Five species of Oochoristica, Oochoristica osheroffi, Oochoristica gracewileyae, Oochoristica whitentoni, and 2 new species described herein have strobilae longer than 200 mm, many secondary ovarian lobes, and testes extending anteriorly to midovarian level. A combination of 3 characters distinguishes the 5 species from each other. Oochoristica osheroffi has an average of 68 testes per proglottid, ovarian lobes wider than long, and osmoregulatory canals not forming an anastomosing plexus; O. gracewileyae has an average of 113 testes per proglottid, ovarian lobes longer than wide, and osmoregulatory canals not forming an anastomosing plexus; O. whitentoni has an average of 125 testes per proglottid, ovarian lobes wider than long, and osmoregulatory canals forming an anastomosing plexus; a new species in Ctenosaura similis from Costa Rica has an average of 62 testes per proglottid, ovarian lobes longer than wide, and osmoregulatory canals forming an anastomosing plexus; and a new species in Ctenosaura pectinata from Mexico has an average of 122 testes per progottid, ovarian lobes longer than wide, and osmoregulatory canals forming an anastomosing plexus. Oochoristica gracewileyae differs from the other 4 species by having genital pores 10-15% rather than 25-35% of proglottid length from the anterior end and by having convoluted rather than straight or sinuous transverse osmoregulatory canals. The new species from Mexico differs from the other 4 species and apparently from all described species of Oochoristica thus far by possessing darkly staining granules throughout the parenchyma of the scolex.