Despite their role in virtually all forest processes, arboreal invertebrate communities in northern temperate forests are understudied, with knowledge especially lacking for non-pest invertebrates. Consequently, little is known about their habitat requirements and sensitivity to forest management. The goals of this research were to describe the arboreal invertebrate community in the Acadian spruce/fir forest, explore invertebrate associations with lichen epiphytes, and to examine the influence of harvested canopy gaps on these taxa. Sample trees were located in research areas established by the Forest Ecosystem Research Project (FERP) in the Penobscot Experimental Forest in Bradley, Maine, USA. Sample trees consisted of red maple (Acer rubrum) between 11 and 45 cm dbh, and were located either in continuous forest, or in canopy gaps harvested between 1995 and 1998. Invertebrate collections and estimation of lichen percent cover occurred along the south-facing bole of each tree at three vertical intervals (0-2m, 2-4m, and 4-6m). The most abundant invertebrate orders included Acari (mites), Collembola (springtails), Diptera (flies), Psocoptera (bark lice), and Araneae (spiders), respectively. Total invertebrate count was greater on trees located in continuous forest and at lower height intervals, and was positively associated with cyanolichen cover. Counts of Araneae, Collembola, Diptera, and Hymenoptera were greater on trees in continuous forest. Additionally, Araneae and Collembola counts were associated with an epiphyte community considered sensitive to forest management. Future efforts will focus on family-level analysis of major invertebrate orders, and may expand sample height and/or include pitfall traps.