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Blue-winged Olives

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

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Caddisfly Genus Hydatophylax (Giant Cream Pattern-Wing Sedge)

These are huge caddisflies. The larvae may be nearly an inch and a half long and build three-inch cases. Hook sizes 4-6 are appropriate for the pupae.

Where & when

Time of year : Late May to fall in the East; August to October in the West

Preferred waters: Medium to large streams

In 69 records from GBIF, adults of this genus have mostly been collected during May (45%), June (23%), April (19%), and July (7%).

In 14 records from GBIF, this genus has been collected at elevations ranging from 33 to 2740 ft, with an average (median) of 2008 ft.

Genus Range

Hatching behavior

Time of day : Morning

Trout may feed on the pupae of this genus.

Egg-Laying behavior

The egg-laying adults are not important.

Larva & pupa biology

Diet: Woody debris

Current speed: Slow

Specimens of the Caddisfly Genus Hydatophylax

1 Female Adult

Start a Discussion of Hydatophylax


Caddisfly Genus Hydatophylax (Giant Cream Pattern-Wing Sedge)

» Genus Hydatophylax (Giant Cream Pattern-Wing Sedges)
Species in Hydatophylax: Hydatophylax argus, Hydatophylax hesperus
2 species (Hydatophylax variabilis and Hydatophylax victor) aren't included.
Genus Range
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