Amphimallon solstitialis and Serica brunnea

I once caught Amphimallon solstitialis as a child, but I let it go out of my stupidity, thinking that it was a small May beetle! Since then, I have never seen this species in my life.
With Serica brunnea, the situation is almost the same: a few years ago, I found a dilapidated beetle (without legs and belly) in early May, and since then this is the only specimen in my collection.
Who knows, please help me catch these animals!!!

Serica brunnea in Flax.the plane flies briskly to the light - no more than three days ago (on Saturday) arrived. If necessary, I can collect it...

Near Gatchina

Amphimallon solstitialis in Yaroslavl flies right in the city, larvae develop in lawns... It usually flies at dusk. but a couple of days ago, I knocked down a flying beetle right during the working day, and the second one was "caught" by a sparrow! so these "animals" are still flying...Serica brunnea usually flies in the first half of July, but this year may be delayed. In the Leningrad region, both types should be available, I have seriki from Finland (Helsinki).

Maybe there aren't enough of them in the Leningrad region?
Although near Gatchina M. hippocastani flew a lot in May.
I went to the same place in June-July - I didn't see anything!

In the Tver region, where I caught krushch and seritsa, I removed the nets from the windows at night and tried to catch them. Nothing flew but mosquitoes and all sorts of earwigs-moths, although it was mid-July, and the night was warm!

There are some mystical phenomena with insects. And the beetle is ordinary and everyone catches it, but it doesn't suit you and that's it. I have such garbage with Selatosomus cruciatus. Everywhere they write that the beetle is for Flax.It's the usual one, but it doesn't suit me, that's all. Zhotia beetle is rather big, with a daytime and open lifestyle. Riddle....

beetleslov:
it is best to watch in the evenings on the lawns, when it is just beginning to get dark.