Picture of Berlese Funnel
A berlese funnel is a device that is used to extract insects from soil and litter samples. It was invented by Antonio Berlese and later improved. by Tullgren. Basically, it uses a heat source (in this case a light bulb) to dry the sample, forcing the insects through a screen and into a jar of preserving fluid. It is a useful tool for attaining cryptic species that would otherwise evade even the most avid collector.
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Step 1: Materials

Picture of Materials
Materials; These are the materials that I used, but I just used what I had around. Please feel free to take the idea here and modify it. 
-1 gallon tractor funnel; I ordered mine through ace hardware for about $16
-Reflector light fixture (That's the only thing I know to call it. I got mine at tractor supply for  brooding chicks and quail.)  It should have a diameter equal or greater than that of the funnel, but if you find one with equal diameter it looks cleaner. The funnel and light used here both measure about 10". 
-cat litter bucket; The funnel sat well in this bucket, so I used it. Basically, you just need to suspend the funnel above the killing jar.
- 1/4" wire mesh cut to fit snugly into the funnel.
-Mid sized jar; Nothing Special.
-Clothes pin
-Some flexible wire; a few inches will suffice. 
-light bulb; I'm not sure what the best wattage of bulb is best here, so experiment. Just don't leave it alone and accidentally catch your house on fire.
I was about to write up an Instructable on the Tullgren funnel, but I'd check to see if anyone had posted one already. Lo and behold. Is the 1/4" mesh fine enough to keep soil and particulate out of your samples? I was thinking I might need to use 1/8" grid.
tuckerlancaster (author)  whiteoakart1 year ago
Probably depends on the size of your particulate. With the, 1/4" some particulate would fall through when the funnel was filled but would hold after that. 1/8" would probably work even better, I just had 1/4" on hand.
MistaStokes3 years ago
Sounds like something from minecraft lol
TheOnlyRick4 years ago
Just remember, you can make a Berlese Funnel without the killing jar!
I guess I depends what you want it for...
tuckerlancaster (author)  TheOnlyRick4 years ago
Definitely a good point. Observation of a live specimen provides far more valuable information than a preserved specimen alone. If you are collecting them alive, make sure to coat the inside lip of the jar with fluon, petroleum jelly, talc, or some other barrier to insects.
kcbford14 years ago
eltonh10114 years ago
What liquid did you put in your killing jar?
tuckerlancaster (author)  eltonh10114 years ago
Rubbing alcohol or water with a little soap in it would do, or you could rub some fluon or Vaseline on the lip of the containter, use no killing agent, and collect them alive.
I've had great success with the following formula for insects, small fish and other small critters (especially spiders). Specimens stay soft a pliable for years and photograph well in the solution due to the refractive index of the glycerine.
All available at the local drug store:

"Bug Juice"

1 part glycerine
1 part 95% isopropyl alcohol
1 part deionized water (distilled, or Britta filtered or equivalent)

I keep a pint bottle in my collection bag.
tuckerlancaster (author)  Wazzupdoc4 years ago
Does that formula preserve the coloration of the specimens? I put the springtail above in 95% isopropyl alcohol, and it promptly became a whitish color.
It seems to do a fine job on the color. Go to my Facebook page (Tim Shickley) and see the profile picture of the spider. That was in the juice for about 2-3 years before the photo was taken for a macrophotography class.
This is great ! Perfect timing. I've recently gotten into Entomophagy and I have been trying to think of a way to collect bugs in a semi-automated way, rather than spending hours sifting through the forest floor. Of course this will take a bit of modification and multiple units made to be productive enough for my needs but this instructable certainly gets my gears of imagination going. Thanks.
What are you looking to eat?
Worms,grubs,larvae,beetles. Most anything is up for grabs. Since information on this subject is scarce and scattered it's pretty much a prep and taste test for anything collected. Soon to start raising worms, crickets and mealworms/beetles, but need to expand the menu with wild harvested insects.
stouchet4 years ago
I will try to modify this for my vermicompost bin.

If you have time, would you please let usknow how it worked out for you?

tuckerlancaster (author)  stouchet4 years ago
That sounds like a great idea. Post if you get one together...
sflyte1204 years ago
Awesome!! Springtails for all!!
kennan4 years ago
A really special Instructable. Thanks.
twhaley4 years ago
I soooo need one of these!!!!
Dr.Bill4 years ago
Yes, but will it remove BedBugs ?
tuckerlancaster (author)  Dr.Bill4 years ago
Perhaps a giant one. Or, you could shred up your mattress and feed it through in batches, but somehow I don't think people would go for that...
rimar20004 years ago
Interesting, thanks for sharing it.
aeray4 years ago
This kind of obscure project is exactly why I love Instructables! Keep it up, man! I never knew such a thing existed, but now I feel compelled to build one.