| abstract | The mite fauna of Pennsylvania conifers was surveyed from 1971 through 1973. Collections were made from 71 species of conifers growing in nurseries, ornamental plantings and woodlands throughout the state. Keys to species, brief descriptions, illustrations, distribution records, seasonal and life histories and hosts and/or prey are presented for the phytophagous families Tetranychidae and Tenuipalpidae and the predatory Phytoseiidae. Keys to family, brief descriptions, collection records and representative illustrations are included for the remaining 24 families collected during the survey. The new phytoseiid genus Heteroseiulus and new species Heteroseiulus aceris are described. Amblyseius hystrix Muma is established as a junior synonym of Fundiseius morgani (Chant). Two new combinations are proposed: Neoseiulus micmac (Chant and Hansell) and Typhlodromips nescapi (Chant and Hansell). |