Key to common families of insects in the Niagara region

50a) Last abdominal segment terminating in a single lobe, sometimes bearing a single spine. Abdominal segments 1-7 girdled with 3-4 pairs of pseudopods (setae-bearing swellings). TABANIDAE

50b) Last abdominal segment terminating in 1-4 rounded lobes bearing apical setae. Abdominal segments with one pair of prolegs or a single ventral welt. EMPIDIDAE




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