I see OurABC is onto this - so most of what I have seen in my...

I see OurABC is onto this - so most of what I have seen in my rain gauge over months would be the Argentinian scarab beetles

Invasive Argentinian scarab beetles being mistaken for Christmas beetles 9Dec23
https://www.abc.net.au/news/2023-12-09/christmas-beetles-easily-mistaken-for-argentinian-scarab-pest/103206128

to sum up the al least 3 species I have see - most common first -
the Argentinian scarabs would be most common -
then a species chestnut in colour with black marks - sort of incomplete fiddle pattern -
then the rarer fiddle beetle with the lime green patterns