Castaway - Jade Beetle

Can you help me - i've gone under every rock and can not find a Jade Beetle to trade for the hammer handle from Dr in order that i make the canoe to get the mango and lime and curry dish - this has gone on for a week now and am getting frustrated and bored.

I'm not sure which rock it's under but you have to clear all the bugs without missing one then a second round of them will come out that's where you get the jade and more rare bugs .