Utivarachna arcuata sp. nov. (Figs. 1–4, 9) Type material. Holotype: male, China, Yunnan Province, Tengchong County, Jietou Township, Datang Village, Daheling Ganjiao, 25.42018°N, 98.40946°E, 1878 m, 19 May 2006, Xian-jin Peng, Xin-ping Wang and Peng Hu (Peng 060519 –1). Paratypes: 1 male, China, Yunnan Province, Tengchong County, Jietou Township, Datang Village, Daheling Ganjiao, 25.74556°N, 98.69630°E, 2030 m, 15 May 2006, Xian-jin Peng, Xin-ping Wang and Peng Hu (Peng 060515 –1); 4 males, China, Yunnan Province, Tengchong County, Xinhau Township, Longjing Village, Shanqing, 25.80672°N, 98.52928°E, 1880 m, 27 May 2006, Chang-min Yin, Jia-fang Hu, Shao-xian He & Yu-yan Wang (YHY13–1); 1 male, China, Yunnan Province, Longyang County, Mangkuan Township, Baihualing Village, Zaotang river, 25.30764°N, 98.79376°E, 2 June 2005, 1625 m, David Kavanaugh, Charles Griswold, Dazhi Dong & Heng-mei Yan (2005-041A–1); 1 female, China, Yunnan Province, Tengchong County, Jietou Township, Datang Village, Daheling Ganjiao camping site, 25.42767°N, 98.41288°E, 1952 m, 20 May 2006, Xinping Wang and Peng Hu (Wang 060520 –1); 1 female, China, Yunnan Province, Tengchong County, Jietou Township, Datang Village, Daheling Ganjiao, 25.42018°N, 98.40946°E, 1870 m, night, 17 May 2006, Xian-jin Peng, Xin-ping Wang and Peng Hu (Peng 060517 night–1). Etymology. The specific name comes from the Latin word “ arcuata ”, means curved and refers the shape of the basal portion of embolus. Diagnosis. The new species is similar to U. rama from Thailand (Chami-Kranon & Likhitrakarn, 2007: figs. 1–19) by the male palpal retrolateral tibia apophysis (Figs. 1 E, 2C) with the apex bearing a small hook, with membranous area, genital bulb longer than wide, subtegulum visible in prolateral view, and embolus transversal; female epigynum longer than wide, atrium large, posteriorly located, copulatory openings anteriorly located. The new species can be distinguished from U. rama by having: (1) posterior portion of genital bulb semi-spherical (Figs. 1 C, E, 2A, C); (2) basal portion of embolus transverse arch-shaped in new species (Figs. 1 D, 2B); (3) terminal portion of embolus only about one fifth long of basal portion (Figs. 1 D, 2B); (4) in retrolateral view, tibial apophysis gradually tapered (Figs. 1 E, 2C); (5) copulatory opening on the anterior margin of the epigynum (Figs. 3 B–C, 4A–B); (6) wider distance between the two connecting ducts (Figs. 3 C, 4B); (7) connecting ducts separated from each other much wider anteriorly (Figs. 3 C, 4B); (8) anterior bursae much longer and slender in new species (Figs. 3 C, 4B). Description. Male (holotype): Total length 4.80. Carapace: 2.20 long, 1.70 wide. Opisthosoma: 2.63 long, 1.85 wide. Eyes sizes and interdistances: AME 0.11, ALE 0.13, PME 0.15, PLE 0.13, AME–AME 0.08, AME– ALE 0.10, AME–PME 0.10, PME–PME 0.19, PME–PLE 0.21, ALE–PLE 0.15. Clypeus 0.10 high. Anterior eye row almost straight, posterior eye row slightly recurved, wider posteriorly. Chelicerae colored as carapace, with lateral condyle, 3 promarginal and 4 retromarginal teeth. Carapace reddish brown, with white hairs. Fovea dark, longitudinal, short bar-shaped. Sternum yellowish brown, with white