Mayflies, Stoneflies and Caddisflies
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Pteronarcidae:    (cast skin)                       Pteronarcys sp.  (exuvium)
Potomac River
Frederick County, Maryland
April 10, 2004
Photographer:  Richard Orr
STONEFLIES:  PLECOPTERA
CADDISFLIES: TRICOPTERA
Hydropsychidae:                                       Macronema zebratum
Potomac River
Frederick County, Maryland
May 29, 2004
Photographer:  Richard Orr
Taeniopterygidae:                                      Taeniopteryx sp. (adult)
Cunningham Falls State Park
Frederick County, Maryland
March 22, 2007
Photographer:  Richard Orr
MAYFLIES:  EPHEMEROPTERA
Ephemerellidae    (larva)                               Eurylophella sp.
Bear Branch, Sugarloaf Mountain
Frederick County, Maryland
March 31, 2007
Photographer:  Richard Orr
Perlidae     (larva)                                           Eccoptura xanthenes
Bear Branch, Sugarloaf Mountain
Frederick County, Maryland
March 31, 2007
Photographer:  Richard Orr
Ephemeridae    (larvae)                                Ephemera guttulata
Cunningham Falls State Park
Hauver Branch
Frederick County, Maryland
April 22, 2007
Photographer:  Richard Orr
Heptageniidae (subimago adult)               Stenonema (Maccaffertium) vicarium (female)
Cunningham Falls State Park
Big Hunting Creek
Frederick County, Maryland
May 6, 2007
Photographer:  Richard Orr
Pteronarcidae:                                                Pteronarcys proteus (male)
Little Hunting Creek
Cunningham Falls State Park
Frederick County, Maryland
May 27, 2007
Photographer:  Richard Orr
Chloroperlidae:                                               Sweltsa onkos
Little Hunting Creek
Cunningham Falls State Park
Frederick County, Maryland
May 27, 2007
Photographer:  Richard Orr
Brachycentridae:                                      Brachycentrus nigrosoma
Potomac River
Washington County, Maryland
April 16, 2008
Photographer:  Richard Orr