Anew species of Phaneropterinae from northeastern Mexico, Pterodichopetala alfredoi n. sp., is described. P. alfredoi n. sp., may be easily separated from congeneric P. cieloi on morphological characters such as length of tegmen (shorter in P. alfredoi n. sp., leaving exposed the last abdominal tergites), male cerci composed of three processes vs two processes in P. cieloi, internal genitalia made up of two subtriangular processes, proximally and distally very produced (not so in P. cieloi), stridulatory file with ca 113 teeth (9–10 mm in length, 8–15 teeth/mm) vs P. cieloi stridulatory file ca 70 teeth (7–8 mm in length, 8–12 teeth/mm). Information on acoustic signals, ecology and distribution of P. alfredoi n. sp., is provided and discussed.