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Couplet 170
170a: Pretarsal claw with a ventral blade or elongate lobe beneath (reduced to a large, fused tooth ending about 7, length of upper blade in Phodaga, U.S. Southwest); head sharply or gradually constricted behind eyes to distinct neck
170b: Pretarsal claw without ventral blade or elongate lobe beneath, if claw-toothed or appendiculate, then not as in preceding entry; head constricted or not
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