Although they are divided into types based on their species, most insects can be found all over a Planette or Islet, outside of the beach and Intertidal Zone, with spawn locations being shared amongst various types.
The type of an insect acts more as an indicator of how they move around, or what time of day they might be found at, rather than them having a specific capture mechanic or specific location, because unlike Fish or Shore-Dwellers, which do have varying capture mechanics, most insects can be approached in any way and caught with a simple swipe of the Insect Net, although some might be easier to capture when approached slowly.