Need help getting certian bugs

Some Bugs are in certain months. If you walking around a see a animal looking down at the ground. Go there an dig where he is lookning, then a bug will jump out of the hole, you chase him with the net to catch him. Also If you leave a clump og grass alone for a long tome it starts to smell an bugs will come to it too. But it's a pain to get rid of. And different times of the day helps too, even at night you will find them. So look in the mornings, afternoon, evening an night time for all kinds of bugs. Do this in every month.

Are you talking about the trantula? The trantula can also jump, leap on you. The best thing to {What I do} is have a Fishing rod or another tool out and you hear a certain sound that sounds funny that's the trantula! {Most likely can be a Scropin} { The trantuls most likey comes in June} The scropin ONLY come in July!}{ The scropin makes a rattle sound the trantula does it a little bit different} Anyway, Get behind the trantuula when you have a DIFFERENT TOOL DON'T HAVE THE NET OUT YET! { But be careful you DON'T SCARE IT AWAY IT WILL JUMP IN THE WATER} When your behind it, then get your net out and snacth it! { Make sure it doesn't turn around} That's all! {same with Scropin}

If you have a coconut tree you shake the coconuts off of it and switch to night and as long as it isn't anything but summer you can catch these huge beetles like the Goliath beetle, Elephant beetle, Herculees beetle, and another one but I forgot what it is called.

There are different types of Bugs at different times of the day and month.
Below, someone's stated about beetles.
So if you're looking for a Robust/Brown/Walker Cicada, Cockroach, Emerald Fruit Beetle, Jewel Beetle, Longhorn Beetle (Other types which I've forgotten) or a Walkingstick. You can find all these on the trees, in Summer, June/July Day or Night.
However, if you're trying to catch either of these insects, you MUST approach carefully otherwise they'll fly away.
The group of Cicada's just fly to a different tree, but the others may disappear.
Have your net ready, slowly approach then swing.

Heres some help with rare or expensive Bugs:
Change the date to the 9th of august whatever year you want at 2:00,make sure you have at least 2 coconut trees and go out with you net and here are the Bugs you might find: ( and by the way they will be on your normal trees too )
Elephant beetle: 7.000 bells
Stag beetle: 2.000 bells
Saw-stag beetle: 2.000 bells
Giant beetle: 10.000 bells
Rainbow stag: 10.000 bells

And so on hope this helped !!!