[CynicalBear]

>>What can I do to get rid of them in the soil?<<

I noticed that you also posted you planted onions there. I would dig one up in a week and see what you have. If the bugs are still there I wouldn't plant anything there until late summer. Until then cover the ground with black plastic and let it cook in the sun all summer.

[Roos_Girl]

Ok, thanks. I’ve done that before to kill weeds off, but never for bugs.

[Tilted Irish Kilt]

CynicalBear :" If the bugs are still there I wouldn't plant anything there until late summer.
Until then cover the ground with black plastic and let it cook in the sun all summer. "

Mostly agree with you .
Till up and loosen the soil( even in raised bed) , then put plastic over it to sterilize the soil.
The reason why I suggest some tillage is to get the heat down deeper into the soil, until the soil temp registers either 160 degrees, or at least 140+ degrees for 5 days.