Little Iron Blue Quills

This is one of the most prolific genera of mayflies in North American trout streams. Their small size permits the growth of up to three generations per year, and they are good dry-fly insects because they often hatch in impressive numbers and the duns ride the water for a long time before taking flight.

Baetis is probably the most misidentified genus in the angler's mayfly world. Many fly anglers see anything too small to imitate with a size 16 Adams and call it Baetis. In reality, Baetis is the most prominent of several very similar abundant genera in the family Baetidae. It seems every species in the family is perpetually being reclassified, and identifying any of them, even to genus level, is difficult.

The angler who wants to be accurate has two choices. Most people call these flies "Blue-Winged Olives," a name which has lost all meaning because people apply it to several dozen species which mostly have neither blue wings nor olive bodies. It's better to just call them "little (whatever color they are) mayflies." The other good choice is to call them "Baetids," the general Latin name for members of the Baetidae family, unless you've had them scrutinized under a microscope. Most of the specimens on this site can't be keyed below the family level from the pictures. So the next time a fishing buddy identifies a little greenish mayfly from a distance as Baetis vagans, just smile and nod...

This is one of the most important species of the Baetidae family. It is distributed across the country, but most of its fame comes from excellent hatches in the West.

Diphetor hageni has two former names used in angling literature, Baetis parvus and Baetis divinctus.

Anglers used to know these mayflies by the revered name of Baetis vagans. Baetis tricaudatus was a Western species of relative obscurity, but entomologists recently discovered that it's the same species as the popular Eastern vagans. The scientific conventions guiding entomologists do not account for a name's fame among fishermen, and new or obscure species names sometimes replace our old favorites. Baetis vagans is one such casualty.

Fortunately, brown trout think like Shakespeare: A rose by any other name would smell as sweet. The rose that was vagans has lost none of its charm.