Here's the link to a published paper Increase in tracheal investment with beetle size supports hypothesis of oxygen limitation on insect gigantism
Thanks. That's a start, at least. However, a quick perusal of the paper suggests that we are talking increased size, not increased number, when it comes to tracheas, contrary to your stated theory.
This supports my hypothesis that if the eyewitness sightings of giant dragonflies are correct,
You mean your one drunk eyewitness?
No record of giant dragonflies for the last god knows how many million years, not one specimen in a museum anywhere, not a single report by a biologist, not even one blurry photo.......nothing other than the blatherings of one drunk guy. That's not a good start to your hypothesis, now is it?
then the leg segmentation of the exoskeleton wouldn't allow sufficient flexibility for normal walking. Therefore the male giant dragonfly, if injured or exhausted or suffering from 'insect frostbite', would have to hop on it's tail using it's wings for assistance.
Makey-uppey tosh
I'm assuming that the clasper-less females would migrate to sunnier climates and the male stay to defend their prime den sites and territory.
Makey-uppey tosh
Wonderful what biologists can find out when they study the real world, isn't it?