Einfeldia Kieffer

Saether, Ole A., 2012, The Chironomus group (Diptera: Chironomidae) in Lake Winnipeg, Canada, Zootaxa 3275, pp. 1-19 : 16-17

Key to Nearctic males of Einfeldia Kieffer , Benthalia Lipina and Chironomus subgen. Lobochironomus Ryser, Wülker et Scholl

1. Thorax and abdomen brown to blackish brown; frontal tubercles large, about twice as long as wide; LR1 1.7–2.2; haltere knob brown or pale........................................................................................ 2

- Thorax pale green with ochraceous to brownish-black markings, abdominal tergites uniformly green or mostly brown, frontal tubercles small to absent, LR1 1.3–1.7, haltere knob pale....................................................... 6

2. Anal point strongly spatulate, at least 1.8 times as wide at apex as at narrowest point; wing length greater than 2.1 mm; haltere knob brown or pale.................................................................................... 3

- Anal point only slightly spatulate, less than 1.5 times as wide at apex as at narrowest point; wing length less than 2.0 mm, haltere knob pale....................... Chironomus (Lobochironomus) austini Beck et Beck ( Beck & Beck 1970 fig. 7g).

3. LR1 1.46–1.78, sensilla chaetica 3–10 in apical third of each of p2 and p3, several acrostichals, frontal tubercles moderately large............................................................................................... 4

- LR1 1.87–2.20, sensilla chaetica 23–31 in apical 2/3 of each of p2 and p3 (at least in B. brunneipennis ), acrostichals few or absent, frontal tubercles very large....................................................................... 5

4. Superior volsella with the broad and flat apical part partly immersed in the basal part and its microtrichia ( Fig. 8 C), LR1 1.7–1.78, dorsocentrals 16–30, tergite IX with 32–38 setae......................... Chironomus (Lobochironomus) sp.

- Superior volsella with apical part more narrow and less immersed in basal part, LR1 1.46–1.60, dorsocentrals 38–42, tergite IX with 3–13 setae................................................... Chironomus (Lobochironomus) mendax Storå

5. Basal part of superior volsella foot-shaped ( Fig. 8 A, B), wing length 2.8–3.1 mm............................................................................................... Benthalia brunneipennis (Johannsen) ( Fig. 8 A, B).

- Basal part of superior volsella club-shaped ( Sublette 1964 fig. 40, 41), wing length less than 2.7 mm......................................................................... Benthalia natchitochea Sublette (Sublette 1964 fig. 40–41).

6. Basal abdominal tergite mostly brown, LR1 about 1.7................................................................................................... Chironomus (Lobochironomus) dorsalis (Meigen) ( Townes 1945 fig. 127).

– Basal abdominal tergite uniformly green, LR1 1.3–1.6........................................................ 7

7. Anal point slightly spatulate and relatively narrow, Gonostylus not inflated, not abruptly constricted before apex........................................................................... E. chelonia Townes (Townes 1945 fig. 129).

- Anal point very broad, gonostylus inflated and abruptly constricted before apex............................................. Einfeldia pagana (Meigen) ( Townes 1945 fig. 128; Oliver 1971 fig. 1–4 as E. synchrona Oliver , fig. 5 as E. pagana )

Figures

FIGURE 8. Hypopygium. A, B: Benthalia brunneipennis (Johannsen). C: Chironomus (Lobochironomus) sp.