Drunella sp.

This is a mayfly in the genus Drunella. It is also known as a blue-winged olive. Mayflies in this genus are well known for being one of the most desirable prey items for trophy fish, making their annual hatches very important for fishermen. The coloration of these species ranges from brown to bright green, but are most commonly found appearing olive green. 

Order: Ephemeroptera
Family: Ephemerellidae 
Species: Drunella sp.

Photograph: © 2009 RKD Peterson
Date of Photograph: 1 August 2009
Location: Montana, Gallatin Co. (43^o37'18' N 111^o12'20")