Chironomidae Exuviae
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Chironomidae Exuviae
Key: Step 257. Chironomini 154 Parachironomus

257a. Tergite armament of Parachironomus pattern (Note Ci153) but tergite II with a posterior transverse point band extended forwards a short distance on each side of mid-line, and the posterior points of tergite VI not conspicuously larger than those preceding and not set on a postero-median flap (112i.jpg).

Parachironomus frequens

257b. Tergite armament not of Parachironomus pattern. (If approaching this, then the armament of tergite II extends over much of the tergite.).

Step 258. Chironomini 155
Decision path