The Hecuba is one of the largest mayflies of the fall, a russet-brown to mahogany-bodied dun that emerges just as October caddis activity is winding down.

The Green Drake is one of the year’s most-anticipated dry-fly hatches in the West.

The Gray Drake is a large, slate-gray mayfly that overlaps with the Western Green Drake but is more often fished as a spinner than a dun.

The Blue-Winged Olive is arguably the most important mayfly in trout fishing.