Tachinid parasites of the gypsy moth, Lymantria dispar, with keys to adults and puparia.
Although biological control of Lymantria dispar (L.) has been studied in the north-eastern United States for the past 70 years, and with greatly renewed interest in recent years, no comprehensive keys to the parasites of the moth have been available. In this paper, keys to the adults and puparia of the species of Tachinidae that parasitise the moth are presented. All the important exotic species and all introduced species are dealt with, whether or not they are presently known to be established. Also included are important species that attack the closely related L. obfuscata Wlk. from India, some of which have already been introduced, and North American species that have been reared from L. dispar, even though they may be only of minor importance. The keys, supplemented by illustrations and by a glossary of technical terms, have been designed for use by both professionals and laymen. Moderately detailed descriptions of 34 species are followed by concise summaries of the distribution, taxonomy, morphology of the immature stages, biology, and hosts of each species, and its history and status as a parasite of L. dispar, with special reference to North America. Palexorista disparis sp. n., originally reared from L. obfuscata in northern India, is described by Sabrosky. In a final section, notes are given on 47 species that are minor and incidental parasites of L. dispar but whose names may be encountered in the literature.