Previous Step (16b)
17a Vertex of head usually tricarinate, one median carina and two supplementary. Antennae flattened throughout, distal segments becoming slightly wider. Internal spurts of caudal tibia decidedly unequal.
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17b Vertex of head at most with a slight indication of a median carina. Antennae not flattened or flattened proximally, no widening of distal segments. Internal spurs of caudal tibia equal or only moderately unequal. go to 18
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