Five Heteroptera from Arizona/New Mexico are reported new to the United States: Pronotacantha armata Štusák [Berytidae], Tominotus hogenhoferi (Signoret) [Cydnidae], and Calocorisca tenera Distant, Fulvius atratus Distant, and Macrolophus saileri Carvalho [Miridae]. Reviews of the pertinent literature, distribution records, and known host information are provided and color habitus images and diagnoses of each species are presented to facilitate identification.