Beetles are easy summer trout food to overlook, but trout do not. From June into September, terrestrials - beetles, ants, hoppers - fall off bankside grass and brush, and fish hold tight to the bank waiting for them. The Foam Beetle is the simple answer: a closed-cell foam shell over a body of peacock herl or black dubbing, tied in sizes 12-18, that rides flush in the film and stays up even when you are fishing hard.
Black is the workhorse. It shows a hard, dark silhouette against the sky, which is exactly what a trout sees looking up. Peacock adds a little green-bronze flash that reads as a buggy shell. A dab of bright foam or a hi-vis post on top is just for you, so you can track a low-floating bug on the water.
Fish it tight to the bank and under overhanging brush, where real beetles drop in. It works best in water around 55-75F, in clear to lightly stained flows that are low or normal. Dead-drift it with no drag; the take is often a quiet sip, easy to miss. It also rides high enough to anchor a dry-dropper, holding a small nymph in pocket water. The same pattern takes panfish when trout are off.