Elachiptera

Mlynarek, Julia J. & Wheeler, Terry A., 2008, Revision of the Costa Rican species of Elachiptera (Diptera: Chloropidae), Zootaxa 1754, pp. 41-51 : 42

Key to the Costa Rican species of Elachiptera

1. Thorax black................................................................................................................................................2

- Thorax entirely or mostly yellow................................................................................................................4

2. Wing with dark infuscations along R4+5 and CuA1 ( Fig. 6) ............................................................. E. fucosa

- Wing hyaline................................................................................................................................................3

3 Frontal triangle short, half to two-thirds length of frons; arista strongly tapering, slender in distal third ( Fig. 2 ) ................................................................................................................................. E. coniotrigona

- Frontal triangle reaching or almost reaching anterior margin of frons; arista broad to apex ( Fig. 26 ) ......... ............................................................................................................................................. E. sacculicornis

4. Gena 0.25 times eye height ...............................................................................................................E. sp. A

- Gena 0.1–0.15 times eye height...................................................................................................................5

5. Scutum entirely yellow along dorsocentral lines.........................................................................................6

- Scutum with black dorsocentral lines, tapering posteriorly.........................................................................7

6. Arista parallel-sided almost to tip ( Fig. 12 ); male surstylus as in Fig. 15 .............................. E. melinifrons

- Arista tapering in distal half, very slender at tip ( Fig. 22 ); male surstylus as in Fig. 25 ............... E. rubida

7. Arista strongly tapering distally, very slender on distal fourth (as in Fig. 2 ); male surstylus evenly recurved ..................................................................................................................................... E. attenuata

- Arista evenly tapering to tip ( Fig. 18 ); male surstylus long, straight and narrow ( Fig. 21 ) .... E. queposana

Figures

FIGURES 1 – 5. Elachiptera coniotrigona. 1. head, dorsal. 2. head, lateral. 3. scutellum, dorsal. 4. male genitalia, posterior. 5. male genitalia, lateral. Abbrevations: cer—cercus; epd—epandrium; fr tr—frontal triangle; sur—surstylus. Scale bars = 0.2 mm (Fig. 1); 0.1 mm (Figs. 3, 4).

FIGURES 26 – 29. Elachiptera sacculicornis. 26. antenna. 27. scutellum, dorsal. 28. male genitalia, posterior. 29. male genitalia, lateral. Scale bars = 0.2 mm (Fig. 26); 0.1 mm (Figs. 27, 28).

FIGURES 12 – 16. Elachiptera melinifrons. 12. antenna. 13. scutellum, dorsal. 14. male genitalia, posterior. 15. male genitalia, lateral. 16. male hypandrial complex, ventral. Scale bars = 0.2 mm (Fig. 12); 0.1 mm (Figs. 13, 14).

FIGURES 22 – 25. Elachiptera rubida. 22. antenna. 23. scutellum, dorsal. 24. male genitalia, posterior. 25. male genitalia, lateral. Scale bars = 0.2 mm (Fig. 22); 0.1 mm (Figs. 23, 24).

FIGURES 17 – 21. Elachiptera queposana. 17. head, dorsal. 18. head, lateral. 19. scutellum, dorsal. 20. male genitalia, posterior. 21. male genitalia, lateral. Scale bars = 0.2 mm (Fig. 17); 0.1 mm (Figs. 19, 20).