Sciapus negrobovi Naglis & Barták, 2015, sp. nov.

Sciapus negrobovi sp. nov.

(Fig. 3)

Type material. HOLOTYPE ♂: PORTUGAL, Valhelhas, 500 m, near river, SW+PT, 16–17.VII.2009, M. Barták (CULSP). PARATYPE: PORTUGAL, 1 ♀ same data as holotype, M. Barták (CULSP).

Diagnosis. Scape and pedicel yellow, first flagellomere dark brown; frons with dense yellowish-grey pruinosity, face with dense silvery-white pruinosity; mesonotum with dense yellowish-grey pruinosity; abdomen metallic green, tergites 2–5 with large yellow dorsolateral patch; legs yellow, tarsomeres simple; lower calypter with white setae; halter pale yellow; hypopygium mainly yellow; “Organ X” with long, S-shaped ventral setae.

Description. Male. Body length (holotype): 3.5 mm, wing length 3.4 mm. Head: frons with dense yellowishgrey pruinosity, face with dense silvery-white pruinosity, below antennae about as wide as diameter of eyes; clypeus bulging; pair of strong vertical and ocellar setae; lower postoculars white; palpus pale yellow, with white apical setae; proboscis yellow. Antenna: scape and pedicel yellow, first flagellomere dark brown, as long as high; arista apicodorsal, bare. Thorax: mesonotum metallic green, with dense yellowish-grey pruinosity; ac strong, comprising 7–8 pairs; 5 pairs of strong dc, with additional small pair in front; 2 strong scutellar setae and small, hair-like lateral seta; pleura with dense greyish-white pruinosity; 2 small pale ppls. Legs: including coxae yellow, except hind tarsomeres slightly infuscated. Fore leg: coxa with white hairs and row of strong yellow lateral and some apical setae; femur with 4–5 white ventral setae, half as long as diameter of femur; tibia and tarsomeres bare; relative podomere ratios: 42:54:37:16:12:8:5. Mid leg: coxa with several strong yellow apical setae; femur bare; tibia with 1 strong black ad seta at 1/5; tarsomeres bare; relative podomere ratios: 48:75:50:21:16:9:6. Hind leg: coxa with 2 strong white lateral setae; femur with 1 small black anterior preapical seta; tibia with row of small black pd setae, and some small black apical setae; basitarsus with small black pv seta basally; relative podomere ratios: 65:92:33:31:17:10:5. All claws and pulvilli present but small. Wing: hyaline, veins yellow; R1 and R2+3 straight; R4+5 strongly curved posteriad at distal 4/5; M1 with almost right-angle bend at 1/3, then running straight and joining wing margin anteriad of apex close to R4+5; M2 straight, not reaching wing margin, as long as dm-cu; section of M between dm-cu and M2 as long as dm-cu; CuAx ratio: 1.1; RMx ratio: 8.0; lower calypter white, with white setae; halter pale yellow. Abdomen: dark metallic green, tergites 2–5 with brown basal band and with large yellow dorsolateral patch, tergites 7 and 8 entirely yellow; all hairs and setae black. Hypopygium (Fig. 3): epandrium, cercus, and “Organ X” pale yellow, base of hypandrium and apical part of surstylus dark brown. Epandrial lobe with 1 long apical and 1 small basoventral setae; surstylus with 2 strong apical and 1 curved subapical setae; “Organ X” with midventral lobe bearing long, S-shaped setae. Female: similar to male but: fore coxa with yellow spine-like apical setae; fore femur with ventral row of 4–5 strong, yellow spine-like setae, longer than diameter of femur; fore tibia with some small ad and pd setae; mid femur with 1 anterior preapical seta; mid tibia with 1 strong ad, 3 pd, and 1 av setae; hind tibia with 1 strong ad seta; tergite 1 yellow, tergites 2–4 metallic green with yellow lateral patch.

Etymology. The new species is dedicated to the Russian dipterist, Oleg Pavlovich Negrobov.

Remarks. The new species belongs to the aberrans species–group: tarsomeres simple; frons and thorax with dense pruinosity; cerci fused; “Organ X” fused, with long ventral setae; abdominal segments partly yellow. In the Palaearctic key (Grichanov & Negrobov 2014) S. negrobovi runs to S. aberrans Becker, 1918 and S. subvicinus Grichanov, 2007. The three species can be separated by the characters given in the key below.

1 “Organ X” with midventral lobe bearing long, S-shaped setae (Fig. 3 A); epandrial lobe with 1 strong apical and 1 small bas-

oventral seta......................................................................... S. negrobovi sp. nov. - “Organ X” without midventral lobe, setae not S-shaped....................................................... 2 2 Cercus small and rounded; epandrial lobe with 2 apical setae (Grichanov & Negrobov 2014, fig. 1)..... S. aberrans Becker - Cercus twice as long as wide; epandrial lobe with 1 apical and 1 midventral seta (Bulli & Negrobov 1987, figs 1–3, as S. medi-

terraneus Bulli & Negrobov)........................................................ S. subvicinus Grichanov