Hapsidophrys principis is a species of snake in the family Colubridae.McDiarmid, Roy W., Jonathan A. Campbell, and T'Shaka A. Touré, 1999. Snake Species of the World: A Taxonomic and Geographic Reference, vol. 1 It was described by George Albert Boulenger in 1906.Boulenger, G.A. (1906). Report on the reptiles collected by the late L. Fea in West Africa. Annali di Museo Civico di Storia Naturale di Genova, ser. 3, vol. 2, p. 196-216. The species occurs on the island of Príncipe in São Tomé and Príncipe, in elevations between 100 and 300 meters above sea level.
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