Tricky one! Epargyreus sp., but there are several similar ones around. Candidates are Epargyreus spina, Epargyreus aspina and Epargyreus exadeus. I slightly tend to Epyrgyreus exadeus cruza.
http://butterfliesofamerica.com/imagehtmls/Eudaminae/Epargyreus_exadeus_cruza_F_GF_MX_25-XI-04_i.htm
http://www.butterfliesandmoths.org/species/Epargyreus-exadeus
http://butterfliesofamerica.com/imagehtmls/Eudaminae/Epargyreus_exadeus_cruza-_male-24-III-06-La_Florida-TMP_i.htm
It is easier excluding than including species...
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