Ptosoproctus gen. nov., a new genus with two new species of Shield-back Katydid with the first record of genus Eulithoxenus Bey-Bienko, 1951 from China (Orthoptera: Tettigoniidae: Tettigoniinae: Drymadusini) Author Shen, Zi-Hao Hubei Broad Nature Technology Service Co., Ltd. Wuhan 430079 China. Author Yin, Zi-Xu Co-first author. College of Fisheries, Ocean University of China, Qingdao 266003, China. Author Lee, Michael Dulwich College Beijing, 89 Capital Airport Road, Beijing 101300, China. Author Liu, Yi-Jiao 0000-0002-2169-5628 School of Life Sciences, East China Normal University, Shanghai 200241, China. https: // orcid. org / 0000 - 0002 - 2169 - 5628 Museum of Biology, School of Life Sciences, East China Normal University, Shanghai 200241, China. Author He, Zhu-Qing Author Wang, Zi-Fan School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China. Author Wang, Tong-Xin School of Life Sciences, Lanzhou University, Lanzhou 730000, China. text Zootaxa 2021 2021-11-12 5067 4 548 568 journal article 3547 10.11646/zootaxa.5067.4.4 2efa715e-0e76-4e6e-8a3c-be1afb40e0ac 1175-5326 5683472 F1A285CC-00E0-4FDB-8612-A5CC59475C98 Ptosoproctus lanzhouensis Shen, Yin & He sp. nov. 兰州折尾ỡ Figs. 1–5 , 9 , 14–15 Description. General. Body small. Head frons flat, slightly oblique ( Fig. 2 AB). Fastigium of vertex distinctly wider than scape of antenna ( Fig. 2B ). Eyes broadly round and projecting outward. Disc of pronotum both sides with a broadly obtuse concavity on middle part, anterior and posterior margin of pronotum slightly concaved, median carina and posterior transvers sulcus obscure, central transvers sulcus distinctly Chinese characters “八”-shaped, lateral carina faintly indicated; lateral lobes longer than high, with weakly humeral sinus ( Fig. 2 BCEF). Prosternum unarmed ( Fig. 2D ). Mesosternum with a pair of obtuse triangular lobe-shaped processes, wider than long ( Fig. 2D ). Metasternum with a pair of arched lobe-shaped processes, wider than long ( Fig. 2D ). Dorsal surface of fore coxae with 1 long spine; length of fore femora nearly equal to pronotum, dorsally unarmed, ventrally with 0–2 internal spinules and externally unarmed, genicular lobes with 1–2 internal spinules and externally unarmed; fore tibiae both sides with a crack-shape tympana, dorsally with 3–4 externally spines and internally unarmed, ventrally with 6 pair of spines, a pair at the apical. Middle femora dorsally unarmed, ventrally with 0–1 internal spinules and externally unarmed, genicular lobes with 1–2 external spinules and 1 internal spinule; middle tibiae dorsally with 4–5 internal spines and 2–4 external spines, ventrally with 6 pair of spines, a pair at the apical. Hind femora dorsally unarmed, ventrally with 0–1 external spinules and 2–3 internal spinules, genicular lobes with 0–1 spinules on both sides; hind tibiae dorsally with 23–34 spines on both sides and 1 pair of apical spurs, ventrally with 8–12 spines on both sides and 2 pair of apical spurs. FIGURE 3. Wings of male Ptosoproctus lanzhouensis sp. nov. A. tegmina; B. left tegmen in dorsal view; C, right tegmen in dorsal view; D. hind wings; E. left tegmen in ventral view; F. right tegmen in ventral view. Scales: 1 mm. Male. Tegmina brachypterous, slightly shorter than pronotum, slight beyond or extending to 3 th abdominal tergite posterior margin. Left tegmina ventrally with stridulatory file about 30 teeth ( Fig. 3E ). Right tegmina ventrally with vestigial stridulatory file about 19 teeth ( Fig. 3F ). Mirror on right tegmina pentagonal, distinctly longer than wide ( Fig. 3 CF). Hind wings rudimentary ( Fig. 3D ). 