Mayfly Species Baetis brunneicolor (Blue-Winged Rusty Dun)
Taxonomic Navigation -?-
Kingdom Animalia (Animals)
» Phylum Arthropoda (Arthropods)
» Class Insecta (Insects)
» Order Ephemeroptera (Mayflies)
» Family Baetidae (Blue-Winged Olives)
» Genus Baetis (Blue-Winged Olives)
» Species brunneicolor (Blue-Winged Rusty Dun)
Common Names
| Match | Common Name |
 | Blue-Winged Rusty Dun |
| Blue-Winged Olive |
 | BWO |
| Rusty Spinner |
| Little Blue-Winged Olive |
 | Slate-Winged Brown Quill |
| Little Slate-Winged Brown Quill |
Fly Imitations by Orvis
| Stage | Fly Pattern |
| Dun | Blue Winged Olive |
Anglers may have read in books about Baetis hiemalis, which is now a synonym (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 Baetis brunneicolor. It appears to have been a name for the fall-hatching brood of this species, which was reported to prefer slow water and weedy habitat instead of the gravelly riffles of the early summer brood.
Where & When
Regions: East, Midwest, West
Time Of Year (?): June through mid-November; best in early summer and again in the fall
Baetis brunneicolor is most often praised for the action it creates in the Midwest, but it is locally abundant in parts of the East and may occur in the West.Time Of Year (?): June through mid-November; best in early summer and again in the fall
Hatching Behavior
Time Of Day (?): Sometimes all day long; best in late afternoon to evening
The duns drift a long distance on the water before taking flight, making them excellent dry-fly insects.Nymph Biology
Current Speed: AnySubstrate: Gravel, vegetation
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