Fortunato Joseph (Tom) Maiolo, 63, a civil engineer with the Agency for International Development since 1962 and a resident of Potomac, was killed July 15 in a highway accident near Brighton, Ind.

Indiana state police said the accident occurred on the Indiana Toll Road when Mr. Maiolo was stung by a bee and lost control of his van, which struck a sign and turned over. Four passengers were injured. All were going to the annual meeting of the North American Conference of Separated and Divorced Catholics at Notre Dame University.

Mr. Maiolo was born in Italy. He lived in New York after coming to this country and earned a bachelor's degree in civil engineering at Manhattan College and a master's degree at Brooklyn Polytechnic Institute. He worked for private industry in this country and abroad before moving here and joining AID.

From 1962 to 1970, he was assigned to the agency's Bureau of African Affairs, where he oversaw water resources and management projects. From 1970 to 1973, he was in the Office of Engineering. From 1973 to 1976, he was regional general engineer for Central America and was stationed in Guatemala City, Guatemala. At the time of his death, he was in the Bureau for Science and Technology.

His marriage to Mary S. Maiolo ended in divorce.

Survivors include two children, Victoria Jean Putnam of Albuquerque, N.M., and Thomas Robert Maiolo of Frederick, Md.