Nallachiinae differs from Dilarinae in having non-homologous claspers and in structure of the vein, media anterior. Neonallachius Nakahara is referred to Dilarinae; Nulema Navás and Neodilar Carpenter are synonymized with Nallachius. No known exceptions remain to an exclusively Old World distribution for Dilarinae and a New World distribution for Nallachiinae. All New World species are listed; Nallachius americanus, N. pulchellus, N. prestoni and N. loxanus are illustrated, and the range of N. americanus is extended to Venezuela. New species are Nallachius phantomellus, N. limai, N. ovalis and N. dicolor, all from Brazil.