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Photo#89071
Wild Olive Tortoise Beetle - Physonota alutacea

Wild Olive Tortoise Beetle - Physonota alutacea
NABA Butterfly Park, Hidalgo County, Texas, USA
October 19, 2006
Size: 10 mm
As others have suggested here, really reminds one of a trilobite. Length estimated. The host plant is Cordia boissieri (Boraginaceae), called Wild Olive, Mexican Olive, or Anacahuita. See Texas Native Plants Database.