The genus Cyphonocerus is defined based on all known species, and 4 new species are described: C. melanopterus sp. nov. (China), C. nigrithorax sp. nov. (Nepal), C. sylvicola sp. nov. (China), and C. triangulus sp. nov. (China). Cyphonocerus harmandi (Nepal and India) is redescribed, and a lectotype is designated. Cyphonocerus klapperichi Pic (China) is demoted to a subspecies of C. sanguineus. A key to species worldwide and a checklist are given.