Key to common families of insects in Spencer Creek

58a) Head capsule partially to fully retracted into thorax. Dorsal surface of last abdominal segment generally with a pair of rounded darkened spiracles bordered by 1-3 pairs of short lobes that may be fringed with short to long hairs. Finger-like gills may be present on ventral surface of last segment. TIPULIDAE

58b) Head capsule lacking. 59




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