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Couplet 100
100a: Head distinctly prognathous, mandibles strongly projecting forward (Figure 26-43A); fore femur widened medially and armed externally with strong spines (Figure 26-43A); mid tarsus with 4 tarsomeres Heteroceridae p.420
100b: Head distinctly hypognathous, mandibles either directed ventrad or hidden (Figure 26-43B); fore femur simple, neither widened medially nor armed with large spines; mid tarsus with 5 tarsomeres
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