Based on specimens of Zelurus ochripennis (Stål, 1854) collected in the entrance zone of a small terrestrial cave, some biological, ecological, morphological and cytogenetic data, as well, as the general morphology of their nymphs are presented for the first time. A short taxonomic summary of the species is also provided.
Keywords: Hemiptera, Neotropical region, karyotype, testicular peritoneal sheath, assassin bug, island fauna.