Drunella flavilinea (Flav's)

Overview: The Drunella flavilinea, commonly referred to as Flav, Lesser Green Drake, or Small Western Green Drake, is a smaller cousin to the more famous Green Drake. Found in cold, clear rivers and streams of the western United States, these mayflies are prized for their reliable summer hatches. With their olive bodies, lighter highlights, and semi-translucent wings, Flavs provide anglers with exceptional dry fly fishing opportunities during their emergence.

Nymph Stage: Flav nymphs are robust clingers, measuring around 1/4" to 1/2" in size. Their bodies are olive to dark brown with stout legs and gills suited for fast-moving water. Hook sizes 12–16 are ideal for imitating these nymphs. Drift nymph patterns through riffles and runs, allowing them to tumble naturally along the bottom. A slight twitch can mimic their movements and provoke strikes.

Adult Stage: Adult Flavs are approximately 1/4" to 1/2" in length, with olive-green to yellowish bodies and light gray wings. Dry fly patterns tied on hook sizes 12–16 match their profile perfectly. They hatch during late morning to early afternoon, particularly on cloudy days, offering excellent fishing. Trout feed eagerly on the duns as they struggle to escape the water’s surface, so a careful presentation in riffles and seams is key. Spinner falls often occur in the evening, extending opportunities for dry fly action.