Key to Cephaloleia basalis species-group 1 Anterior corners of pronotum strongly projecting anteriad. Antennomere I simple. Vertex sparsely and moderately densely punctate, not impressed. Elytra strongly convex, lateral impressions on disc deep.................................................................................... 2 – Anterior corners of pronotum barely projecting anteriad. Antennomere I with a small acute tip projecting anteriad on verntral side. Vertex coarsely and densely punctate, distinctly impressed. Elytra moderately convex, lateral impressions on disc shallow............................................................................................................ C. jataiensis (Pic, 1923) 2 Base of elytra with large common red patch. Pronotum narrower, 1.3× as wide as long. Vertex strongly shiny, only with macropunctation and micropunctation........................................................................................................................... C. basalis (Weise, 1910) – Elytra uniformly pitch black. Pronotum broader, 1.5× as wide as long. Vertex somewhat opaque due to microreticulation.......................................... C. impressa Uhmann, 1930

Published as part of Sekerka, Lukáš, 2017, Taxonomic changes within Imatidiini and Hybosispini (Coleoptera: Chrysomelidae: Cassidinae), pp. 351-380 in Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) (Acta. Ent. Mus. Natl. Pragae) 57 (2) on page 361, DOI: 10.1515/aemnp-2017-0081, http://zenodo.org/record/5316262