As you may have surmised from previous posts, I fish terrestrial patterns a lot, e.g., the Beetle Kebari. If a big, beefy beetle is the trout’s main course, surely an ant is dessert. I find ant patterns effective year-round, except perhaps in the dead of winter. The two ant patterns I generally use are the Flying Ant (dry) and the Hard-bodied Ant (wet).
This video demonstrates the tying of the Hard-bodied Ant, probably as easy a fly to tie as there is, and probably as effective as almost any nymph. As ants come in a variety of sizes, this pattern can be tied in any size. Generally I tie it on a standard nymph hook, sizes 16-20. It’s great as part of a dry-and-dropper rig. For variety, tie in a series of “stripes” on the black abdomen with yellow thread, and, viola’, it becomes a wasp pattern.