Technical Abstract: Psocids are an emerging problem in grain storage, handling, and processing facilities in the United States. We used data from two steel bins each containing 32.6 metric tonnes of wheat to develop sampling plans for Liposcelis entomophila, L. decolor, and a mixture of the two. Taylor’s coefficients “a” (a sampling factor) and “b” (an index of aggregation) for these pests were calculated with the aid of bootstrapping. The optimal binomial sample sizes for estimating populations of these psocids at densities of less than 10 psocids/refuge were large; therefore, we recommend the use of numerical sampling within this range of densities. Numerical sampling of L. entomophila and L. decolor at densities of less than 10 psocids/refuge should not be too laborious given the low psocid numbers involved; we recommend using 20 refuges/bin. For presence-absence sampling of L. entomophila or L. decolor, 20 refuges/bin should be used at densities of 10 or more psocids/refuge. In a mixed infestation, we suggest that only numerical sampling be used because the lowest binomial sample size for densities of 10 or more psocids/refuge is 66 refuges/bin, and this is not practical. The sampling plans we have developed based on the use of cardboard refuges are convenient for use in steel bins containing wheat because they are inexpensive, provide a rapid assessment of psocid population incidence, and are easy to implement. These sampling plans can be used to monitor populations of and the efficacy of management strategies used against L. entomophila and L. decolor.