Antilochus coqueberti predators of each developmental stage exhibited a relatively broad prey size range against their prey Dysdercus cingulatus when a single prey individual was provided in the laboratory. On the other hand, when two prey individuals of different developmental stages were provided together for a single predator in the laboratory, younger predators tended to attack younger prey and older predators tended to attack older prey. This tendency is similar to that observed in the field. During its nymphal developmental period, the predator killed fewer prey individuals when fed older prey, and more prey individuals when fed younger prey individuals. Predators of all nymphal instars examined exhibited a Holling's type II functional response to prey density, even if the developmental stages of the prey were different. The predatory properties of the predator elucidated in this study can provide a basis for a biological control program of D. cingulatus using its specialist predator A. coqueberti.