huge abdomen
When an arthropod abdomen is huge.
For an anthro character, this means that the abdomen's length should be bigger than the rest of the upper body combined, up to the size of the entire body combined including legs.
For a real-life feral insect, huge is the "normal" size, as the abdomen is normally bigger than the rest of the body. See https://carolinahoneybees.com/wp-content/uploads/2024/01/size-of-bees.jpg and https://entnemdept.ufl.edu/creatures/MISC/MOTHS/04polyphemus.jpg