Ok, please do not try this without checking it out first. Here is my story. I had this problem more then once. The first time I got these crawly threadlike things in my soil (ie. Last summer), I ended up throwing out my Thanksgiving Cactus. So last November, I purchased a few more Thanksgiving Cactus from the supermarket. I noticed those pesky tiny fruit flies/knats flying around my plants. ( they usually lay their eggs in the soil ) Well that was it! I mixed a combo of rubbing alcohol and water and sprayed the surface of the dirt on my newly purchased plants really well. I have knat/fruit fly traps all over...ie.. Near each plant. For the first time since the Fall, I recently saw the first little bugger and put out my traps. I may do my alcohol/ water spray again. But this is risky. It did not kill my plants, but it can kill them if you overdo this. Proceed at your own risk. Best to try to control this problem. I do not think you can completely avoid it if you have live plants in the home. They LOVE organic soil and there may be unhatched eggs in the organic soil you buy at the garden center to transplant your thanksgiving cactus into a new pot in the Spring. So far I have NOT transplanted anything. Nor have I fertilized anything. These tiny fruit flies/knats come in through screens or with your groceries/fruit that you buy at your local supermarket. They can even come up out of the drain in your sink! I have added photos of these traps. They work well so far for me. You can purchase them at Home Depot or True Value Hardware.

Yes, I took a better look and I am about 99% sure that is the Picture Wing Fly. The odd mouth shape and the unique wings identify it. Both flying ants and termites have a different body shape and head than your bug. If you'd like to see more pictures of the Picture Wing Fly, follow the link below to Bugguide.net, a great resource for identifying insects. Bellatrix Here is a link that might be useful: Picture Wing Fly

It's a butterfly. Two things confirm this: the wings are folded up above the head at rest (moths typically do not do this, with some exceptions); and the antennae end in clubs. This individual appears most likely to be an Orange Sulfur or a Clouded Sulfur. Jeff

Kinda like this? Here is a link that might be useful: big bug