hairs. Legs I–II light brown, III– IV yellow, without strong spines or ventral cusps, metatarsi III–IV with preening brushes on ventral. Labium longer than wide. Leg measurements: I 6.49 (2.00, 2.48, 1.28, 0.73), II 6.04 (1.90, 2.15, 1.30, 0.69), III 4.34 (1.33, 1.43, 1.10, 0.48), IV 5.69 (1.60, 1.86, 1.63, 0.60), formula: I, II, IV, III. Opisthosoma ovoid, with black hairs. Dorsum (Fig. 1 A) yellowish brown, with two pairs of muscular impressions, marginal area with scattered black spots, anal tubercle white. Venter colored as dorsum, with scattered irregular dark spots. Spinnerets yellowish brown, lightly colored, anterior spinnerets as long as posterior laterals. Male palp with retrolateral tibia apophysis (Figs. 1 E, 2C), the apex bearing a small hook. Genital bulb longer than wide (Figs. 1 D, 2B), posterior portion semi-spherical (Figs. 1 E, 2C). Subtegulum visible in prolateral view (Figs. 1 C, 2A). Sperm duct visible in retrolateral view (Figs. 1 E, 2C). Basal portion of embolus (Figs. 1 D, 2B) transverse arch-shaped, terminal portion of embolus only about one fifth long of basal portion. Female (Paratype Wang 060520 –1): Total length 6.65. Carapace: 2.85 long, 2.15 wide. Opisthosoma: 3.90 long, 2.95 wide. Eyes sizes and interdistances: AME 0.15, ALE 0.16, PME 0.15, PLE 0.16, AME–AME 0.09, AME–ALE 0.10, AME–PME 0.10, PME–PME 0.23, PME–PLE 0.26, ALE–PLE 0.13. Clypeus 0.08 high. Carapace dark brown, with white hairs, without pattern. Anterior eye row almost straight, posterior eye row slightly recurved, wider posteriorly. Fovea dark, longitudinal, short bar-shaped. Sternum reddish brown, lightly colored, with white hairs. Chelicerae colored as carapace, with lateral condyle, 3 promarginal and 4 retromarginal teeth. Labium longer than wide. Legs reddish brown, without strong spines or ventral cusps. Metatarsi III–IV with preening brushes on ventral. Leg measurements: I 7.20 (2.15, 2.65, 1.50, 0.90), II 6.80 (2.05, 2.45, 1.45, 0.85), III 5.40 (1.55, 1.85, 1.35, 0.65), IV 6.35 (1.35, 2.35, 1.90, 0.75), formula: I, II, IV, III. Opisthosoma ovoid, with black hairs, with scattered lightly colored spots. Dorsum (Fig. 3 A) blackish gray, with two pairs of muscular impression, with 7 transverse arch-shaped lightly colored patterns from median portion to the end, anal tubercle white. Venter colored as dorsum, with a U-shaped dark pattern in the middle. Spinnerets yellowish brown, posterior laterals longest. Epigynum longer than wide (Figs. 3 B, 4A), atrium large, posteriorly located; copulatory opening on the anterior margin of epigynum. Vulva (Figs. 3 C, 4B): copulatory duct long and coiled; connecting duct posteriorly narrower, and anteriorly wider than copulatory openning, connecting anterior bursae and spermathecae; spermathecae posteriorly located, spherical; anterior bursae stip-shaped, posterior end close to spermathecae. Variation. Males, total length 3.65–5.10. Females, total length 5.85–6.65. Distribution. China (Yunnan Province).

Published as part of Zhao, Yi & Peng, Xian-Jin, 2014, Spiders of the genus Utivarachna from China (Araneae: Corinnidae), pp. 578-588 in Zootaxa 3774 (6) on pages 579-581, DOI: 10.11646/zootaxa.3774.6.6, http://zenodo.org/record/228939