沟), 17.V. 2015, coll. Meng Wang (IZCAS). Paratypes: 1 ♂, 5 ♀♀, same data as holotype (IZCAS).

Figure 2. 

Pseudolathra assingi Li & Zhou, sp. nov., morphology A forebody B male sternite VII C male sternite VIII D aedeagus, ventral view E aedeagus, lateral view F aedeagus, dorsal view. Scale bars: 1.0 mm (A); 0.2 mm (B–G).

BL: 5.4–5.7 mm; FL: 2.8–3.1 mm. HL: 0.72 mm; HW: 0.72 mm; PL: 0.93 mm; PW: 0.78 mm; EL: 1.12 mm; EW: 0.93 mm; EYL: 0.29 mm; POL: 0.29 mm.

Body (Fig. 1A) elongate, brownish yellow; legs and antennae straw yellow.

Head (Fig. 1A) round, slightly wider than long and about 1.08 times as long as wide; punctures on vertex of head and around the eyes dense and coarse, with intervals between punctures as large as the diameter of a puncture; eyes big and flat, postocular approximately as long as eye.

Pronotum (Fig. 1A) oblong, slightly elongated, 1.09–1.11 times as long as wide, 1.28–1.30 times as long and 1.07–1.09 times as broad as head; both anterior angles and posterior angles rounded, sides straight. Longitudinal midline portion impunctate; punctures on each side dense and larger than those of head and generally arranged in rows; interstices glossy with fine microsculpture.

Elytra parallel-sided, longer than wide, slightly longer than pronotum; punctures on surface arranged in 5 series in dorsal view; interstices glossy with fine microsculpture. Hind wings fully developed.

Abdomen approximately as broad as elytra, wider than head or pronotum; puntures of posterior tergites very fine and dense, whereas basal area with punctures larger than the former; interstices with fine microsculpture; posterior margin of tergite VII with palisade fringe.

Male. Sternite VII (Fig. 1B) with a round notch in middle, prominent on both sides. Sternite VIII (Fig. 1C) with posterior excision narrow and deep and about 2/3 length of this sternite, basal part with a half-fusiform depression.

Aedeagus (Fig. 2D–F). AEL= 1.17 mm, length/width = 2.8. Dorsal plate fused with median lobe. Ventral process with a strongly sclerotized structure, curved ventrally and with apex irregularly formed (Fig. 2D–E). Middle lobe narrow in middle and bilobed posteriorly. Internal sac with several strongly sclerotized structures inside.

The species is known only from Gansu Province and the specimens were collected by light traps.

In addition to being similar to the previous species as described above, P. assingi sp. nov. also closely resembles P. glabra Peng, Li & Zhao, 2014, with differences as follows: 1) the former species has black head and elytra, whereas the latter one has brown head and elytra; 2) the notch of sternite VII, the ventral process, the hooks and the internal sac of the aedeagus differ significantly between the two species (Fig. 2E–G; Peng et al. 2014: 598, fig. 1B, D–E).

The specific epithet is from the given name of entomologist Dr. Volker Assing, in recognition of his great scientific contributions to the Chinese fauna of the genus Pseudolathra.