Rheocricotopus (Psilocricotopus) hanmiensis Niitsuma & Tang, 2026, sp. nov.

Rheocricotopus (P.) hanmiensis sp. nov. urn:lsid:zoobank.org:act: 7FF66C02-2CF4-48CA-AA8A-E2ED13B8CAC4 Fig. 19, Table 17 Diagnosis Male Abdomen bicoloured with tergites I and II largely yellow, each bearing a darkened posteromedial patch; remaining tergites entirely brown. AR ca 0.5. Humeral pit large, circular. Wing cuneiform with a short but distinct costal extension. Superior volsella triangular, thin. Inferior volsella triangular, apically rounded. Crista dorsalis triangular, distinct, placed at subapex of gonostylus. Etymology From the type locality, Hanmi Waterfall in Xizang Autonomous Region, China. Type material Holotype CHINA – Xizang • ♂; Nyingchi, Medog, Beibeng, Hanmi waterfall, No. 3 bridge; 29°14′ N, 95°08′ E; 970 m a.s.l.; 11 Aug. 2015; H.Q. Tang leg.; JNU, JNU 251215A 1. Paratype CHINA – Xizang • 1 ♂; same data as for holotype; JNU. Description Male (n = 2) Total length 2.1–2.4 mm. COLOURATION. Body mostly dark brown; thorax with pale humeral pits. Abdomen (Fig. 19A) bicoloured; T I–II pale brown each with darkened posteromedian patch; T III–IX entirely dark brown. Legs uniformly brown. HEAD. Temporals 2–4. AR 0.47–0.48. Clypeus with 12–13 setae. Lengths (μm) of Pm 1–5: 34–37, 54– 64, 121–162, 128–167, 209–246, respectively. Pm 4 /Pm 3 1.0–1.1, Pm 5 /Pm 4 1.5–1.6. Pm 3 with 1 SCl on subapex. THORAX. Lateral Aps 2–5; Ac 7–8, longest 15 μm long; Dc 4–5, including 0–1 H; Pa 3; Scts 4 (1). HP (Fig. 19B) distinct, moderately large, circular. WING (Fig. 19C). Length 1.7–2.0 mm. C extension moderately produced, 49–52 μm long. VR 1.1. R with 4–6 setae, R 1 with 0–1 seta, R 4+5 bare. AnL much reduced, wing widest at around end of Cu 1. Sq with 3–4 setae. LEGS. P 1 with single ti spur 37–39 μm long; P 2 with 2 ti spurs of equal length, 22 μm long; P 3 with 2 ti spurs 42–49 and 25 (1) μm long. P 2 with 3–5 Sch on ta 1. P 3 with ti comb of 12–13 bristles. Lengths and proportions of legs as in Table 17. ABDOMEN. Hypopygium (Fig. 19D) with AnP pointed apically, bearing 5–6 basal and 6–8 lateral setae. Gc 204–221 μm long with SVo triangular, thin; IVo triangular, apically rounded. Gs (Fig. 19E) 66–71 μm long, roundly convex in outer margin, subapically with CD triangular, distinct. HR 3.10. Female, pupa and larva Unknown. Distribution The new species is known only from the type locality, Xizang Autonomous Region in Oriental China. Remarks The male resembles that of R. (P.) oiraprimus Sasa, 1991 in the large circular humeral pit; the bicoloured abdomen; the low antennal ratio (AR ca 0.5); the cuneiform wing with a short costal extension; the simple, triangular inferior volsella; and the triangular, distinct crista dorsalis. However, the male differs from it in the yellow tergite II with a darkened posteromedial patch, the antepronotum with lateral setae only, and the thin, triangular superior volsella. In R. (P.) oiraprimus, the abdomen has yellow tergite II with lateral and middle longitudinal darkened patches; the antepronotum has both median and lateral setae; and the superior volsella is thick, roundly protruded.