Terrestrial invertebrates at the ELA have been little studied and most species are unidentified. Probably the most obvious and among the most common are the biting insects, particularly the black flies (Family Simuliidae), mosquitoes (Family Culicidae) and sandflies (punkies, biting midges, or 'no-see-ums') (Family Ceratopogonidae). Members of the Family Tabanidae, particularly deer flies (Chrysops spp.) and horse flies (Tabanus spp.) are also common, as is the stable fly, Stomoxys calcitrans (Family Muscidae), which breeds in decaying vegetable matter and delivers a needle-like bite. Mosquitoes and black flies commonly are most abundant in spring. The other biting flies are typically hot weather visitors.
Many other insects with aquatic larval stages are seasonally common. These include the chironomids or midges (Chironomidae) and the mayflies (Ephemeroptera), as well as dragonflies (Odonata) and caddisflies (Tricoptera). Running water is less common in the ELA and stream insects such as stoneflies (Plecoptera), though present, are less abundant.
Among the beetles (Coleoptera), the sawyer beetle (Monochamus) was particularly common for several years following forest fires. Other commonly observed beetles include members of the ladybird beetles (Coccinellidae) and the fireflies (Lampyridae).
Butterflies and moths (Lepidoptera) commonly observed include the luna moth (Actius luna Linn.) and other large silkworm moths of the Family Saturniidae. Common butterflies include the swallowtails (Papilionidae) and the Admirals (Nymphalidae).
Vespid wasps of the subfamily Vespinae (yellowjackets and hornets) occur widely, both as ground and above-ground nesters. Bees of the Family Apidae, including bumblebees (subfamily Apinae) are also common Hymenopterans in the ELA.
Spiders, while common, are largely unidentified. Wood ticks are widespread in grassy areas. Deer ticks (Ixodes dammini), carriers of Lyme disease, are suspected to occur in the region but are, as yet, unconfirmed.