During the summers of 1970 and 1971 gypsy moth,Porthetria dispar(L.), larvae in the 3rd through 6th stadia were collected in 5 one-acre plots on Cape Cod, Mass. The collections served 2 purposes: (1) to attempt to demonstrate the establishment of 2 exotic parasitoid species and (2) to ascertain which tachinid species were successfully parasitizing the gypsy moth on Cape Cod.