Traps

And from your own experience, can anyone tell you about catching butterflies on baits? What to mix with what?!

It depends on which butterflies you are going to attract. Scoops are willing to go to any wandering abomination, and almost any. I wet white cotton cloths and hang them out wherever I can. Most hawks prefer flowers. Best of all white and with a long whisk. Bedstraw, euphorbia, all wine phloxes, cloves. Convolvulus-an ideal option-sweet tobacco, slightly worse than petunias, datura. For diaries, the ideal option is fermented beer with dried fruits and sugar.

Once I found a vodka bottle. it's full of dung beetles, gravediggers, and ground beetles. Encouraged by this, I set up a few traps with "burnt" vodka-almost nothing. But the homeless people didn't bite either...

Maybe the vodka bottle was not vodka, but something else? For example, moonshine?
In general, moonshine seems to me a more promising substrate for attracting beetles than vodka: after all, it contains in abundance the very fusel oils that are products of microbial fermentation (and in a concentrated form as a result of distillation), and from which vodka is purified. They are quite volatile, and evaporating, can attract insects. By the way, one of the substances that make up these fusel oils is ethyl acetate, which is so well known to all entomologists (of course, in very small quantities).
Of course, choosing such fillers for traps, you can go far: why not, for example, try to attract insects associated with wormwood, traps with absinthe?
Insects are sometimes attracted by seemingly unattractive things: in a book by P. Marikovsky, I read about how a whole cloud of aphodiuses flew to the smell of gasoline from primus, and some small bug (I don't remember the name) - to the smell of zinc whitewash, which was made on the basis of poppy oil.

2Omar
We set traps intuitively. if near the river, then in the zone of periodic flooding, however, traps can "go to the bottom". At the onset of the dry period (in the Yaroslavl region), it was not caught anywhere...

Are there any indirect signs of a bug trail, or is there only one way out-groping at random?

Usually, the location is chosen intuitively. I can share my experience in terms of choosing biotopes when catching ground beetles (and other soil coleoptera). A very good catch occurs in floodplain forests, water meadows and mixed and small-leaved forests. Dry meadows and coniferous forests usually do not have a rich species composition. The main factor for ground beetles is the presence of a well-developed litter and sufficient humidity.
I usually set 20 traps every 5 meters. It is best to have them somewhere-a thread in the grass or bushes. In open areas, the catch is usually less. Quite interesting fees can be made on the beaches and along the banks of swamps. But there you need to make sure that the traps are not flooded.

here I have the cheapest and worst beer, dry yeast, sugar and a few meters of hunting grooves in the forest, in which I'm going to put glasses of beer. I would like to advise you how much dry yeast should be poured on 0.5 liters of beer to make it attractive for beetles? a 10-gram bag of quick yeast (equivalent to 80 g of fresh yeast). descriptions of this process are not read anywhere))

yeast Saccharomycetes cerevisiae, beer "PIVA Svetlae pasteryzavanae" 4,2 %

here I have the cheapest and worst beer, dry yeast, sugar and a few meters of hunting grooves in the forest, in which I'm going to put glasses of beer. I would like to advise you how much dry yeast should be poured on 0.5 liters of beer to make it attractive for beetles? a 10-gram bag of quick yeast (equivalent to 80 g of fresh yeast). descriptions of this process are not read anywhere))

yeast Saccharomycetes cerevisiae, beer "PIVA Svetlae pasteryzavanae" 4,2 %

For 0.5 liters, no more than a tablespoon, even closer to half

And maybe just add alcohol to the beer? As a preservative?

It turns out "Baltika No. 9"

I will summarize all of the above:
1. Any bait is wonderful. The choice of bait is limited only by the imagination and opportunity of the researcher
2. As a fixative and at the same time a bait for soil traps, I use a mixture of acetic essence and saturated salt solution. They were exposed for 2.5 months.

Can you tell me if: confused: there are any traps along the way for night butterflies? It is desirable that you can do it yourself. If there is a photo, throw a description on the forum or on the soap tyomka@lianet.ru

[Here are a few images of my lepidoptera traps I have used over the past 42 years]