» Species occidentalis (Gray Drake)
Common Names
This is the main Western species of Siphlonurus, and probably the most productive species of that genus in America. Where & WhenRegion: West
Time Of Year (?): April to October; peaking in August and September
Altitude: 3,000 to 5,000 feet
This species most abundant in the late summer and early fall when few other mayflies are on the water. Its activity may last few months in a single location. There's a good chart in Knopp and Cormier's Mayflies: An Angler's Study of Trout Water Ephemeroptera detailing where and when to find this species.Hatching BehaviorThe emergence is relatively unimportant because the duns usually cawl out onto shore to hatch, but shallow nymphs may be effective when this activity is at its peak.Spinner BehaviorTime Of Day: Mid-morning or evening
The spinners are the most important stage of this hatch.
Pictures of 8 Mayfly Specimens in the Species Siphlonurus occidentalis:
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