Papilionidae, Heraclides sp., early instal I would say. It is either Heraclides thoas autocles or Heraclides cresphontes. I slightly would tend to Heraclides thoas. Maybe Keith can confirm?
http://www.butterfliesofamerica.com/L/heraclides_thoas_autocles_immatures2.htm
http://www.butterfliesofamerica.com/L/heraclides_cresphontes_immatures2.htm
http://www.butterfliesofamerica.com/L/heraclides_cresphontes.htm
http://www.butterfliesofamerica.com/L/heraclides_thoas_autocles.htm
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