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The Mexican bean beetle, Epilachna val'ivestis Muls., was found on lima beans at Montalvo, Ventura County; California, in July 1946. This was the first known infestation of this pest on the Pacific coast. Armitage (1947) gives an account of its occurrence and details of the suppressive measures undertaken by the California Department of Agriculture and by Ventura County. At the request of the California Department of Agriculture the writer was assigned, on December 1, 1946, to undertake studies on the hibernation of the Mexican bean beetIe and the wild host plants of the insect in Ventura County. The studies were made in cooperation with the California Department of Agriculture and the Ventura County Agricultural Commission and were continued until August 1, 1947. The study of the wild host plants, particularly of the pea family, indigenous to Ventura County was included in order to determine their