Tortoise Beetle (Charidotis abrupta), Arroyos y Esteros, Paraguay, 4-5-15

Seems to be a variable species, or could be multiple cryptic species considered as one. See below references for online examples:

biogeodb.stri.si.edu/bioinformatics/dfm/metas/view/46428

www.discoverlife.org/mp/20q?search=Charidotis&mobile=...

Done