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This article presents the results of a study on the biology of the cabbage stem flea beetle, Psylliodes chrysocephala L., found in East Anglia, England. From 1950 to 1958, adult cabbage stem flea beetles were found to emerge in June, feed for some weeks and then undergo a period of aestivation from late July until mid-August, when they dispersed on to young brassica crops and recommenced feeding. Oviposition started in late August or September and continued throughout the autumn into winter. Larvae were found from September until the following April and pre-pupae and pupae from February until June. The larvae were killed in the plants by a single application of gamma-BHC miscible liquid at 6 oz active ingredient per acre in 30-100 gal water.