The male from Chaco, mentioned by Slater and Wilcox (1969) as variety “b” of I. lactipennis, together with four other specimens from Argentina, Brazil and Paraguay, correspond to I. nigromaculatoides Dellapé & Melo 2022
SLATER, J.A. & D.B. WILCOX. 1969.. A Revision of the genus Ischnodemus in the Neotropical Region (Hemiptera: Lygaeidae: Blissinae). Misc. Publ. Entomol. Soc. Amer. 6: 197-238.:232.
DELLAPÉ P. M. 2014. Lygaeoidea. pp. 421-438 en Biodiversidad De Artrópodos Argentinos (Volumen 3). S. Roig-Juñent, L.E. Claps y J.J. Morrone directores. Editorial INSUE - UTN, Argentina. 564 páginas.:437.
DELLAPÉ P.M. & MELO M.C. 2022. Four new species of Ischnodemus (Heteroptera, Blissidae) and additional records from Argentina. Deutsche Entomologische Zeitschrift 69(2): 283–295. https://doi.org/10.3897/dez.69.94683:285, 287, 294.
MELO, M.C., CASTRO-HUERTAS, V., MINGHETTI, E., OLIVERA, L., SERRANO, A. & DELLAPÉ, P.M. 2024. Diversity of true bugs (Insecta: Hemiptera: Heteroptera) from the El Impenetrable National Park, Argentina. Zootaxa 5424 (1): 1–43.