Road running 41:00  4.5 mi (9:07 / mi)
shoes: Brooks Adrenaline
GSFC perimeter road (skipping the last parking lot loop).
Butterflies this run:
American Lady (Vanessa virginiensis): 1
Eastern Tailed-blue (Everes comintas): 1
Eastern Tiger Swallowtail (Papilio glaucus): 1
Juvenal's Duskywing (Erynnis juvenalis): many
Eastern Pine Elfin (Callophrys niphon): 2
Duskywing sp. (??): many
Cabbage White and Clouded Sulphur: yeah, yeah, yeah.
Pretty good haul. The Pine Elfin was a great find. Same butterfly as yesterday. Its status is listed as "unknown" in Prince Georges County, MD, meaning it hasn't been seen in a long time. I sent an e-mail to the keeper of the Maryland records, and he was happy to learn that the species was alive and well in P.G.
There is another duskywing flying in the area, and I can't figure out what it is. It occurs in a different place in my regular run. More observation is necessary.