Três espécies novas de Cryptachaea Archer, 1946 são descritas e ilustradas, com base em ambos os sexos: Cryptachaea brescoviti sp. nov. de Beni, Bolívia e Bahia e Espírito Santo, Brasil; C. bonaldoi sp. nov. de Minas Gerais, Mato Grosso do Sul e Paraná e C. lisei sp. nov. de São Paulo e Rio Grande do Sul, Brasil. Sinonímias novas são propostas: Chrysso ribeirao Levi, 1962 e C. caraca Levi, 1962 com Chrysso arops Levi, 1962; Cryptachaea diamantina (Levi, 1963) com C. hirta (Taczanowski, 1873) e Cryptachaea maxima (Keyserling, 1884) com C. altiventer (Keyserling, 1884). Theridion altum Levi, 1963 é sinônimo júnior de Theridion soaresi Levi, 1963. Theridion melanosternum Mello-Leitão, 1947 é sinonimizada com Oedothorax bisignatus Mello-Leitão, 1944 e esta última espécie é removida da sinonímia de Theridion calcynatum Holmberg, 1876 e transferida para Theridion Walckenaer, 1805. Theridion tungurahua Levi, 1963 é a fêmea de Theridion fungosum Keyserling, 1884 e a espécie é transferida para Exalbidion Wunderlich, 1995. Theridion antron Levi, 1963 é a fêmea de Theridion filum Levi, 1963. Theridion nesticum Levi, 1963 é sinonimizada com Theridion teresae Levi, 1963. Theridion olaup Levi, 1963 é transferida para Kockiura Archer, 1950 e a fêmea é descrita e ilustrada pela primeira vez. Novas combinações são estabelecidas: Cryptachaea dalana (Buckup & Marques, 1991), C. triguttata (Keyserling, 1891), C. dea (Buckup & Marques, 2006), C. digitus (Buckup & Marques, 2006), C. taim (Buckup & Marques, 2006) e Parasteatoda nigrovittata (Keyserling, 1884), todas são transferidas de Achaearanea Strand, 1929. Cryptachaea rafaeli (Buckup & Marques, 1991) é transferida para Henziectypus Archer, 1946.
Three new species of Cryptachaea Archer, 1946 are described and illustrated based on males and females: Cryptachaea brescoviti sp. nov. from Beni, Bolivia and Bahia and Espírito Santo, Brazil; C. bonaldoi sp. nov. from Minas Gerais, Mato Grosso do Sul and Paraná and C. lisei sp. nov. from São Paulo and Rio Grande do Sul, Brazil. New synonymies proposed: Chrysso ribeirao Levi, 1962 and C. caraca Levi, 1962 with Chrysso arops Levi, 1962; Cryptachaea diamantina (Levi, 1963) with C. hirta (Taczanowski, 1873) and Cryptachaea maxima (Keyserling, 1884) with C. altiventer (Keyserling, 1884). Theridion altum Levi, 1963 is considered as a new synonym of Theridion soaresi Levi, 1963. Theridion melanosternum Mello-Leitão, 1947 is synonymized with Oedothorax bisignatus Mello-Leitão, 1944 and this species is removed from the synonymy with Theridion calcynatum Holmberg, 1876 and transferred to Theridion Walckenaer, 1805. Theridion tungurahua Levi, 1963 is the female of Theridion fungosum Keyserling, 1884 and the species is transferred to Exalbidion Wunderlich, 1995. Theridion antron Levi, 1963 is the female of Theridion filum Levi, 1963. Theridion nesticum Levi, 1963 is newly synonymized with Theridion teresae Levi, 1963. Theridion olaup Levi, 1963 is transferred to Kochiura Archer, 1950 and the female is described and illustrated for the first time. New combinations established: Cryptachaea dalana (Buckup & Marques, 1991), C. triguttata (Keyserling, 1891), C. dea (Buckup & Marques, 2006), C. digitus (Buckup & Marques, 2006), C. taim (Buckup & Marques, 2006) and Parasteatoda nigrovittata (Keyserling, 1884), all transferred from Achaearanea Strand, 1929. Cryptachaea rafaeli (Buckup & Marques, 1991) is transferred to Henziectypus Archer, 1946.