The present investigation was work developed in the Laboratory of Entomology of the National University of San Martin, located in Morales' district, located toan altitude of 350 m.s.n.m.m. andan annual precipitation of 1200 mm.; with the purpose of deterrnining the biology of the predator, when this is fed with larvas of domestic fly. To begin the investigation he/she was carried out the upbringing masal of Musca it tames used as prey for the upbringing of the pentatómido Podisus sp in laboratory. To know the biology of the predator he/she was carried out 1 a series of tests, each one with five repetitions with the purpose of obtaining real data of each one of the outlined biological parameters and evaluated, beginning with the included biological cycle the five stadiums ninfales and the period of incubation; the longevity of adults for sex; the reproductive capacity expressed in number...