Collecting & Preserving Insects?

I have caught a few insects (butterflies, dragonflies and bees). I have also mounted them with a pin on pieces of styrofoam. Now they start smelling bad and I think I should dry them in an oven. What is the temperature I should put them in and for how long? Should I put formalin on them before or after I dry... show more I have caught a few insects (butterflies, dragonflies and bees). I have also mounted them with a pin on pieces of styrofoam.

Now they start smelling bad and I think I should dry them in an oven. What is the temperature I should put them in and for how long?

Should I put formalin on them before or after I dry them in the oven?
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