Lasiocampini

Distinguished from other Lasiocampidae tribes by the combination of: dense body hair in adults, bipectinate male antennae, and larvae with well-developed lateral lappets. The genus *Lasiocampa* is the type genus and most commonly encountered representative. Similar to Malacosini but generally with more pronounced body hair and different wing venation patterns. Separation from other tribes requires examination of genitalic structures and wing venation.

Primarily associated with temperate and boreal forests, woodlands, and shrublands. Found in both deciduous and coniferous habitats depending on species. Larvae require woody host plants for development.

Holarctic distribution, with primary diversity in the Palearctic region. Extends across Europe, Asia, and North America. Some species reach into North Africa and the Middle East.

Adults are active primarily in late spring through summer, varying by latitude and elevation. Most species have a single generation per year (univoltine), with adults emerging in response to temperature and photoperiod cues.

Larvae feed on leaves of various woody plants including oaks (*Quercus*), willows (*Salix*), birches (*Betula*), and conifers such as pines (*Pinus*). Specific host associations vary by species.

• Quercus - larval food plantmultiple species
• Salix - larval food plantmultiple species
• Betula - larval food plantmultiple species
• Pinus - larval food plantconifer-feeding species

Eggs are laid in masses on host plant branches or twigs. Larvae feed gregariously in early instars, becoming solitary later. Full-grown larvae spin dense silken cocoons, often attached to branches or fallen to ground. Overwintering occurs as pupae within cocoons. Adults emerge the following season, with some species exhibiting extended diapause.

Larvae are known for their distinctive looping gait and defensive wriggling when disturbed. Early instar larvae often feed in groups, producing silken webbing. Adults do not feed; they are nocturnal and attracted to light. Females release pheromones to attract males, which have elaborate feathery antennae for detection.

Larvae function as folivores in forest ecosystems, with occasional population outbreaks causing localized defoliation. Cocoons provide microhabitat for various invertebrates. Adults serve as prey for bats and nocturnal birds.

Some species are occasional forest pests during outbreak years, though generally of minor economic importance. The dense, hairy larvae can cause urticaria (skin irritation) in sensitive individuals. Cocoons have been used historically for silk production in some regions.

• MalacosiniAnother tribe within Lasiocampidae; distinguished by less dense body hair, different larval setal patterns, and distinct wing venation
• GastropachiniRelated tribe with slug-like larvae lacking prominent lateral lappets; adults have different wing shape and venation

• Lepidoptera
• Lasiocampidae
• lappet moths
• forest insects
• folivores

• BugGuide
• iNaturalist taxon