Key: Step 194. Chironomini 91 Chironomus

194a. Tracheoles of thoracic horn wide, 3-3.5µm in diameter, 9-12 tracheoles across the wider end of the tracheolar patch.

Chironomus pe33

194b. Tracheoles of thoracic horn narrow, about 2.5µm in diameter, about 17 tracheoles across the wider end of the tracheolar patch.

Chironomus pe35
Decision path