Walker-1849
Guides
Drosophila colorata
Drosophila colorata is a species of vinegar fly in the family Drosophilidae, first described by Walker in 1849. It is recorded from the United States. The species is accepted in GBIF and NCBI taxonomic databases, though Catalogue of Life lists it as a synonym. Very little specific biological information is available for this species beyond its basic taxonomic placement and geographic occurrence.
Exorista dydas
Exorista dydas is a species of bristle fly in the family Tachinidae. It is known from North America, with records from Canada and the United States. As a member of the genus Exorista, it is presumed to be a parasitoid, though specific host associations for this species have not been documented in available sources. The species was first described by Walker in 1849 under the name Tachina dydas.
Hybos reversus
dance fly
Hybos reversus is a species of dance fly in the family Hybotidae, originally described by Francis Walker in 1849. Like other hybotids, adults are predatory and seize prey with their forelegs. The species is part of a diverse group of small, predatory flies once classified within Empididae but now recognized as a distinct family. Larval biology remains poorly documented, as is typical for most hybotid species.
Ischnomyia albicosta
Ischnomyia albicosta is a species of small fly in the family Anthomyzidae, a group of phytophagous flies associated with monocotyledonous plants. The species was described by Francis Walker in 1849. Anthomyzidae are generally slender flies with reduced wing venation, though specific diagnostic features for I. albicosta are not well documented in accessible literature.
Ornithoica vicina
Ornithoica vicina is a species of louse fly in the family Hippoboscidae, first described by Walker in 1849. This parasitic dipteran is known to infest birds, with a documented host record from the Marsh Hawk (Circus cyaneus). Louse flies in this family are obligate ectoparasites of birds and mammals, characterized by their dorsoventrally flattened bodies and reduced or absent wings in adults, adaptations that facilitate movement through host plumage or fur. The species has been recorded from multiple localities including Brazil and Hawaii.
Scatella picea
shore fly
Scatella picea is a species of shore fly in the family Ephydridae, first described by Walker in 1849 as Ephydra picea. The species is notable for its larval feeding ecology, which has been experimentally studied. Larvae feed on algae and show differential utilization efficiency across algal taxa, with notably poor ability to use blue-green algae compared to some coexisting ephydrid species.
Scoliocentra tincta
Scoliocentra tincta is a species of fly in the family Heleomyzidae, first described by Francis Walker in 1849. Members of this family are commonly known as heleomyzid flies and are generally associated with decaying organic matter. The genus Scoliocentra is distributed across the Holarctic region. Specific ecological details for S. tincta remain poorly documented.
Stenopogon californiae
Stenopogon californiae is a species of robber fly in the family Asilidae, subfamily Stenopogoninae. First described by Francis Walker in 1849, this species belongs to a genus of relatively small, predatory flies. Robber flies in this subfamily are characterized by their slender bodies and distinctive predatory behavior. Like other asilids, they are aerial predators that capture other insects in flight.