Liriomyza pirinensis sp. nov. (Figs 12–21) Type material. HOLOTYPE: ♂. BULGARIA: Blagoevgrad Province, Pirin Mts., Vikhren hut, 41º45‘22“N, 23º24‘55“E, 2000m a.s.l., 27.vi.2016, alpine meadow, M. Barták & Š. Kubík leg. (CULSP). PARATYPE: 1 ♂, same data as holotype (CMCH). Etymology. The name of the species, an adjectival toponym, is derived from the name of Pirin Mountains. Description. Male. Head (Figs 12–13) yellow, ocellar triangle shiny black. Hind margin of eye black, both vt on dark area, upper orbits brownish black and lower orbits brownish. Face and antennal pits yellow. First flagellomere with only short pubescence, blackish brown, scape and pedicel yellow, palpus yellow. Frons about 1.4 times the width of eye at level of anterior ocellus, orbits slightly projecting above eye at base of antennae. Ocellar triangle small, its anterior margin not reaching level of single ors. One reclinate ors present, 3 inclinate ori, lower one shorter. Orbital setulae short and sporadic. Gena deepest in posterior part, almost 0.3 times the height of eye. Cheek forming a distinct narrow ring below eye, 1 vi and 4 pm setae present. First flagellomere small, rounded, covered with short pubescence, scape with 2 setulae.Arista only 0.75 times as long as eye hight, with short pubescence, basally spindlelike swollen. Lunule higher than semicircle. Thorax. Scutum entirely shiny black, scutellum blackish laterally, bc setae on black area. Notopleural area yellow, postpronotal lobe yellow with a small blackish oval spot in front, 1 ppnt seta and 5 setulae on black area. Anepisternum blackish along front and lower margins, upper third and hind margin yellow, anepst setae and 3 setulae on yellow area. Katepisternum almost entirely black, narrowly yellow along upper margin, kepst seta on yellow area. Black colour of katepisternum and meron not divided by a yellow area. Scutum with 1+3 dc, presutural dc only 0.6 length of postsutural setae, distance between 1 st dc and 2 nd dc is about 1.7–2.1 times longer than between 2 nd and 3 rd dc setae. Acrostichal setulae regularly in 4 rows. All usual setae present: 1 oc, 1 pvt, 1 vte, 1 vti, 1 ppl, 1 ppnt, 1+1 npl, 1 prs, 1 sa, 1 epa, 1 ipa, 1 anepst, 1 kepst, 1 bs, 1 as. Wing (Fig. 14) veins brown, base of wing yellow. Squamae greyish, margin and fringe blackish. Knob and stem of halteres yellow. Wing length 1.65–1.75 mm, costa reaching M 1+2, ratio of costal sections 2–4 = 3.31: 1.56: 1.00. The ultimate section of vein M 3+4 almost 2 times the length of penultimate. Coxae and femora yellow with base brownish, femora with narrow brownish striations, tibiae and tarsi all brown. Abdomen blackish brown. Male genitalia: epandrium (Fig. 17) rather high, ventro-apical edge strongly narrowed with the usual thick peg, covered with sparse long setae; cerci moderately long and very narrow, about as long as 0.6 height of epandrium; subepandrial sclerite (Fig. 18) slightly higher than broad, with dorsal arms narrow, broadly divergent, ventral arms very long with long seta; surstylus (Fig. 21) with single subapical spine; phallus as Figs 15–16, distiphallus complex symmetrical, with characteristic structures; swollen apical section ejaculatory duct approximately two thirds length basiphallus; hypandrium Ushaped, long and narrows arms thin with a subbasal lateral process; ejaculatory apodeme (Figs 19–20) Y-shaped, with a broad but not long bulb and with an asymmetrical, broadly rounded blade. Female and biology unknown. Comments. This new species is very similar to European Liriomyza thesii Hering, 1924 considering external characters and the form of male genitalia. However, L. pirinensis sp. nov. distinctly differs in the darker coloration of head between the ocellar area and the upper orbits, the orbits are distinctly darker, and the first flagellomere is entirely black with only short pubescence. The cheeks form only very narrow ring. The scutum is without small yellow patches at the hind corners. The black colour of katepisternum and meron are not divided by a yellow area. The genitalia are similar, but those of the new species differ in the shape of the distiphallus, paraphalli, swollen apical section ejaculatory duct, hypophallus and surstylus. The cerci are only sparsely covered with setae on the ventral third (see Papp & Černý 2017: Figs 79A–K). The North American Liriomyza pilicornis Lonsdale, 2017 is also clearly related, but distiphallus is with short basal stem and one pair of short, internal fringed processes and one pair of ventromedial bars. Mesophallus short, dark and especially widened subbasally, paraphalli long, flat leaf-like plates. Swollen apical section ejaculatory duct approximately about half length basiphallus. First flagellomere relatively large, circular and distal half covered with hairs approximately as wide as arista base, orbits only narowlly brownish along lateral margin, 2 ors, 2 ori, fore tibia brownish and mid tibia brown both with base yellowish (see Lonsdale 2017: Figs 4, 15, 153–157).

Published as part of Černý, Miloš, Barták, Miroslav, Kubík, Štěpán & Vála, Miloslav, 2022, New records of Agromyzidae (Diptera) from Bulgaria, pp. 401-438 in Zootaxa 5175 (4) on pages 420-423, DOI: 10.11646/zootaxa.5175.4.1, http://zenodo.org/record/7006411