The effect of light on host finding and parasitism byOoencyrtus kuvanae(Howard), an egg parasitoid of gypsy moth,Lymantria disparL., was studied in the laboratory. Parasitism byO. kuvanaefemales confined in light or dark cylinders was not significantly different. When parasites were given a choice between light or dark chambers, significantly more chose the light chamber regardless of the presence or absence of an egg mass. However, chambers were significantly more attractive when they contained an egg mass, indicating that an egg mass contributes to host location over short distances. Parasitism of egg masses in dark chambers in which noO. kuvanaewere found demonstrates that the parasite may leave these sites after oviposition. Implications for success ofO. kuvanaein low-density gypsy moth populations are discussed.