Autumn-emergence
Guides
Dicosmoecus
October Caddisflies
Dicosmoecus is a genus of caddisflies in the family Limnephilidae, commonly known as October Caddisflies. The genus contains approximately six described species distributed across western North America, from California and Oregon through British Columbia to the Rocky Mountains. Species such as D. gilvipes and D. atripes are among the most intensively studied North American caddisflies due to their large larval size, synchronous autumn emergence, and importance in freshwater ecosystem research and fly-fishing culture.
Erannis vancouverensis
Vancouver Looper
Erannis vancouverensis is a geometrid moth occurring from northern British Columbia to central California. Larvae feed on young leaves of deciduous trees. Adults emerge during late autumn, with females being wingless. The species occasionally reaches infestation levels and is subject to natural population control through virus disease and tachinid fly parasitism.
Muscina pascuorum
Pasture Fly, European Scavenger Fly
Muscina pascuorum is a muscid fly native to Europe that has become established across North America. The species is closely allied to M. stabulans and M. levida. It is known to enter homes in autumn and winter, where adults accumulate on windowsills. Larvae develop in fungi, particularly woodland mushrooms, rather than in carrion or manure like many related muscids. The specific epithet 'pascuorum' refers to pastures, reflecting its original European habitat association.
Neophylax
autumn mottled sedges
Neophylax is a genus of caddisflies commonly known as autumn mottled sedges, containing more than 30 described species. Larvae are aquatic case-builders that construct protective cases using silk and materials gathered from streambeds, including sand, stones, shells, and plant material. The genus exhibits notable life history diversity, with species showing temporal and spatial segregation in stream systems. Adults typically emerge in autumn, giving rise to the common name.
Neophylax oligius
autumn sedge
Neophylax oligius, commonly known as the autumn sedge, is a North American caddisfly species in the family Uenoidae. In southern Ontario, larvae grow from late autumn through spring, with adults emerging in September and October following a summer prepupal diapause. The species occupies stream habitats and exhibits case-building behavior typical of the genus.
Phanocelia
Phanocelia is a genus of northern caddisflies in the family Limnephilidae. The genus contains one described species, Phanocelia canadensis. Larvae of this species inhabit acidic bog ponds, specifically within floating Sphagnum moss at the water margin. The life cycle is univoltine with autumnal adult emergence.
Pleocoma behrensii
rain beetle
Pleocoma behrensii is a species of rain beetle endemic to the Pacific Coast of North America. Rain beetles in this genus are known for their flightless females and their emergence during the first heavy autumn rains. The species belongs to a relict family with limited distribution and specialized ecological associations.
Pleocoma blaisdelli
rain beetle
Pleocoma blaisdelli is a rain beetle in the family Pleocomidae, described by Linsley in 1938. It is one of approximately 30 species in the genus Pleocoma, all endemic to western North America. Rain beetles are named for their habit of emerging during autumn or winter rains to mate. The species is recorded from California. Like other Pleocoma, adults are sexually dimorphic and do not feed.
Pleocoma dubitabilis leachi
Pleocoma dubitabilis leachi is a subspecies of rain beetle in the family Pleocomidae, described by Linsley in 1938. It belongs to a genus of scarab beetles endemic to western North America, commonly known for their autumn emergence following rainfall. Members of this genus are characterized by strong sexual dimorphism and fossorial habits. The subspecies designation indicates geographic variation within P. dubitabilis.
Pleocoma fimbriata
Fimbriate Rain Beetle
Pleocoma fimbriata is a species of rain beetle in the family Pleocomidae, known from California. Rain beetles are characterized by their flightless females and autumn-emerging adults that are often associated with rainfall events. The species was described by LeConte in 1856.
Pleocoma hirticollis
rain beetle
Pleocoma hirticollis is a species of rain beetle in the family Pleocomidae, a group of scarab beetles endemic to western North America. The species is active during autumn and winter rains, emerging only when soil is saturated. Three subspecies are recognized: P. h. hirticollis, P. h. reflexa, and P. h. vandykei. Like other Pleocomidae, adults are sexually dimorphic and do not feed.
Pleocoma hirticollis vandykei
Pleocoma hirticollis vandykei is a subspecies of rain beetle in the family Pleocomidae. It is one of several subspecies within the species P. hirticollis, which belongs to a genus of scarab beetles endemic to western North America. Members of Pleocoma are known for their fossorial habits and adult emergence during autumn rains. This subspecies was described by Linsley in 1938 and is currently accepted as valid.
Pleocoma hovorei
Pleocoma hovorei is a rain beetle species described in 2007. It belongs to the family Pleocomidae, a small group of scarab beetles known for their emergence during autumn rains. The species occurs in California, USA.
Pleocoma marquai
rain beetle
Pleocoma marquai is a species of rain beetle described by Hovore in 1972. It belongs to the family Pleocomidae, a small group of scarab beetles known for their emergence during autumn rains. The species is known from California and is one of approximately 30 species in the genus Pleocoma.
Pleocoma octopagina
rain beetle
Pleocoma octopagina is a species of rain beetle described by Robertson in 1970. It belongs to the family Pleocomidae, a small group of scarabaeoid beetles known for their autumn emergence following rainfall. The species occurs in California on the lower West Coast of North America.
Pleocoma oregonensis
Oregon rain beetle
Pleocoma oregonensis is a rain beetle in the family Pleocomidae, endemic to the Pacific Northwest region of North America. As with other members of this family, it exhibits autumnal emergence patterns correlated with rainfall events. The species was described by Leach in 1933 and is one of approximately 30 described species in the genus Pleocoma.
Pleocoma simi
Pleocoma simi is a rain beetle in the family Pleocomidae, described by Davis in 1934. The species is known from Oregon in the western United States. As with other Pleocoma species, adults are active during autumn rains and males fly to locate flightless females. Larval stages remain underground, feeding on roots.