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Faunistic, distributional, and taxonomic data on the genus Opilio Herbst, 1798 from the Caucasus are presented. Four new species (Opilio silvestris sp. n., Opilio arborphilus sp. n., Opilio nabozhenkoi sp. n., Opilio caucasicus sp. n.) are described. Six species (Opilio lederi Roewer, 1911, Opilio hemseni Roewer, 1952, Opilio parietinus De Geer, 1778, Opilio apsheronicus Snegovaya, 2005, Opilio shirvanicus Snegovaya, 2004, Opilio saxatilis C.L. Koch, 1839) are figured and partly redescribed. Резюме. Приводятся фаунистические и таксономические данные по роду Opilio Herbst, 1798 с территории Кавказа. Даются описания 4 новых видов сенокосцев (Opilio silvestris sp. n., Opilio arborphilus sp. n., Opilio nabozhenkoi sp. n., Opilio caucasicus sp. n.). Для 6 видов (Opilio lederi Roewer, 1911, Opilio hemseni Roewer, 1952, Opilio parietinus De Geer, 1778, Opilio apsheronicus Snegovaya, 2005, Opilio shirvanicus Snegovaya, 2004, Opilio saxatilis C.L. Koch, 1839) приводятся диагностические рисунки и частично переописания. The species of the genus Opilio Herbst, 1798 from the Caucasus are recorded and described by Roewer [1911, 1912, 1923, 1952, 1956], Redikorzev [1936], Staręga [1966, 1978, 2003], Bogachev [1951], Morin [1937], Snegovaya [1999, 2004a, b, 2005, 2006]. 15 species of the genus are known now from the Caucasus: O. apsheronicus Snegovaya, 2005, O. arborphilus sp. n., O. caucasicus sp. n., O. consputus (Simon, 1895), O. coxipunctus (Sørensen, 1912), O. ejuncidus (Thorell, 1876), O. hemseni Roewer, 1952 (= O. reginae Staręga, 1966), O. lederi Roewer, 1911(= Phalangium coronatum Redikorzev, 1936 = O. redikorzevi Roewer, 1956), O. nabozhenkoi sp. n., O. pallens Kulczyсski, 1901, O. parietinus (De Geer, 1778), O. saxatilis C.L. Koch, 1839, O. shirvanicus Snegovaya, 2004, O. silvestris sp. n., O. lepidus (L. Koch, 1878). As a result of study of new material four new harvestman species are described from the Caucasian territory. Abbreviations used: IZB (+ catalogue number) – Zoological Institute NAS of Azerbaijan, Baku; ZIN – Zoological Institute of Russian Academy of Sciences, Saint-Petersburg, Russia; ZMMU – Zoological Museum of Moscow State University, Moscow, Russia; RCNS – Reference collection of Nataly Snegovaya, Baku, Azerbaijan; BLI – index of legs length (proportion of femur I length to width of carapace [Staręga, 1972]). Opilio lederi Roewer, 1911 (Fig. 1–9) Opilio lederi Roewer, 1911: 130. Opilio lederi: Roewer, 1923: 773, fig. 946. Opilio lederi: Staręga, 1978: 30. Opilio lederi: Chevrizov, 1979: 23, fig. 152. Opilio redikorzevi: Snegovaya, 1999: 455, fig. 19–23 (misidentified). Opilio lederi: Snegovaya, 2004a: 313. Male (measurement: 1 (IZB N5). Body length 6.2 mm, width 3.5 mm. Body solid, light-brown. Transverse rows of denticles single or double. Eye tubercle wide, with 4–5 small denticles, distant on two diameters from frontal margin. Large black-tipped denticles grouped into crown are situated in front of eye tubercle. Legs short, first pair thickened (BLI 0.857). Femora I spindleshaped, thickened, strong. All femora with large denticles, other parts with smaller denticles, appearing as granules. Length of legs (mm): I – 3+1.3+2.5+2.5+5=14.3, II – 4+1.3+4.1+3.2+10.2=22.8, III – 3.3+1.4+2.7+3+5=15.4, IV – 4.4+1.4+7.5+4.4+7=20.7. Pedipalps strong. Femora ventrally with large spine-tipped denticles, dorsally with large denticles; patella dorsally with large denticles; tibia ventrally with small denticles, dorsally with denticles; tarsus ventrally with microgranules. Length of palpal segments: femur 1.65 mm, patella 0.8 mm, tibia 1 mm, tarsus 1.7 mm; total length 5.5 mm. Chelicera large and strong. Basal segment dorsally with some denticles, distal segment dorsally with some big granules. Pedipalps and chelicera light-brown with dark-brown spots. Length of basal segment of chelicera 2.25 mm, distal segment – 2.7 mm. Penis slightly narrowed to base, with small “wings”. Length of penis 3.35 mm, stylus 0.38 mm, glans 0.13 mm. Female differs from male by larger size of body and more rounded body form. Material. Russia: Daghestan: 4 , 3 (IZB N5), Kurush Biostation of Dagestan Pedagogical Institute, 2400 m, under stones, 3.07.1991, leg. S. Dashdamirov; 1 , 1 , 3 juv. (IZB N13), the same place, 2500–2700 m, under stones, 6.07.1991, leg. S. Dashdamirov; 4 , 5 , 1 juv. (RCNS), Akhty Distr., Kurush village, 06–07.1991, leg. G. Abdurakhmanov; 8 , 4 , 2 juv. (RCNS), Charoda Distr., Archib village, 06–07.1991, leg. G. Abdurakhmanov; 1 (RCNS), Khiv Distr., Kandik, Chuvek, Tsundik village, 07.2004, leg. G. Abdurakhmanov; 1 (RCNS), Buynaksk Distr., Verhniy Karanay settlement, Кавказский энтомол. бюллетень 6(1): 3−18 © CAUCASIAN ENTOMOLOGICAL BULL. 2010

Further studies on harvestmen of the genus Opilio Herbst, 1798 (Arachnida: Opiliones: Phalangiidae) from the Caucasus