A survey was made of 128 infested granaries in 97 localities in California, including 4 main areas (Sacramento Valley, San Joaquin Valley, Coast, and Southern Interior) differing markedly in environmental conditions. Four main pests of stored whole grain were found as follows the granary weevil, Sitophilus granarius, the rice weevil, S. oryza, the Angoumois grain moth, Sitotroga cerealella, and the lesser grain borer, Rhyzopertha dominica. The first is the most important species in northern California, the 2d in southern California. Among the 11 secondary spp. encountered, the sawtooth grain beetle, Oryzaephilus surina-mensis, confused flour beetle, Tribolium confusum, and rust-red grain beetle, Laemophloeus ferrdugineus, were common and almost equally widespread. The rust-red flour beetle, Tribolium castaneum, and the flat grain beetle, Laemophloeus pusillus, become more abundant from north to south. 37 minor or incidental spp. were found associated with grain in the state. The majority of these are regarded as indicators of unsanitary conditions or that the grain is out of condition. A table is included comparing the frequency of occurrence of granary insects in the major California grain storage areas, and a map showing the location of the infested granaries surveyed.