Rheocricotopus (Psilocricotopus) serratus Liu, Lin & Wang 2014

Rheocricotopus (P.) serratus Liu, Lin & Wang, 2014 Fig. 7, Table 6 Rheocricotopus (Psilocricotopus) serratus Liu, Lin & Wang, 2014a: 28. Rheocricotopus (Psilocricotopus) brachypus [nec Wang & Zheng, 1991] – Liu et al. 2014a: 19. Type material Holotype of Rheocricotopus (P.) serratus CHINA – Yunnan • ♂; Dali, Eryuan, Niujie, Mici River; 26°25′ N, 99°98′ E; 25 May 1996; C.F. Zhou leg.; BDN, BDN 10058. Other material examined CHINA – Hubei • 1 ♂; Hefeng; 29°91′ N, 110°3′ E; 16 Jul 1999; B.C. Ji leg.; NK, NK 13894 [labelled “ Rheocricotopus (Psilocricotopus) brachypus ”]. – Xizang • 1 ♂; Nyingchi, Bayi, Shergmla Mountain; 29°64′ N, 94°36′ E; 28–30 Sep. 1997; T. Solhøy and J. Skartveit leg.; NK, NK 005 [labelled “ Rheocricotopus (Psilocricotopus) brachypus ”]. – Anhui • 1 ♂; Anhui, Lu’an, Jinzhai, Qingshan; 31°26′ N, 115°56′ E; 180 m a.s.l.; 2 May 2014; H.Q. Tang leg.; JNU. – Guangdong • 1 ♂; Fengkai, Heishiding NNR; 23°30′ N, 111°47′ E; 315 m a.s.l.; 20 Mar. 2021; H.Q. Tang leg.; JNU. – Yunnan • 1 ♂; Ruili, Mengxiu, Mengxiu Reservoir; 24°30′ N, 97°43′ E; 1675 m a.s.l.; 26 Oct. 2016; H.Q. Tang leg.; JNU, JNU 161124020 • 1 ♂; Pingbian, Daweishan National Forest Park, stream; 22°54′ N, 103°42′ E; 2150 m a.s.l.; 5 Jun. 2017; H.Q. Tang leg.; JNU, JNU 170613013 • 1 ♂; Jinping, Ma’andi, 22°46′ N, 103°31′ E; 1350 m a.s.l.; 8 Jun. 2017; H.Q. Tang leg.; JNU, JNU 170723008 • 1 ♂; Dali, Cangshan National Geopark, Qingbi Stream, Tianque Bridge; 25°39′ N, 100°09′ E; 2350 m a.s.l.; 20 May 2018; H.Q. Tang leg.; JNU, JNU 181210050 • 1 ♂; same data as for preceding; 14 Feb. 2022; X.F. Li leg.; JNU. – Sichuan • 1 ♂; Huili, Liuhua; 27°05′ N, 102°23′ E; 1540 m a.s.l.; 26 Apr. 2021; J.Y. Shi leg.; JNU, JNU 21092021. Description Male (n = 8) Total length 2.5–3.2, 2.9 (7) mm. COLOURATION. Body mostly dark brown. Thorax dark brown with somewhat paler pleural membrane; HP pale yellow; scutal vittae indistinct. Abdominal tergites and legs brown. HEAD. Temporals 3–4, 4 (7). AR 0.56–0.88, 0.78. Clypeus with 10–15, 13 setae. Lengths (μm) of Pm 1–5: 30–39, 35 (7); 44–59, 53 (7); 91–130, 111 (7); 128–172, 154 (6); 209–276, 245 (7), respectively. Pm 4 / Pm 3 1.1–1.6, 1.4 (5); Pm 5 /Pm 4 1.4–1.8, 1.6 (6). Pm 3 with 1–4, 2 (7) SCl. THORAX. Lateral Aps 3–6, 5 (7); Ac 7–18, 12 (7), longest 12–20, 17 (7) μm long; Dc 5–10, 7 (7), including 0–1, 0 (7) H; Pa 3 (7); Scts 4–11, 8 (6). HP (Fig. 7A) oval, moderately large. WING (Fig. 7B). Length 1.6–2.3, 2.0 mm. C extension slightly projected, 30–42, 36 (7) μm long. VR 1.1 (7). R with 3–6, 4 setae; R 1 bare; R 4+5 0–3, 1 seta. AnL obtuse. Sq with 8–15, 10 setae. LEGS. P 1 with ti spur 42–52, 48 μm long; P 2 with 2 ti spurs 15–25, 20 and 15–22, 19 μm long; P 3 with 2 ti spurs 44–54, 50 and 17–25, 20 μm long. P 2 with 0–3, 2 (7) Sch on ta 1. P 3 with ti comb of 11–16, 13 (6) bristles. Lengths and proportions of legs as in Table 6. ABDOMEN. Hypopygium (Fig. 7C) with AnP pointed apically, bearing 6–8, 7 (7) lateral setae. Gc 185– 221, 205 μm long, 3.2–3.8, 3.5 (6) × as long as broad at middle, with SVo triangular, thin; IVo triangular, apically blunt. Gs (Fig. 7D) 74–89, 84 μm long, with CD narrow, relatively large, and triangular. HR 2.21–2.72, 2.46. Female, pupa and larva Unknown. Distribution This species has been known from several provinces in Oriental China. Remarks The species was described based on males from Yunnan, Zhejiang and Sichuan provinces, and Xizang Autonomous Region. In the original description, the authors (Liu et al. 2014a: 29 fig. 15) drew a huge, sawtooth-shaped crista dorsalis as occupying the apical half of gonostylus. Although they regarded the strange crista dorsalis as a discriminator of the species from the other members of this genus, a closer re-examination of the holotype disclosed that the specimen is teneral and armed with a moderately large, sharped, tooth-like crista dorsalis on the subapex of gonostylus. Further, we re-examined two voucher specimens (NK 13894, NK 005) identified as R. (P.) brachypus Wang & Zheng, 1991 by Liu et al. (2014a: 19). It was concluded that these belong to R. (P.) serratus, not to R. (P.) brachypus, mainly because of the higher values of antennal ratio (AR 0.93 in NK 13894, 0.67 in NK 005) and the LR 1–3 (0.86, 0.61 and 0.62, respectively in NK 13894; 0.82, 0.61 and 0.61, respectively in NK 005), the oval, large humeral pit, and the simple, triangular inferior volsella. The morphological features of this male are consistent with those of males newly collected from Yunnan, Sichuan, and Anhui provinces in Oriental China. The male is characterized by the moderately large, oval humeral pit; the antennal ratio less than 1.0, but more than 0.5; the scutum with distinct acrostichal setae; the wing with an obtuse anal lobe and a slight costal extension; the triangular, thin superior volsella; and the relatively large, usually sharped tooth-like, crista dorsalis. The male is similar to that of R. (P.) chapmani (Edwards, 1935) in having the large and ovoid humeral pits, a scutum with distinct acrostichal setae, a triangular crista dorsalis, but separable by the lower antennal ratio (AR 0.56–0.88) and the higher foreleg ratio (LR 1 0.75–0.86). According to Saether (1986: 77), in R. (P.) chapmani the antennal ratio is 1.18–1.29 and the LR 1 is 0.70–0.74.