Pachysphinx peninsularis Cary, 1963

Proposed as a subspecies of Pachysphinx modesta. Synonymized with Pachysphinx occidentalis as a subspecies by Brown & Donohue, 1989, J. Lepid. Soc.43: 191. Erroneously treated as a subspecies of Pachysphinx modesta by Bridges, 1993, Cat. Fam. Gen. Spec. Sphingidae of the World: VIII.18. ReSynonymized with Pachysphinx occidentalis as a subspecies by Carcasson & Heppner, 1996, Atlas Neotrop. Lepid.4B: 54. Queried as a species by Eitschberger, 2002, Neue ent. Nachr.23: 160.