There are Four areas we can look at, that I am aware of, of how we could do frequency
1) Natural Frequency: We stick strictly to how common a creature is in the wild
2) Stereotype: We can create stereotypes of each biome, possibly based on real life locations and adjust frequency according to how "Exotic" they seem.
3) Vanilla Stereotype: We prioritize creatures according to how they seem to fit in the game such as mountain goats.
4) Exemplar: We can also increase the frequency of some creatures due to how they represent their category. For example the Ladybug is the best representative of the Ladybird family even if it may not be the most common (example).
Any combination of the above can be used. Though we will need to come to a decision (or have Toady decide) about this.
Alright so I call into order the attention of the project workers. Many of the insects I am going to find will not have proper names, which is unfortunate, or share names with an entirely different animal (As with some of the Tiger Beetles). So here is my proposed solution so I don't have to skip them.
I am going to post all the insects and butterflys I find that fall under that category. I am going to list its scientific name, then my personal suggested name (Ill use *Blank* if I cannot think of one) and then Ill link you to that creature. I may also include under it a reason why I even chose it.
You can refute or suggest another name or refute the creature as a whole "We don't need that creature"
Example:
-Leptodirus hochenwartii (Amber Cave Beetle):
http://en.wikipedia.org/wiki/File:Leptodirus_hochenwartii.jpg--Including being one of the few true cave dwelling creatures. It also looks like it is made of Honey/Amber. Looks like an Ant though.
I am entirely for a better name then Amber Cave Beetle... though the only one I thought of is "Amber Statuette"