Key to common families of insects in the Niagara region

19a) Body robust, pronotum distinctly wider than abdomen. Inner and outer margins of
metathoracic wingpads strongly diverging from axis of the body. Gills may be present on
pronotum in neck region. 20




19b) Body elongate, pronotum barely wider than abdomen. Metathoracic wingpads lie parallel
with axis of body. Gills absent. 21




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