Dysmicoccus lavandulae Germain, Matile-Ferrero & Williams n. sp. is described and illustrated, and its DNA sequences given. The species lives on Lavandula x intermedia, the cultivated form of lavender grown in the French region of Provence. In addition the mealybug species recorded in France on indigenous lavender are listed. The status of two related genera, Trionymus Berg and Dysmicoccus Ferris, is discussed.