10 th abdominal tergite fused with epiproct, posterior margin of 10th abdominal tergite with a broadly triangle notch at the joint, form a strongly down-folded membranous projection on tergite posterior margin, apex broadly rounded, almost sightless from above, projection with a median longitudinal furrow which basal narrow and apical widish. Cercus pileous, short and stout, external margin almost straight; apex short and obtusely conical; inner tooth near cercus apex, robust, recurved, wide at base, gradually narrow towards the apical part, apex acute, raise first and then decurved. Subgenital plate about 1.25 times longer than width, with lateral carinae, middle part of posterior margin with a weak triangular excision, styli short ( Fig. 4C ). Titillators with broad basal arms, apical inflated connect with short apical arms; apical arms dorsally bearing one rows denticles, with acute apex ( Fig. 4E ). Female. Tegmina slightly shorter than quarter pronotum, extending to 1 th abdominal tergite anterior margin, clearly visible and discontiguous in dorsal view ( Fig. 2 EF). Cercus conical and hirsute ( Fig. 4F ). 10 th abdominal tergite not fused with epiproct, posterior margin of 10 th abdominal tergite with a shallow broadly round notch on middle part ( Fig. 4F ). Subgenital plate wider than length, with lateral carinae, middle of posterior margin with a deep angle concave ( Fig. 4G ). Ovipositor shorter than hind femora, distinctly upcurved ( Fig. 4H ). Coloration. Body laterally and dorsally generally whitish gray, with dark brown or black marmoration, ventrally yellowish (greenish in life). Lower and hind margin of pronotum lateral lobes whitish gray with dark brown spots. Tegmina orange, costal area whitish gray with dark brown spots, radius area with dark brown spots. Spines of each leg black. Apex of male cercus inner tooth black. Ovipositor apical part black. FIGURE 4. Abdominal apex of Ptosoproctus lanzhouensis sp. nov. A–E. male; F–H. female. A, F. dorsal view; B. lateral view; C, G. ventral view; D. rear view; E. titillators; H. ovipositor. Scales: 1 mm. FIGURE 5. Body of Ptosoproctus lanzhouensis sp. nov. A, B. male; C, D. female. A, C. dorsal view; B, D. lateral view. Scales: 1 cm. Measurements(mm). Body (from head to tip of abdomen): ♂ 16.67–19.30, ♀ 17.12; pronotum: ♂ 4.46–4.60, ♀ 5.40; tegmina: ♂ 3.74–4.42, ♀ 1.30; mirror of right tegmina (from fore to hind): ♂ 1.90; fore femora: ♂ 4.46–4.80, ♀ 5.15; middle femora: ♂ 4.90–5.54, ♀ 6.10; hind femora: ♂ 17.42–19.20, ♀ 20.65; fore tibiae: ♂ 5.40–5.90, ♀ 6.62; middle tibiae: ♂ 6.0–6.77, ♀ 7.40; hind tibiae: ♂ 17.42–18.42, ♀ 19.70; male titillators (straight-line distance from base to end): 1.50; ovipositor: 10.90. Material examined. Holotype : ♂ , Lanzhou University Yuzhong Campu , Xiaguanying town , Yuzhong country, Lanzhou city, Gansu Province , China ( 104°8'8.00"E , 35°56'40.10"N , alt. 1800m ), 30-vi-2020 , leg. Zifan Wang. Paratypes : 2♂ , same data as in holotype ; 2♂ 1♀ , Lanzhou University Yuzhong Campu , Xiaguanying town , Yuzhong country, Lanzhou city, Gansu Province , China ( 104° 8'50.97"E , 35°57'2.75"N , alt. 1850m ), 2-vii-2019 , leg. Tongxin Wang. Remarks. See Ptosoproctus baishishanicus sp. nov. Songs. The adults make calling songs at night. The song consists of echemes with syllables. Echeme sequence duration for 23–34 s with 7–9 s interval. In each echeme sequence, there are about 40–50 echemes with rate as 1.76 echeme/s. Each echeme consist 1–2 syllables irregularly, echeme duration for 50–150 ms, echeme interval for 350–780 ms. Each syllable duration for 50–55 ms, syllables interval for 35–45 ms. Etymology. The specific epithet is named after Lanzhou, the type locality. Distribution: China ( Gansu ). Known only from the type locality.