Laboratory studies with an introduced parasitoid,Aphelinus asychis(Walker) (Hymenoptera: Eulophidae), and one of its hosts,Schizaphis graminum(Rondani) (Homoptera: Aphididae), were conducted during the spring and summer of 1972 to determine the number of greenbugs fed upon daily by the parasitoid, number of aphids parasitized daily, preferred mummification site, daily emergence rate of the parasitoid from the mummies, sex ratio of the emergent, and longevity for the parasitoid. A total of 608 aphids was fed upon by the 20 parasitoids. A total of 4655 mummies was formed for the 20 parasitoids of which 1967 were found on the leaves, 1200 on the stems, 121 in the whorls, 172 on the sand covering the soil, and 114 on the containers. Parasitoids emerged from approximately 81% of the mummies, and approximately 56% of these were females. Mean longevity for the 20 parasitoids was 23.4 days.