We received an excellent photo a while ago of what a reader described as two large groupings – or “packs” – of small white worms or larvae that were formed in lines. Since we are pretty certain she found fungus gnat larvae, or more specifically what are sometimes called “fungus gnat larvae snakes,” we will refer to them only as “small white larvae,” and not hedge by writing “small white larvae or worms.” The reader found the lines of white larvae – or we suppose they are actually more like see-through larvae with black heads – on her concrete patio, and was merely wondering what they are. As we said above, they look like gnat fly larvae, so the reader’s question has technically already been answered, but below we provide a little more information about these strange configurations of creations. What exactly are fungus gnat larvae, and why do they group together to form “snakes.”