Where'd they all come from?

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I thought it was just my imagination until I saw a Facebook discussion on it yesterday... millions of ladybugs have descended on St Louis.  We talked about it this morning and callers told us they weren't really ladybugs, but actually were Asian Lady Beetles.  Whatever they are, I hope they leave soon.  I had one in my car yesterday riding shotgun.  Another caller told us you can't just kill 'em and leave 'em in the yard because they're scent attracts others... even when dead!  So, in the words of one listener, "You have to flush the carcass."