A new species of Tachycines Adelung, 1902 (Orthoptera, Rhaphidophoridae, Aemodogryllinae, Aemodogryllini) from karst caves in Guizhou, China Author Zhou, Xulin School of Life Sciences, Guizhou Normal University; Guiyang, Guizhou 550031, China & Institute of Karst Caves, Guizhou Normal University, Guiyang, Guizhou 550031, China Author Yang, Weicheng School of Life Sciences, Guizhou Normal University; Guiyang, Guizhou 550031, China & Institute of Karst Caves, Guizhou Normal University, Guiyang, Guizhou 550031, China yangweicheng0908@sina.com text ZooKeys 2020 937 21 29 http://dx.doi.org/10.3897/zookeys.937.49173 journal article http://dx.doi.org/10.3897/zookeys.937.49173 1313-2970-937-21 3449D91205174B148616EB707861552F 07015807C1C35DF6BDC6278D678A01DC Tachycines (Gymnaeta) trapezialis sp. nov. Figures 1 , 2 , 3 , 4 , 5 , 6 Diagnosis. This new species is very similar to T. (G.) lushuicus Qin, Liu & Li, 2019, T. (G.) parvus Qin, Liu & Li, 2019, and T. (G.) bifurcatus Gorochov, 2010, but differs from them in having the epiphallus of the male genitalia trapezoidal, without upper and lower deep notches and the hind tibia provided with 54-60 spines on each side for the new species. In T. (G.) lushuicus Qin, Liu & Li, 2019, the epiphallus of the male genitalia has an upper deep notch, and the hind tibia above has 61-67 spines on each side. In T. (G.) parvus Qin, Liu & Li, 2019, the epiphallus of the male genitalia has an upper and lower deep notch, and the female subgenital plate is triangular. In T. (G.) bifurcatus Gorochov, 2010, the epiphallus is strongly transverse, with a slightly notched upper part and medial projections on the lower part, and with a pair of large, almost oval lateral sclerites in males. Type locality. Holotype , 1♂, Diaosiyan Cave, Ziyun County, Guizhou, 25°35.06'N , 106°12.32'E , 1110-1120 m alt., October 2, 2019, collected by Xulin Zhou; paratypes , 1♀, same data as holotype. Specimens examined. Diaosiyan Cave, Ziyun County, Guizhou Province: nymphs 11♂♂ 10♀♀, June 10, 2019, collected by Xulin Zhou, Juan Liao and Yi Du; 13♂♂ 9♀♀, October 2, 2019, collected by Xulin Zhou, Haixia Luo, Panpan Ren, Meizhen Deng and Suqin Zhao. Sanjiaoshan Cave, Ziyun County, Guizhou Province: 2♀♀, 25°35.35'N , 106°12.31'E , 1109m alt., October 2, 2019, collected by Xulin Zhou, Haixia Luo, Panpan Ren, Meizhen Deng and Suqin Zhao. Description. Male. Body medium-sized (Fig. 5 ). Vertex divided into two conical tubercles (Fig. 1A, B ). Ommateum normal, not reduced; ocelli visible. Legs elongate and slender; fore femur about 1.6-1.8 times longer than the pronotum, ventrally unarmed, internal genicular lobe with a small spine; external genicular lobe with one elongate movable spur; ventral side of fore tibiae with two external spurs and two internal spurs. Mid femur ventrally unarmed, internal, and external genicular lobes with one elongate movable spur respectively; ventral side of mid tibiae with one external spur and one internal spur. Hind femur without spines ventrally; hind tibiae with 55-60 outer spines and 54-58 inner spines, arranged in groups. Supra-internal spurs of hind tibiae not exceeding ventral apex of hind tarsus (Fig. 1C ). Hind tarsus keeled ventrally and with one dorsal apical spine. Male genitalia with trapezoidal epiphallus, lateral sclerites and median process divided at apical fourth (Figs 2A, B , 3A, B ). Figure 1. Tachycines (Gymnaeta) trapezialis sp. nov. A male; head and pronotum, dorsal view B male; head and pronotum, lateral view C male; hind tarsus in dorsal view D female, subgenital plate in ventral view E ovipositor in lateral view. Figure 2. Tachycines (Gymnaeta) trapezialis sp. nov., male genitalia A dorsal view B ventral view. Female. Other characters are similar to male (Fig. 6 ). Subgenital plate wider than long and with three lobes; median lobe large and nearly trapezoid with apex transverse, paired lateral lobes small and nearly triangular with blunt apex (Fig. 1D ). Ovipositor (Fig. 1E ) shorter than half the length of hind femur. Figure 3. Illustration of male genitalia A dorsal view B ventral view. Coloration. Body brown. Frons with two dark longitudinal bands (Fig. 1A ). Pronotum and mesonotum margins dark brown. Apexes of abdominal tergites dark brown. Hind femur with darkish stripes laterally. Figure 4. Tachycines (Gymnaeta) trapezialis sp. nov. nymphs from Diaosiyan Cave A male B female. Measurements (mm). Body ♂16.2-17.6, ♀14.8-17.9; pronotum ♂6.3-6.6, ♀6.1-6.4; fore femur ♂10.8-11.3, ♀10.3-113; hind femur ♂16.3-17.6, ♀21.1-22.4; ovipositor 8.1-9.2. Figure 5. Holotype. Tachycines (Gymnaeta) trapezialis sp. nov. (male habitus) A lateral view B ventral view C dorsal view. Etymology. The name refers to trapezoidal epiphallus in males. Habitat. Individuals of the new species live in groups in subtropical karst caves (Figs 4 , 7 ). Distribution. Guizhou, China. Figure 6. Tachycines (Gymnaeta) trapezialis sp. nov. (female habitus) A lateral view B ventral view C dorsal view. Figure 7. The entrance of Diaosiyan Cave (photographed by Yi Du from Luga village, Ziyun County, Guizhou).