81a (80b).    Mouthparts distinctly mandibulate, with opposable mandibles; spiracles usually

              present on thorax and 8 abdominal segments; body shape variable [beetle larvae].....Coleoptera

 

 

81b.    Mouthparts as previously described or with mouth hooks somewhat parallel and moving

              vertically; spiracles variable, but usually not as previously described; body elongated

               [Nematocera & some Brachycera fly larvae]....................................................……................. Diptera