Superfamilies Aradoidea, Pyrrhocoroidea and Coreoidea from Puerto Rico are discussed as part of an updated account of Hemiptera: Heteroptera. In this final part, we present 48 species belonging to the three superfamilies, with six families known from Puerto Rico: Aradoidea: Aradidae (12); Pyrrhocoroidea: Largidae (1) and Pyrrhocoridae (3); and Coreoidea: Alydidae (5), Rhopalidae (7) and Coreidae (20). Taxonomic accounts presented here include synonymies, known distribution, lists of host plants and a listing of examined specimens. Taxonomical keys are also provided for the identification of all taxa included. Color plates for 43 species are included. Five species are new records for Puerto Rico: Brachyrhynchus membranaceus (F.), Leptoglossus confusus Alayo and Grillo, Eubule scutellata (Westwood), Mamurius cubanus Barber and Bruner, and Merocoris typhaeus (F.). Most species are widespread in the West Indies, with the largest number of island endemics in the Aradidae. A discussion of the origins, biodiversity, biogeography, and endemism of all Puerto Rican Pentatomomorpha is presented.