Oblong-elongate; yellowish or reddish; pronotal and elytral markings extremely variable. Head: medial sulcus faint; frontal horn broad, scarcely narrows to apex, truncate or slightly rounded; vertex concave between eyes, smooth; medial sulcus absent. Antennae: antennomere 1 robust, thickened, with projection on inner apical margin, flattened ventrally, projection reaches to near apex of 2; 2 cylindrical, short, 1/4 length of 3; 3 cylindrical, longest, longer than 1 and 2 combined; 4–5 subequal in length, combined subequal in length to 3; 6–7 subequal in length, each shorter than 4; 8–10 decreasing in length, wider and shorter than preceding; 11 rounded at apex; 1–10 with scattered setae, 11 setose. Pronotum: transverse; lateral margin straight, nearly parallel, converging at apex; anterior angle angulate; posterior angle acute; convex; disc impunctate; shallow depression on each side; sides deeply, sparsely punctate; pronotal length 2.0–2.4 mm (n=20); pronotal width 3.0–3.4 mm. Scutellum: smooth. Elytron: convex; lateral margin straight until exterior apical angle, then rounded; apical margin produced posteriorly to form short triangular reflexed process; suture angularly notched; suture without tooth; with 10 puncture rows plus short scutellar row of slightly impressed punctures; elytral length 7.6–11.1 mm; elytral width 4.4–5.3 mm. Venter: black. Total length: 10.0–13.7 mm. Larva. (from Maulik 1932). Total length 12–19 mm. Width 6.5–9.0 mm. Very similar to Ch. bicolor
. Finely rugose dorsally, surface slightly shining.
Larval host plants. Heliconia imbricata and Calathea insignis Peterson. Adults collected from Heliconia lathispatha; Heliconia pogonantha Cuford, Heliconia irrasa, Heliconia mariae Hook.
Comparative notes. This species can be distinguished by the angulate elytral apices, by antennomere 3 being longer than 1 and 2 combined, and by antennomere 2 being cylindrical.
Brazil, Colombia, Costa Rica, Ecuador, Guatemala, Nicaragua, Panama.
Staines CL (2009) A review of the genus Chelobasis Gray, 1832 (Coleoptera: Chrysomelidae: Cassidinae). Zootaxa 2033: 58–68.