Slate-Winged Olives

This intriguing species has received a lot of attention in past angling books. Recent authors suspect that much of this credit was a case of mistaken identity, with Attenella attenuata receiving praise for the hatches of Drunella lata and Dannella simplex. Much of the credit was legitimate and accurate, but this species is no longer thought to be on par with its most popular cousins in Ephemerella and Drunella.

I have several specimens listed under this species, but I'm not positive the identification is correct.

This uncommon species may reinforce the hatches of Drunella flavilinea where they occur together.

The Flavs pick up about a week after the closely related but larger Western Green Drakes (Drunella grandis and Drunella doddsii) finish hatching on most Western waters.

Their hatches may be complemented by simultaneous hatches of two less prolific species, Drunella coloradensis and Drunella spinifera.

This species is best known for the summer morning action it creates in the East and Midwest. It is prolific but the emergence is often sporadic and sparse, which means it is often upstaged by blizzards of tiny Tricorythodes mayflies and other more concentrated hatches.

Recent taxonomic changes have served this species well, because several other popular species (Drunella cornuta, Drunella cornutella, and Drunella longicornis) are now recognized as synonyms (Synonym: A former name of a taxon, usually a species. Entomologists frequently discover that two insects originally described as different species are one in the same, and they drop one of the names. The dropped name is said to be a synonym of the remaining name. These changes take a while to trickle into the common knowledge of anglers; for example, Baetis vagans is now a synonym of Baetis tricaudatus.) of Drunella lata. The combined lata hatch now lasts for months.

Angling entomology books show several differences in hatching behavior between the former species now combined with lata. I've tried to parse these into a coherent picture here based on the geography of the old species, but I recommend consulting experienced local anglers to understand which of the many variations on lata behavior is prevalent in your area.