Toni said:@sooby That link was very interesting. 
Glad it was useful. It does rule out hornworms since your pupa doesn't have the "jug handle" proboscis. Apparently there are some Sphingidae that don't have this so can't rule out the family altogether I guess. I also don't think we can rule out cutworm/armyworm (Noctuidae) relatives just yet either. Did you happen to keep the pupa in captivity? If not I guess we'll never know.........
