In the present study, we redescribe and compare Cardiodactylus novaeguineae (Haan, 1842) and Cardiodactylus guttulus (Matsumura, 1913 ), completing previous descriptions and adding many information on morphology, including both male and female genitalia and forewing venation, distribution, habitat, behavior, calling, and courtship songs. A neotype series is selected for C. novaeguineae and deposited in RMNH, Leiden MNHN, Paris, AMNH, New York and SAMA, Adelaide. The male of C. guttulus is described, and the species C. boharti Otte, 2007 , is synonymised under C. guttulus.