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Nesting and mating behaviours and the development time of Ammophila clavus (Fabricius), Ammophila globifrontalis Q.Li & Ch.Yang, and Ammophila laevigata F.Smith from Vietnam are presented. All three dig their nests in the ground. The nest entrance is round. The nest burrow is nearly vertical and ends with an elliptical cell. The cell contains 1–2 caterpillars. The egg is usually glued on the third abdominal segment of prey. The three wasps temporarily close their nest burrows just below the entrance when provisioning, but permanently close them above or at the nest cells when full provision is complete. As the last stage of nest construction, the nest entrance is camouflaged with small sticks and several pebbles. Males of both Ammophila clavus and Ammophila laevigata patrol nesting areas, pursue females searching for their nest sites, pounce upon them, and mate with them on the ground. The development time from egg to the emergence of adult wasps is more than one month, males always emerging before females. The nesting behaviour of the three Ammophila species is compared and discussed. [ABSTRACT FROM AUTHOR]