Pseudorthocladius (Pseudorthocladius) paucus Ren, Lin & Wang 2014

Adult male (n = 3). Total length 1.49–1.60 mm. Wing length 0.77–0.92 mm. Total length/wing length 1.74–1.75. Wing length/length of profemur 2.56–2.58. Coloration. Head, abdomen, legs light brown; thorax with light brown ground with brownish black postnotum and preepisternum. Head. Antenna with 13 flagellomeres. Terminal flagellomere length 115–153 μm, conspicuous swollen apically and with strong sensory setae. AR 0.26–0.48. Temporal setae 5–9, including 2–4 inner verticals, 3–5 outer verticals. Clypeus with 7–10 setae. Tentorium 72–84 μm long, 14–19 μm wide. Palpomere lengths (in μm): 22–24; 24–26; 48–55; 60–65; 91–96. L: 5th/3rd 1.62–1.65. Wing (Figure 24). VR 1.15–1.27. Anal lobe obtuse. Brachiolum with 1 seta; R with 4 setae; R4+5 with 0–1 seta; other veins bare. Squama with 0–1 seta. Costa extension 60 μm long. Cu1 slightly curved. Thorax (Figure 25). Antepronotum with 4–6 lateral setae, dorsocentrals 6–9, acrostichals 0–1, prealars 4–6. Scutellum with 6–7 setae. Legs. Pulvilli present. Spur of fore tibia 29–34 μm long, spurs of mid tibia both 17–19 μm long; hind tibia with a long spur 31–33 μm long, a short spur 19–24 μm long and comb composed of 10–12, 11 spines. Width at apex of fore tibia 21–26 μm, of mid tibia 21–24 μm, of hind tibia 24–29 μm. Lengths (in μm) and proportions of legs as in Table 10. Lengths (in μm) and proportions of legs of Pseudorthocladius (Pseudorthocladius) paucus sp. n. p1 p2 p3 fe 320–360 320–380 430–490 ti 340–360 350–380 370–410 ta1 210–250 140–150 200–230 ta2 130–160 72–77 108–120 ta3 108–130 55–62 91–96 ta4 64–67 36–40 41–46 ta5 52–55 41–43 41–48 LR 0.62–0.69 0.35–0.40 0.52–0.56 BV 2.27–2.36 3.88–4.17 3.10–3.54 SV 2.88–3.19 4.79–5.07 3.44–3.65 BR 2.20–2.50 3.20–3.40 3.57–4.00 Hypopygium (Figures 26–30). Laterosternite IX with 3–4 setae. Anal point (Figure 28) subtriangular with round apex, 9–10 μm long and 24–26 μm wide, with 4–5 lateral setae and 2–5 long setae around the base. Phallapodeme 22–24 μm long. Transverse sternapodeme 43–48 μm long. Virga absent. Gonocoxite 77–89 μm long with reduced parallel–sided inferior volsella (Figure 29). Gonostylus (Figure 30) 43–50 μm long, expanded at the apex, crista dorsalis reduced. Megaseta 5 μm long. HR 1.60–1.83. HV 2.90–3.25. Female, pupa and larva unknown.

The new species is known from Hunan Province in Oriental China. Main different characters between Pseudorthocladius (Pseudorthocladius) paucus sp. n. and Pseudorthocladius (Pseudorthocladius) oyabecrassus Sasa, Kawai & Ueno (1988). Pseudorthocladius (Pseudorthocladius) paucus sp. n. Pseudorthocladius (Pseudorthocladius) oyabecrassus Sasa, Kawai & Ueno Body length 1.49–1.60 mm 2.18 mm Acrostichals 0–1 11 Anal point subtriangular with round apex conical, darkly pigment Pulvilli present absent Inferior volsella parallel–sided with a small projection