The beetles start to appear mid-May to mid-June but running a bit late this year.
Am wondering if I'm actually going to get any or whether last year's hatch was the last one. It depends on when eggs were last laid at the site.
I've built a second home for them where eggs will hopefully be laid. Adults beetles won't emerge until 2020 and beyond though. If you think the beetles are big then the larvae can grow to over 4" long!