It is Ismenius. Nigrofasciatus is a South American species. The first time I have difficulties to separate Clearescens and Telchinia. Is yours a faded Heliconius ismenius telchinia or a Heliconius ismenius clarescens with a stronger marked stripe?? To be on the safe side, just add Heliconius ismenius.
http://butterfliesofamerica.com/t/Heliconius_ismenius_clarescens_a.htm
http://butterfliesofamerica.com/t/Heliconius_ismenius_telchinia_a.htm
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