Revision of the Oriental species of the genus Sphegina Meigen, 1822 (Diptera: Syrphidae) Author Steenis, Jeroen Van C7F0D01C-B182-4B93-AF73-E4154367B535 Research Associate, Naturalis Biodiversity Center, Leiden; Hof der Toekomst 48, 3823 HX Amersfoort, the Netherlands. jvansteenis@syrphidaeintrees.com Author Hippa, Heikki 546524AD-3BD1-4830-842F-EEEE7DF4799B Zoological Museum, Biodiversity Unit, FI- 20014 University of Turku, Finland. heikki.hippa@gmail.com Author Mutin, Valeri A. 625E0F27-4538-417D-9155-6141947F04EA Amur State University of Humanities and Pedagogy, Komsomolsk-na-Amure, 681000, Russia. valerimutin@mail.ru text European Journal of Taxonomy 2018 2018-12-20 489 1 198 journal article 22082 10.5852/ejt.2018.489 79a76a5f-97b3-47cc-9bff-086a712cf3e2 3830537 B234C53F-BB56-4F3D-B400-F214E19DCF90 Sphegina (Asiosphegina) ghatsi sp. nov. urn:lsid:zoobank.org:act: 1BE2A8FF-B184-469B-B4E1-47C2746C6934 Figs 33E , 35F , 36 , 38F Differential diagnosis Sphegina (Asiosphegina) ghatsi sp. nov. is not particularly similar to any other known Sphegina . In the key it runs to couplet 31 together with Sphegina (Asiosphegina) prolixa sp. nov. Except for the characters mentioned in the key, the species can be separated by their strikingly different genitalia, particularly the superior lobes. In S. (A.) ghatsi sp. nov. the superior lobe is very simple and short subtriangular whereas in S. (A.) prolixa sp. nov. it is long, curved and posteriorly bilobed, with the ventral lobe exceedingly long. Etymology The specific epithet is derived from the type locality, the Ghats mountains. Material examined Holotype INDIA : ♂ ; “ India : Karna. St. / Mudigere ( 18 km W) / 7 Apr 1980 Mathis / & Friedberg coll”; USNM . Description Male LENGTH. Body 5.8 mm , wing 4.4 mm . HEAD. Face in lateral view concave, weakly projected antero-ventrally; frontal prominence very weakly developed. Ratio width of vertex at anterior ocellus: width of head 1: 6.0; ratio width of ocellar triangle: width of vertex 1: 1.5; ratio length of ocellar triangle: length of frons 1: 2.3. Face black, light grey pollinose, long pilose along eye-margin. Hypostomal bridge yellow, long pale pilose. Gena and mouth edge yellow with large subtriangular non-pollinose shiny area. Frons and vertex black, slightly pollinose, a squarish area posterior of lunula non-pollinose and shiny ( Fig. 38F ); pile short, light yellow. Frons with clear but narrow furrow medially. Occiput black, light grey pollinose, light yellow pilose. Eye with an area of enlarged facets at anterior margin. Antenna brown-yellow with black setae dorsally on scape and pedicel; basoflagellomere oval, ratio width: length 1: 1.3; arista short pilose, about 3 times as long as basoflagellomere. THORAX. Colour black, postpronotum, postalar callus and dorso-medial part of anepisternum and anepimeron yellow; greyish pollinose, posterior margin of katepisternum narrowly non-pollinose, shiny; scutum and pleuron with very short adpressed light yellow pile. Scutellum semi-lunular shaped, black, weakly pollinose, with pile slightly longer than on scutum, without observable setae at posterior margin, unclear if they are broken off. Fig. 36. Sphegina (Asiosphegina) ghatsi sp. nov. , holotype, ♂ . A . Sternum IV, ventral view. B . Left surstylus, lateral view. C . Left superior lobe, lateral view. D . Genitalia, right side, lateral view. Scale bars = 0.5 mm. WING. Entirely microtrichose; hyaline, stigma yellowish. Crossvein dm-cu meeting vein M slightly obliquely and vein M 1 meeting vein R 4+5 perpendicularly. LEGS. Pro- and mesoleg yellow, tarsomeres 4 and 5 black. Metaleg, Fig. 33E , with coxa black, trochanter yellow; femur black with basal ⅓ yellow, strongly incrassate, ratio width: length 1: 3.0; tibia black and yellow biannulate with long and wide apicoventral dens; tarsus entirely black, basitarsomere thick, ratio width: length 1: 3.2. ABDOMEN. Length ratio of terga I: II: III: IV 1: 3.2: 2.0: 1.8; ratio width at posterior margin: medial length of tergum II and III 1: 2.7 and 1: 0.7. Terga black, anterior 2/5 of tergum III with yellow fascia; pile pale, on terga short, laterally on terga I and II long; tergum I with a more or less horizontal row of 3–4 light yellow setae at lateral margin; sternum III without sclerotized part; sternum IV, Fig. 36A ; sterna VI, VII and VIII simple, with long yellow pile. Genitalia, Fig. 36 B–D: note the symmetrical surstyli and superior lobes. Female Unknown.