Mythicomyia (Heterhybos), 1919

Ramos-Pastrana, Yardany & Rojas-Portilla, Edilberto, 2024, First record of Mythicomyia Coquillett, 1983 from Colombia with description of a new species of Mythicomyia (Heterhybos) Brèthes, 1919 (Diptera: Mythicomyiidae: Mythicomyiinae) and an updated key to South American species, Zootaxa 5397 (4), pp. 539-550 : 548

Key to the South American species of Mythicomyia (Heterhybos)

[modified from Hall (1976)].

1 Eyes holoptic.................................................................................... Males

- Eyes dichoptic................................................................................. Females

MALES

1 Knob of halter black, usually white below and at apex.................................................... 2

- Halter knob white or yellowish above and below............................................................ 6

2 Proboscis short, less than height of eye................................................................. 3

- Proboscis longer, either equal to or greater than height of eye.................................................. 4

3 Postpronotal lobe entirely black, posterior margin in some specimens brownish............ M. (H.) collina ( Philippi, 1866)

- Postpronotal lobe white or yellow........................................................................ 5

4 Mesonotum entirely dark brown ( Fig. 6 ); legs predominantly whitish, with light brown to brown spots in some of its structures ( Fig. 3 ).......................................................................... M. (H.) bilobata sp. nov.

- Mesonotum with light colored stripe on lateral margin of mesonotum incised above near transverse suture, but not interrupted; legs usually entirely black................................................ M. (H.) hyalinipennis ( Brèthes, 1919)

5 Proboscis not longer than height of eye, usually less................................... M. (H.) brachytis Hall, 1976

- Proboscis long, projecting at least twice eye height beyond oral margin....................... M. (H.) problis Hall, 1976

6 Middle tibia straight................................................................................... 7

- Middle tibia curved arcuate on basal half, best seen in lateral view...................... M. (H.) trepta Hall, 1976

7 Length of proboscis from oral margin equal to or greater than height of eye....................................... 9

- Length of proboscis from oral margin less than height of eye................................................... 8

8 Scutellum dull black................................................................ M. (H.) orthis Hall, 1976

- Scutellum whitish yellow..................................................... M. (H.) pusillima Edwards, 1930

9 First abdominal segment narrowly yellow in middle; diadem absent......................... M. (H.) citrina Hall, 1976

- First abdominal segment entirely black, diadem present................................... M. (H.) macra Hall, 1976

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................................. 6

2 Proboscis projecting beyond oral margin less tan height of eye............................................ 3

- Proboscis equal to or longer than eye height................................................................ 4

3 Light colored stripe on lateral margin of mesonotum inside above near transverse suture, but not interrupted at transverse suture; legs usually black................................................. M. (H.) hyalinipennis ( Brèthes, 1919)

- Lateral pale stripe broadly interrupted at transverse suture; legs black but knees yellow........... M. (H.) orthis Hall, 1976

4 Scutellum black, or black in middle and yellow at sides....................................................... 5

- Scutellum entirely yellow, never with black............................................ M. (H.) citrina Hall, 1976

5 Proboscis equal to eye height or nearly so.......................................... M. (H.) brachytis Hall, 1976

- Length of proboscis at least three times height of eye..................................... M. (H.) macra Hall, 1976

6 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...................................................... 7

- Abdominal dorsum nearly entirely yellow; only extreme bases of all segments blacks, black color most extensive on two basal segments............................................................. M. (H.) diasema Hall, 1976

7 Proboscis at most equals eye height, usually less............................................................. 8

- Proboscis projecting at least twice eye height, usually more, middle of frons marked with a small black stripe............................................................................................ M. (H.) problis Hall, 1976

8 Abdominal segments narrowly yellow on posterior margins, bases broadly black, not reduced in extent posteriorly.................................................................................... M. (H.) collina ( Philippi, 1866)

- Posterior margin of abdominal segments broadly yellow, amount of black color at base reduced posteriorly.............. 9

9 Antenna dark brown ( Fig. 15 ); mesonotum with ground color brownish yellow, with three thick longitudinal bands ( Fig. 17 )................................................................................. M. (H.) bilobata sp. nov.

- Antenna black; mesonotum black with yellow markings, without longitudinal bands............. M. (H.) trepta Hall, 1976

Figures

FIGURES 3–8. Mythicomyia (Heterhybos) bilobata Ramos-Pastrana, Rojas-Portilla & Evenhuis, sp. nov. (LEUA). Male. 3. Habitus, left lateral view; 4. Head, frontal view; 5. Antenna; 6. Thorax, dorsal view; 7. Wing; 8. Abdomen, dorsal view.

FIGURES 15–20. Mythicomyia (Heterhybos) bilobata Ramos-Pastrana, Rojas-Portilla & Evenhuis, sp. nov. (LEUA). Female. 15. Habitus, left lateral view; 16. Head, frontal view; 17. Thorax, dorsal view; 18. Abdomen, dorsal view; 19. Terminalia; 20. Terminalia illustration.