Abstract: Metaphycus parasaissetiae Zhang and Huang is a newly recorded endoparasitoid of Parasaissetia nigra(Nietner)adults.The natural parasitic rate of this wasp is about 15.68%.Its morphology,development, reproduction, survival and behavior were studied in the laboratory.At 26±1℃and 70%±5%RH,the average number of parasitoids emerged from each host was 4.5, among which 80.6%were females.Eggs in the ovaries of unmated female matured after 1 d,but the development of the eggs in a female's ovary was not consistent.It took 15 to 19 d for the wasp to complete one generation under the laboratory condition.Larval molting was not obvious.The unmated females could only produce male progeny by parthenogenesis.Unmated females could lay eggs within 24 h after eelosion and the average amount of males emerged from each host was 5.3 under the laboratory condition.The mated female adults oviposited within 24 h and the oviposition lasted 1-17 d.A mated female adult laid 3 to 76 eggs during its life span,parasitizing 1-10 hosts.Daily oviposition rate of the parasitoid was 8.2±4.0 eggs.The longevities of males and females without nutritional supplements were less than 3 d under the laboratory condition,but were prolonged with supplement of honey solution.