In North America, only two species of Neralsia Cameron can currently be considered valid: N. hyalinipennis Ashmead and N. incompleta Jiménez & Pujade-Villar. Claims that Neralsia nigriventris (Kieffer) and N. armata (Say) also should be considered as such are dubious. Here, four new species found in the United States and Canada are described: Neralsia ashmeadi Jiménez & Pujade-Villar sp. nov., Neralsia kiefferi Jiménez & Pujade-Villar sp. nov., Neralsia weldi Jiménez & Pujade-Villar sp. nov., and Neralsia readae Jiménez & Pujade-Villar sp. nov. Their main morphological characters are described and a key is provided so as to distinguish between these North American species.