Mythicomyia Coquillett 1893

Key to the South American species of Mythicomyia (Modified from Ramos-Pastrana et al. (2024)) MALES 1 Knob of halter black, usually white below and at apex........................................................ 2 - Halter knob white or yellowish above and below............................................................ 8 2 Proboscis short, less than height of eye.................................................................... 3 - Proboscis longer, either equal to or greater than height of eye.................................................. 7 3 Postpronotal lobe entirely black, posterior margin in some specimens brownish............... M. collina (Philippi, 1866) - Postpronotal lobe white or yellow........................................................................ 4 4 Scutellum with proximal half dark brown and distal half whitish; legs predominantly whitish, with light brown to brown spots in some of its structures............................... M. bilobata Ramos-Pastrana, Rojas-Portilla & Evenhuis, 2024 - Scutellum entirely dark brown to black; legs predominantly dark brown to black................................... 5 5 First flagellomere ovoid, not much longer than wide; m -m cross vein shorter than r -m cross vein; pseudo-surstylus elongate and narrow, rod-like in lateral view................................................ M. hyalinipennis (Brèthes, 1919) - First flagellomere rod-like, much longer than wide; m -m cross vein longer than r -m cross vein; pseudo-surstylus relatively broad in lateral view, with apex somewhat pointed........................................................... 6 6 Distal third of coxae and femora yellowish; extreme base of dm cell anterior to R 2+3 bifurcation; anterior arms of parameral sheath somewhat clavate................................................................... M. huk sp. nov. - Coxae and femora almost entirely brown; extreme base dm cell at level of R 2+3 bifurcation; anterior arms of parameral sheath characteristically spatulate with straight border.......................................... M. iskay sp. nov. (in part) 7 Proboscis not longer than height of eye, usually less........................................ M. brachytis Hall, 1976 - Proboscis long, projecting at least twice eye height beyond oral margin........................... M. problis Hall, 1976 8 Middle tibia straight................................................................................... 9 - Middle tibia deformed (Fig. 38) or somewhat arcuate basally (Fig. 76), best seen in lateral view...................... 14 9 Length of proboscis from oral margin equal to or greater than height of eye...................................... 12 - Length of proboscis from oral margin less than height of eye.................................................. 10 10 Scutellum whitish yellow........................................................ M. pusillima Edwards, 1930 - Scutellum dull black................................................................................. 11 11 Epandrium somewhat rectangular-shaped and wide in lateral view; anterior arms of parameral sheath narrow with acute apex (Hall 1976: fig. 22 right)................................................................ M. orthis Hall, 1976 - Epandrium somewhat triangular-shaped; anterior arms of parameral sheath characteristically spatulate with straight border (Figs 26–27)..................................................................... M. iskay sp. nov. (in part) 12 Scape subequal to pedicel; face black, except along oral margin, narrowly yellow; diadem present..... M. macra Hall, 1976 - Scape much shorter than pedicel; face yellowish on the upper half, black bellow; diadem absent...................... 13 13. m-m crossvein absent, if present much shorter than r-m crossvein (i.e. dm cell usually five sided); first abdominal segment narrowly yellow medially; ejaculatory apodeme squarish paddle-like (Hall 1976: fig. 21 right) ........ M. citrina Hall, 1976 - m-m crossvein present, as long as r-m crossvein (i.e. dm cell six sided, rarely five sided); first abdominal segment all black; ejaculatory apodeme broad, somewhat rounded (Figs 61– 62)...................................... M. tawa sp. nov. 14 Length of proboscis from oral margin less than height of eye.................................................. 15 - Proboscis long, projecting at least twice eye height beyond oral margin.............................. M. kinsa sp. nov. 15 Scape subequal to pedicel; middle leg without modifications.................................... M. trepta Hall, 1976 - Scape much shorter than pedicel; middle leg with modifications, first tarsomere with two ventral spines and third tarsomere laterally flattened and wide................................................................ M. pisqa sp. nov. FEMALES 1 Legs black, knees at most yellow and occasionally underside of femora narrowly yellow............................ 2 - Legs predominantly yellow, sometimes basal half femora and tips of tarsi blackish................................. 7 2 Proboscis projecting beyond oral margin less than height of eye................................................ 3 - Proboscis equal to or longer than eye height................................................................ 5 3 Light colored stripe on lateral margin of mesonotum inside above near transverse suture, but not interrupted at transverse suture; scutellum entirely black.......................................................................... 4 - Lateral pale stripe broadly interrupted at transverse suture; scutellum white with posterior margin narrowly black.............................................................................................. M. orthis Hall, 1976 4 Frons black, narrowly yellow above antenna; first abdominal tergite yellow............. M. hyalinipennis (Brèthes, 1919) - Frons whitish on lower ¾, black on upper fourth; first abdominal tergite yellow on posterior margins..... M. pisqa sp. nov. 5 Scutellum black, or black in middle and yellow at sides...................................................... 6 - Scutellum entirely yellow, never with black................................................ M. citrina Hall, 1976 6 Proboscis equal to eye height or nearly so............................................... M. brachytis Hall, 1976 - Length of proboscis at least three times height of eye........................................ M. macra Hall, 1976 7 Abdominal dorsum black, first segment yellowish white in middle of posterior margin only, rest of abdominal segments narrowly fasciate with yellow-white across their posterior margins or Abdominal dorsum black, tergite I entirely yellow or at least posterior and lateral margins of all segments yellow...................................................... 8 - Abdominal dorsum nearly entirely yellow; only extreme bases of all segments black, black color most extensive on two basal segments......................................................................... M. diasema Hall, 1976 8 Proboscis at most equals eye height, usually less........................................................... 11 - Proboscis projecting at least twice eye height, usually more, frons marked with a small black stripe.................... 9 9 Halter black, at least dorsally;........................................................... M. problis Hall, 1976 - Halter whitish...................................................................................... 10 10 Frons with conspicuous dark stripe on upper half; lateral margin of mesonotum (notopleural and supraalar regions) black emarginate above notopleural suture; spermathecal reservoir fusiform, extending to abdominal segment V ... M. kinsa sp. nov. - Frons with faint dark stripe at middle; lateral margin of mesonotum shallowly emarginate above notopleural suture; spermathecal reservoir knob-like, extending to abdominal segment III.......................................... M. tawa sp. nov. 11 Abdominal segments narrowly yellow on posterior margins, bases broadly black, not reduced in extent posteriorly....... 12 - Posterior margin of abdominal segments broadly yellow, amount of black color at base reduced posteriorly............ 13 12 First flagellomere at least four times longer than scape and pedicel combined; frons black, lower half yellow; halter knob entirely yellow;................................................................. M. collina (Philippi, 1866) - First flagellomere at most three times as long as scape and pedicel combined; frons yellowish, upper ¼ dark brown; halter knob whitish, usually dark brown dorsally......................................................... M. iskay sp. nov. 13 Mesonotum with ground color brownish yellow, with three thick longitudinal bands................................................................................... M. bilobata Ramos-Pastrana, Rojas-Portilla & Evenhuis, 2024 - Mesonotum black with yellow markings, without longitudinal bands............................................ 14 14 Frons black with a small triangular yellow spot above antenna; lateral margin of mesonotum not emarginate above notopleural suture.............................................................................. M. trepta Hall, 1976 - Frons whitish yellow, except right below the ocellar triangle, dark brown; lateral margin of mesonotum broadly emarginate above notopleural suture.................................................................... M. huk sp. nov.