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Mayfly Species Drunella coloradensis (Small Western Green Drake)

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This species is very similar to Drunella flavilinea. In areas where their ranges overlap, they can sometimes be found in the same streams. Allen and Edmunds (1962) say that Drunella coloradensis tends to favor colder water than Drunella flavilinea and that it may emerge as much as a month later.  

Where & When


Region: West

Time Of Year (?): July to early October

Preferred Waters: Small streams

Altitude: High
According to Fred Arbona, this species requires streams which never exceed 60F, and this limits them to small streams at high altitude.

Pictures of 3 Mayfly Specimens in the Species Drunella coloradensis:


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