The only other order of insects bearing two true, functional wings plus any form of halteres are the Strepsiptera, and in contrast to the flies, the Strepsiptera bear their halteres on the mesothorax and their flight wings on the metathorax.
The only other order of insects are the Strepsiptera. These insects are bearing two true, functional wings plus any form of halteres. The Strepsiptera bear their halteres on the mesothorax. This is in contrast to the flies. The Strepsiptera bear their halteres on their flight wings on the metathorax. This is in contrast to the flies.