12 mm to tail, 11 mm to body
5 centimeters to wingtip
Small (6-7 mm), short wings, dark black/brown body with some orange/brown showing. I'm guessing this is a male Capniidae.
Seen on a rock in a very small brook - first order stream.
Stonefly, size 16.Olive/yellow
Stonefly, size 16
Yellow sally Stonefly size 18 or so
dark body, large (Size 8-10) saw two or three.
PLE Perlidae Perlesta
PLE Perlidae Attaneuria ruralis
This looked like a yellow sally stonefly in the air, but upon closer inspection, it's really green! I'm guessing Chloroperlidae. There were several yellowish stoneflies flying about that evening, not sure if this is the only species represented. It's the only one I got this close to. About a size 167-18 (6-7 mm). 3 dark dots on head.
I also saw a large stonefly (size 8 or so - about 13 mm) laying eggs on the water - a golden stonefly? and size 12 or 14 (10 mm) brownish body, dark tan wings (briefly caught it, but it got away) over the water; a good number of size 12-14 grey caddis flying upstream; a few large (size 12?) mayfly spinners (reddish-brown body, somewhat lighter thorax. could these be Isonychia?); a few Ephemerella dorothea (I'm guessing, didn't capture any) duns over the water; and a few Maccaffertium spinners (see observation for that).
I think this may be chloroperlidae. Do the 3 dark dots on the head suggest an ID? About a size 16-18 (6-7 mm), mostly yellow, some brownish markings on head, thorax, abdomen (under wings).
One small yellow stonefly (Yellow Sally, about a size 18) flying over stream side foliage.
Plecoptera unidentified. Rock Creek Park, Washington, DC, USA. 31 May 2014.
I'm guessing this is perlidae, not sure. Dark body with yellow markings, particularly on underside of thorax. Deeply veined wings.
Yellow stonefly, some brain markings on back. Note 3 dark dots on head. Are these indicative of genus Sweltsa? I see similar markings on a recent Sweltsa observation by Mike Cole http://www.inaturalist.org/observations/729094 . These marks differ from the U or V shape marks on Isoperlahttp://www.inaturalist.org/observations/729095.
Notice egg sac under the wings.
Plecoptera, unidentified. Rock Creek Park, Washington, DC, USA. 25 May 2014.