Pseudorthocladius (Pseudorthocladius) binarius Ren, Lin & Wang 2014

Adult male (n = 4). Total length 1.50–1.80, 1.63 mm. Wing length 0.81–0.97, 0.89 mm. Total length/wing length 1.83–1.86, 1.84. Wing length/length of profemur 2.26–2.43 (3). Coloration. Head, abdomen, legs brown; thorax with yellow ground with brown postnotum and preepisternum. Head. Antenna with 13 flagellomeres. Terminal flagellomere length 95–108, 105 μm. AR 0.28–0.33, 0.29. Temporal setae 8 (2), including 2 (2) inner verticals, 3–4 (3) outer verticals, and 2 (2) postorbitals. Clypeus with 6–10, 8 setae. Tentorium 86–96, 92 μm long, 14–19, 15 μm wide. Palpomere lengths (in μm): 19–24, 22; 26–29, 28; 55–62, 59; 84–91, 86; 98–120, 110. L: 5th/3rd 1.77–2.10, 1.86. Wing (Figure 1). VR 1.25–1.29 (3). Anal lobe reduced. Brachiolum with 1 seta; R with 9–15, 13 setae; R1 with 1–4, 2 setae; R4+5 9–11, 10 setae; M with 0–1, 1 seta. Squama with 1–2, 1 seta. Costal extension 70 μm long. Cu1 slightly curved. Thorax (Figure 2). Antepronotum with 3–6, 5 lateral setae, dorsocentrals 13–15, 13, acrostichals 3–7, 5, prealars 4–6, 5. Scutellum with 6–8, 7 setae. Legs. Pulvilli present. Spur of fore tibia 29 (3) μm long, spurs of mid tibia 22–24, 23 μm and 16–19, 18 μm long; hind tibia with a long spur 40–43, 42 μm long, a short spur 14–17, 16 μm long and comb composed of 10–12, 11 spines. Width at apex of fore tibia 24–28, 26 μm, of mid tibia 20–26, 24 μm, of hind tibia 31–36, 33 μm. Lengths (in μm) and proportions of legs as in Table 1. Lengths (in μm) and proportions of legs of Pseudorthocladius (Pseudorthocladius) binarius sp. n. p1 p2 p3 fe 350–400 (3) 350–400, 375 360–400, 380 ti 340–420 (3) 350–430, 373 410–500, 435 ta1 250–300 (2) 125–150, 131 220–260, 240 ta2 170–210 (2) 72–96, 78 115–130, 124 ta3 120–140 (2) 60–72, 63 105–126, 115 ta4 72–84 (2) 36–48, 42 48–60, 53 ta5 51–67 (2) 48–50, 49 48–60, 54 LR 0.71 (2) 0.33–0.37, 0.35 0.52–0.56, 0.55 BV 2.22–2.30, 2.29 3.63–3.98, 3.71 2.98–3.13, 3.02 SV 2.73–2.80, 2.76 5.53–5.72, 5.62 3.32–3.50, 3.41 BR 2.50–2.60, 2.56 3.14–3.67, 3.45 3.75–4.38, 4.03 Hypopygium (Figures 3–7). Laterosternite IX with 4–6, 5 setae. Anal point (Figure 5) subtriangular with rounded apex, 24–26, 25 μm long, with 13–15, 14 strong setae. Phallapodeme 22–24, 24 μm long. Transverse sternapodeme 44–50, 48 μm long. Virga absent. Gonocoxite 110–122, 118 μm long. Inferior volsella (Figure 6) with two sub–lobes, the dorsal lobe with concave inner margin and 4–5, 5 marginal setae, the ventral lobe semi–rounded with 3–4, 3 marginal setae. Gonostylus (Figure 7) 60–67, 64 μm long, narrowed at base. Megaseta 9–10, 10 μm long. HR 1.82–1.92, 1.85. HV 2.43–2.48, 2.45. Female, pupa and larva unknown.

The new species is collected in a subtropical mountain area in Fujian Province (Oriental China).