Bimodal-phenology
Guides
Achyra occidentalis
Achyra occidentalis is a crambid moth described by Packard in 1873. It exhibits two distinct color morphs: a dark form and a pale form, with adults active during different periods of the year. The species is restricted to arid regions of the southwestern United States. Forewing length ranges from 10–12 mm.
Cuterebra fontinella
mouse bot fly
Cuterebra fontinella, commonly known as the mouse bot fly, is a New World oestrid fly that parasitizes small mammals, particularly the white-footed mouse (Peromyscus leucopus). Adults are short-lived, non-feeding, and resemble bumble bees in appearance. Females lay eggs on vegetation near host burrows; larvae enter through natural orifices or wounds, migrate internally, and develop subcutaneous warbles typically located in the inguinal region. The species exhibits bimodal seasonal activity with summer and autumn population peaks. Though primarily a rodent parasite, rare human cases of myiasis have been documented.
Drasteria eubapta
Drasteria eubapta is a moth in the family Erebidae, described by Hampson in 1926. It is known from the southwestern United States, specifically Arizona and California. Adults have a wingspan of approximately 31 mm. The species shows bimodal adult activity, with records from early spring (March–April) and early autumn (September).
Scybalistodes vermiculalis
Scybalistodes vermiculalis is a small crambid moth described by Munroe in 1964. It is known from Arizona in the southwestern United States. The species exhibits bimodal adult activity in spring and late summer. Its small size and specific epithet suggest fine, worm-like markings on the wings.