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Couplet 106
106a: Legs retractile, rotated forward in repose, with tibia held anterior to femur; fore femur with flange on posterior face covering tibial excavation, fore tibia grooved to receive tarsus; usually with margined excavations on propleuron, mesosternite and ventrites to receive legs
106b: If legs retractile, fore tibia held posterior to or ventral to femur; fore femoral flange, if present, located on anterior face
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