Review of the Eumerus tricolor species group (Diptera: Syrphidae) in Iran, with description of six new species Author Gilasian, Ebrahim A45912ED-BEEB-4733-AC6E-C22ACAFD6F63 Insect Taxonomy Research Department, Iranian Research Institute of Plant Protection (IRIPP), Agricultural Research, Education and Extension Organization (AREEO), Tehran, 19395 - 1454, Iran. ebrahimgilasian@gmail.com;gilasian@iripp.ir Author Steenis, Jeroen van C7F0D01C-B182-4B93-AF73-E4154367B535 Research Associate NBC-Naturalis, Leiden. % Hof der Toekomst 48, 3823 HX Amersfoort, The Netherlands. jvansteenis@syrphidaeintrees.com Author Parchami-Araghi, Mehrdad 2F788927-E377-471A-B658-9E86A41FC9CA Insect Taxonomy Research Department, Iranian Research Institute of Plant Protection (IRIPP), Agricultural Research, Education and Extension Organization (AREEO), Tehran, 19395 - 1454, Iran. maraghi20@yahoo.ca text European Journal of Taxonomy 2020 2020-11-02 722 106 152 journal article 10.5852/ejt.2020.722.1139 4239287 90B3B475-49D9-4869-8F5F-A788DB880356 Eumerus vallicolus Gilasian & van Steenis sp. nov. urn:lsid:zoobank.org:act: DB618219-7086-4DFA-82AC-F261D536B68D Figs 4H , 7H , 10D , 11I , 12F , 17 G–H, 19D, 21D, 23D Diagnosis This species differs from the species E. tricolor , E. pamirorum , E. sarybulunis and E. coeruleithorax by the following characters: eyes distinctly dichoptic, 5–6 ommatidia spaced, distance between eyes wider than in E. tricolor but narrower than in E. pamirorum and E. coeruleithorax , eyes in E. sarybulunis coalescent over some distance; frontal triangle with dense whitish pile like in E. sarybulunis (it is not covered with so dense pile in E. tricolor , frontal triangle in E. coeruleithorax with sparse black pile and in E. pamirorum with sparse white pile); ocellar triangle narrow like in E. tricolor (it is wider in other species); ocellar triangle black pilose like in the European E. tricolor (with white pile in Turkish E. tricolor and other species); thorax with relatively long pile like in E. coeruleithorax (with very short pile in E. tricolor and covered with longer pile in E. sarybulunis and E. pamirorum ); metafemur narrow like in E. tricolor (in other species it is either longer pilose and/or incrassate); abdominal maculae on terga III and IV more oblique than in other species. Etymology The name ‘vallicolus’ [Latin] is derived from ‘vallis’ (valley) and ‘incola’ (dweller), in reference to Chekab Valley, where the holotype was collected. Material examined Holotype IRAN • ♂ ; “ IRAN : Markazi prov. , Haftad / Qolleh Protected Area , / Chekab Valley , 2219 m , / 34°07′0.5″N , 050°16′25.3″E , / 28.v–15.vi.2016 , Malaise trap / near pool, E. Gilasian & M. / Parchami- Araghi // HOLOTYPUS ♂ / Eumerus vallicolus / Gilasian & van Steenis / 2020 [red label]”; HMIM . Description Male ( Figs 4H , 7H ) MEASUREMENTS. Body length: 6 mm ; wing length: 4.5 mm . HEAD ( Fig. 17 G–H). Eyes short yellowish pilose, dichoptic, 5–6 ommatidia spaced; face nearly parallelsided, shiny black and covered with short yellowish-white pile; frontal triangle black, weakly pollinose and covered with dense whitish pile; head in frontal view 4.3 times as wide as face; frontal triangle 1.6 times as long as vertical triangle; vertical triangle shiny black, with brownish pile; ocellar triangle isosceles; ocellar triangle shiny black, with blackish pile, 1.1 times as long as wide and 1.4 times as long as vertical triangle; distance between posterior ocelli to posterior margin of eye about 0.6 times as long as ocellar triangle; occiput light grey pollinose, with yellowish pile; frontal triangle 1.25 times as wide as ocellar triangle; vertex at posterior corner of eyes 1.2 times as wide as vertex over posterior ocelli; head in dorsal view 5.3 times as wide as vertex at posterior corner of eyes; antennae brownish-black; basoflagellomere almost 0.9 times as long as wide; arista about 2 times as long as basoflagellomere ( Fig. 11I ). THORAX. Scutum and scutellum shiny black, with relatively long white pile, without median pollinose vittae; posterolateral part of scutum with a longitudinal row of black seulae above base of wing; scutellum with marginal rim; pleurae shiny black; anepisternum, anepiemron and katepisternum with short whitish pile. LEGS ( Fig. 10D ). Predominantly black, short yellowish-brown pilose; apex of femora and basal narrow margin of tibiae orange; metafemur simple, narrow, about 4 times as long as wide; anteroventral and posteroventral margins of metafemur each with a row of 11 respectively 6 black setae in about apical half; metatarsus with tuft of dense orange pile ventrally. WING. Hyaline, entirely microtrichose; vein R 4+5 slightly sinuate; calypters yellowish; halter yellowishorange. ABDOMEN. Tergum I black with short blackish pile; tergum II mostly orange except for anterior black margin and median black vitta not reaching posterior margin of segment; tergum II yellowish pile except for short blackish pilosity on its posterior third; tergum III entirely orange, mostly short blackish pile except for whitish pile on its white maculae; tergum IV black, with mostly short whitish pile except for short black pile on its anterior and posterior margin; sterna short yellowish pilose; sternum I black in anterior half and orange in posterior half; sterna II and III orange; sternum IV black, rectangular, with rounded posterolateral corners and with median wide V-shaped incision posteriorly ( Fig. 12F ). GENITALIA ( Figs 19D , 21D , 23D ). Hypandrium simple; aedeagal apodeme relatively narrow in lateral view; posterior lobe of surstylus in lateral view sharply extending outward posteroventrally, with a longitudinal row of short and black setulae posteriorly, with a few short median setulae and with 2–3 setae anteriorly, posterior lobe of surstylus in dorsal view uniformly rounded apically, almost balloonshaped, covered with short setulae; inner accessory lobe of surstylus with short pile. Female Unknown. Distribution Iran .