Upper Delaware river insects, Epeorus vitreus, Orange Sulphur, insect identification fly fishing.

Epeorus vitreus
Order Ephemeroptera
Family Heptageniidae
Genus Epeorus
Species vitreus

Aquatic insect, Epeorus vitreus, Orange Sulphur, insect identification, upper, Delaware, river, fly fishing, identification, mayflies, caddisflies, stoneflies.
Epeorus vitreus

Pronounced - e p or us - vit re us

Common Name - Orange Sulphur

Size
Hook - 12, 14, 16
Millimeter - 9 to 12

Nymph
Body Color - Pale Tanish Olive
Tails - 2

Dun
Body Color - Male Pale Olive, Female Oliveish Orange
Wing Color - Light Dun
Tails - 2

Spinner
Body Color - Pale Creamy Olive
Wing Color - Clear
Tails - 2

   Epeorus nymphs are clingers preferring fast moving riffles and require clean, pollution free water. Biologist use these nymphs as an indicator of a streams water quality. Vitreus males are a size smaller than the females. The male body color is very pale creamy olive, while the female body color is oliveish orange. Epeorus vitreus hatch twice a season early June, and again in September.


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