Yes, very hard indeed...
I think it is a Wallengrenia sp. and most probably Wallengrenia otho, the most common one. Ranges are difficult to interpret.
I just add some links to check.
http://bugguide.net/node/view/9585/bgpage
http://tolweb.org/Wallengrenia
http://butterfliesofamerica.com/wallengrenia_o_otho.htm
Comments (3)