Key: Step 324. Chironomini 221 Polypedilum

324a. Cephalic tubercles conical, 50-60µm long (125k.jpg). Thoracic horn a bush of fine filaments (about 50).

Polypedilum tetracrenatum

324b. Cephalic tubercles rounded or rounded-conical (125m.jpg). Thoracic horn of about 8 broad filaments.

Step 325. Chironomini 222 Polypedilum
Decision path