We describe predation and oviposition behavior of Haplogonatopus hernandezae in hosts of different developmental stages of Tagosodes orizicolus. Oviposition attacks were less successful on older nymphs of T. orizicolus. Handling time during oviposition was higher with fifth instar nymphs than younger ones. Paralyzing, anchoring and drilling was also more time consuming in older hosts, but oviposition time was similar. When the wasp fed on a nymph instead of ovipositing, handling time did not differ regarding to host age. H. hernandezae stung the nymph repeatedly while feeding on it. Oviposition and feeding manipulation also differed in host grasping by the pincers and final manipulation. The clypeus was the host body structure the most frequently used for grasping in oviposition attacks. The particular pincer morphology of H. hernandezae facilitates the specific grasp of the clypeus and gena of T. orizicolus. Wasps carefully set nymphs back on the rice leaves after ovipositing, but manipulated nymphs on which they fed on more carelessly and often allowed them to fall.