Key to common families of insects in the Niagara region

32a) Dorsal surface of each thoracic segment covered with a single plate (sclerite). Branched
gills on ventral surface of abdominal segments. Not in a case. HYDROPSYCHIDAE

32b) Dorsal surface of last thoracic segment not covered by a single sclerite. Branched gills
may not be present on ventral surface of abdomen. Organism may be in a portable case. 33




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