Chironomus mongolheius Sasa & Suzuki 1997

Males:
Body length 8.32 (6.28-9.86) mm; 3.63 (2.88-4.22) mm, WW/WL 0.27 (0.26-0.28), R-M area dark; AR 4.35 (3.98-4.75); VR 1.05 (1.03-1.07) or 0.95 (0.93-0.97).
Frontal tubules prominent, 38 x 11 µm.  Eyes bare, ER 0.23 (0.13-0.29); palp relatively short.
;Ground color of scutum and scutellum yellow, stripes brown-dark brown, postnotum dark brown, leg segments almost uniformly brownish-yellow, with TaV darker, and without dark rings.  Abdominal tergites almost uniformly brown, but Tergites VII and VIII with pale area along caudal margin.
fLR 1.37 (1.25-1.46); mLR 0.54 (0.49-0.57); hLR 0.65 (0.62-0.68); BR 5.3 (3.3-7.8).

Antenna and terminalia of C. mongolheius from Sasa and Suzuki (1997)

TIX shown with about 17 medial setae.  Superior volsella of the E-type of Strenzke (1959).br/> Anal point relatively short, narrow and constricted at base; gonostylus smoothly rounded and not constricted near apex.

Pupa, Larva and Cytology: Not described.

Somewhat similar to C. plumosus (Linnaeus), but not as large and gonostylus much more swollen.

Found:    Mongolia - (Type locality) Bogd, Gobi Desert (1500 m).