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Insects and their Allies  
 
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One pair of membranous wings Two pairs of membranous wings
1 pair of membranous wings present 2 pairs of wings present.

Hind wings may be hidden under hardened forewings (beetles, true bugs and earwigs), hooked to forewings (bees and wasps), or wings may be covered in scales (moths and butterflies
 

 

Entomology CSIRO