Rice weevils,Sitophilus oryzae(L.), lesser grain borers,Rhyzopertha dominica(F.), and Angoumois grain moths,Sitotroga cerealella(Olivier), discriminated among rough rice samples of the varieties ‘Colusa’, ‘Calrose’, ‘Nato’, ‘Belle Patna’, ‘Bluebelle’, and ‘Dawn’ in free-choice tests. Attractiveness was judged by the presence of adults, oviposition, and the production of F1progeny. All 3 species exhibited a definite nonpreference for ‘Dawn’. Intact hulls precluded kernel entry by rice weevils and excluded 91% of lesser grain borer larvae and 72.4% of Angoumois grain moth larvae. The different responses in free-choice tests were related to the tightness of the seed husk, but were not directly proportional to the amount of loose-hull kernels available. Unidentified factors apparently influenced the behavior of the insects. In no-choice tests with brown rice of each variety, the number of F1progeny produced did not differ significantly in any species tested.