Euorthocladius, Thienemann, 1935

Key to adult males of subgenera Euorthocladius and Orthocladius s. str. in China

1. Scutellars biserial or multiserial.......................................................................... 2

–. Scutellars uniserial.................................................................................... 6

2. AR <0.5, anal point 35 µm long......................................................... O. ( E.) angustus View in CoL sp. n.

–. AR> 1.0, anal point longer than 50 µm.................................................................... 3

3. Superior volsella widely triangular, gonostylus curved........................................ O. ( E.) flectus View in CoL sp. n.

–. Superior volsella not widely triangular, gonostylus straight..................................................... 4

4. Anal lobe produced; virga well developed.................................................................. 5

–. Anal lobe not produced, almost right-angled; virga absent or vestigial..................... O. ( E.) suspensus (Tokunaga) View in CoL

5. Inferior volsella with dorsal part wide and squared, palpomere 3 longer than 4.................. O. ( E.) kanii (Tokunaga) View in CoL

–. Inferior volsella with dorsal part slender, palpomere 3 shorter than 4........................ O. ( E.) thienemanni Kieffer View in CoL

6. Vein Cu 1 nearly straight, gonostylus with concave inner margin.............................. O. ( O.) makabensis Sasa View in CoL

–. Vein Cu 1 curved, gonostylus without concave inner margin..................................................... 7

7. Inferior volsella with ventral part fully covered by dorsal part............................. O. ( O.) manitobensis Saether View in CoL

–. Inferior volsella with ventral part not fully covered by dorsal part.............................................. 8

8. Inferior volsella with dorsal part long and narrow............................................................ 9

–. Inferior volsella with dorsal part short and broad........................................................... 10

9. LR 1 about 0.59–0.68 and AR about 1.40–1.70........................................... O. ( O.) rhyacobius Kieffer View in CoL

–. LR 1 about 0.71–0.79 and AR about 2.00–2.35........................................... O. ( O.) excavatus Brundin View in CoL

10. AR 1.58–2.12, gonostylus with a median projection.............................. O. ( O.) nitidoscutellatus Lundström

–. AR 2.5–3.0, gonostylus without median projection............................... O. ( O.) glabripennis (Goetghebuer) View in CoL