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A new long-legged fly species Poecilobothrus lorestanicus sp. n. from Iran is described and illustrated. The new species appears to be quite distinct in having male mid tarsus with 2nd and 3rd segments elongated and laterally flattened, covered with dorsal and ventral rows of dense setae; and 4–5th segments with elongated setulae dorsally. Резюме. Описан новый вид Poecilobothrus lorestanicus sp. n. из Ирана, отличающийся от всех видов рода удлиненными и уплощенными 2 и 3 члениками средней лапки самца, дорсально и вентрально несущими длинные щетинки, а также удлиненными щетинками на 4 и 5 члениках той же лапки. Приведены фотографии ключевых признаков самца и самки. The genus Poecilobothrus Mik, 1878 belongs to the subfamily Dolichopodinae, tribe Dolichopodini and numbers 14 Palaearctic species and subspecies [Grichanov, 2014]. Morphologically it is close to Hercostomus Loew, 1857, differing by the following combination of characters. Body medium to large size, hind femur with anterior seta positioned at apex, thorax with distinct dark spot above notopleuron, epandrial lobe well developed [Grichanov et al., 2011]. Species of the Poecilobothrus occur in the West Palaearctic countries with relatively mild climate, from southern Scandinavia in the North, to North Africa and Central Asia in the South. The Iranian fauna included 7 Poecilobothrus species. The most comprehensive key to known species of the genus was published by Khaghaninia et al. [2013]. Treating a new material collected during 2016 season from 64 sites in the Markazi and Lorestan provinces, we have found males and females of a new peculiar Poecilobothrus species described below. Material and methods The holotype and paratypes of the new species have been sampled by standard sweep net and are housed at the Zoological Institute of the Russian Academy of Sciences, St. Petersburg (ZIN). The specimens were studied and illustrated with ZEISS Discovery V-12 stereomicroscope and AxioCam MRc5 camera. Morphological terminology follows Cumming and Wood [2009]. The relative lengths of the podomeres are given in millimeters. Body length is measured from the base of the antenna to the tip of abdominal segment 7. Wing length is measured from the base to the wing apex. Figure showing the male genitalia in lateral view is oriented as they appear on the intact specimen (rotated 180° and lateroflexed to the right), with the morphologically ventral surface of the genitalia facing up, dorsal surface down, anterior end facing right and posterior end facing left. Poecilobothrus lorestanicus Grichanov et Ahmadi, sp. n. (Figs 1–8) Material. Holotype, ♂: Iran, Lorestan Prov., Shirvan, 32°59.93′N, 49°35.28′E, 1456 m, on mud at river bank, 20.06.2016, Ahmadi/250 (ZIN, dried and mounted on pin). Paratypes (ZIN, in ethanol): 4♂, 1♀, same label; 1♂, Iran, Lorestan Prov., Khorram Abad, 33°46.91′N, 48°46.87′E, 1137 m, 20.06.2016, Ahmadi/251. Description. Male (Fig. 1). Head (Fig. 2): frons metallic bluish green, sparsely pubescent; face yellow pollinose, clypeus white pollinose. One long and strong vertical on small mound at upper corner of frons, one short postvertical, pair of long and strong and pair of hairlike ocellar setae present; five upper postocular setae black; lateral and lower postocular setae white. Eyes with short hairs. Face parallel-sided and slightly narrowed to middle; face under antennae as wide as height of postpedicel; clypeus flat, not reaching lower margin of eyes. Antenna (Fig. 3) slightly shorter (7/8) than height of head; scape and pedicel mostly yellow, blackish dorsally; postpedicel entirely black, internally convex anteriad, with short distal setulae; postpedicel asymmetric, subtriangular, with rounded apex, slightly longer than high, microscopically haired; stylus positioned at middle of dorsal side, black, pubescent, with hairs as long as basal diameter of stylus. Length ratio of scape to pedicel to postpedicel to stylomere 1 to stylomere 2, 14 : 11 : 21 : 16 : 56. Palpus and proboscis small; proboscis brown, with short hairs; palpus reddish yellow, with black hairs and 1 short black seta. Thorax mostly dark bluish green, with strong black major Figs 1–8. Poecilobothrus lorestanicus Grichanov et Ahmadi, sp. n. 1 – male habitus; 2 – male head; 3 – male antenna; 4 – male mid tarsus; 5 – male wing; 6 –hypopygium, lateral view; 7 – female habitus; 8 – female wing. Рис. 1–8. Poecilobothrus lorestanicus Grichanov et Ahmadi, sp. n. 1 – внешний вид самца; 2 – голова самца; 3 – усик самца; 4 – средняя лапка самца; 5 – крыло самца; 6 – гипопигий сбоку; 7 – внешний вид самки; 8 – крыло самки. bristles; mesonotum with metallic reflection and distinct dark metallic spot above notopleuron; pleura grey pollinose; 6 strong dorsocentral setae; 2 rows of acrostichals; 2 strong notopleural, 1 strong and 2 fine humeral, 1 posthumeral, 1 presutural, 1 sutural, 2 supraalar, 1 postalar setae present. Proepisternum with 1 strong black seta above fore coxa and several short light hairs. Scutellum with 2 strong and 2 small setae and some dorsal and marginal short

A new peculiar species of Poecilobothrus Mik, 1878 (Diptera: Dolichopodidae) from Iran