Technical Abstract: The brown stink bug complex (Euschistus spp.) and related hemipterans are key pests of cotton, and fruit and nut crops, affecting yield quality and quanitity. In an ongoing study assessing seasonal abundance of Euschistus servus (Say) (Hempitera: Pentatomidae) and related species in Central Texas, pheromone traps situated at the interface of commercial cotton and a pecan orchard captured E. servus adults infected with nematodes. The nematodes were fourth stage infective juveniles belonging to the family Merithidae (Merithida). This report presents the first record of nematode infections by Mermithidae (Mermithida) in E. servus. Because nematodes have been used as biological control agents in many insect pest species, this report provides a foundation for future research of mermithid nematodes as potential control agents of E. servus and other related hemipteran species that overwinter in orchard floors or other ground cover.