Description of Chironomus decumbens

From information in Townes (1945)
(known only from type specimen)

Male:    Wing length 4.7 mm; fore LR 1.27; BR about 4.0; antennal ratio 4.5.
              Body of medium stoutness.
              Frontal tubercles of moderate size, clypeus rather small.
              Middle portion of pronotum hardly widened; mesoscutum without a tubercle.
              Fore tarsus with a rather short depressed beard, arising at about 40o to 45o.
              Blackish brown, legs slightly paler.
              Hypopygium with very narrow anal point reaching about to midpoint of gonostylus, with IVo about the same length; superior volsella of Strenzke’s E-type.  Towne's figure appears to show about 17 setae on tergite IX, Sublette's adult has only about 10 in a number of pale spots.


Male hypopygium of the type of C. decumbens (from Townes 1945)

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Modified: 8 April 2021
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