Naraku
Draconarius
Insects can't get very big. The reason is the square-cube law. This states that as an object increase in size, its volume increase at a greater rate. If you square an insect's size, you cube its internal volume, which means you cube its mass.Indonesia is a hotbed of biological diversity. It's also a place (like the United States in the 19th and early 20th centuriues) with a growing population and a natural resources economy that is wiping things out. You wonder how big insects (with no internal skeleton) can get. Apparently there were huge dragon flies millions of years ago. You also wonder what the venom (if any) of this bee is like.
https://en.wikipedia.org/wiki/Square–cube_law
This has two negative effects. The first is that the increased mass would crush the insect. Large animals like elephants and the giant dinosaurs coped by having large bones. An insect doesn't have bones, so, in order to support the increased mass, it would have to have a thicker exoskeleton. The large the exoskeleton becomes, the thicker and heavier it becomes. Beyond a certain point, the exoskeleton would become so thick, the insect couldn't move. Those giant bugs from50s movies; they'd wouldn't be much threat to anyone, even to B-movie actors
The second problem is breathing. Insects don't have lungs. They "breath" by a passive diffusion system. Air comes into their bodies through tubes that extend from pores in their exoskeletons and branch out throughout their bodies where it diffuses to their organs. Insect blood doesn't carry oxygen, only nutrients and waste. Since there is no pumping system, if an insect gets too large, the tubes to the internal organs will be too long to allow sufficient oxygen to reach them.
The giant dragonflies you refer to existed in the late Paleozoic Era (359 to 252 million years ago). at that time the oxygen levels were much greater than today. This allowed more oxygen to diffuse within the insects body. Such a large insect would suffocate in today's atmosphere.