Bombylius lancifer

Osten Sacken, 1877

Bombylius lancifer is a of bee fly ( Bombyliidae) found in western North America. Bee flies in this are typically active in spring and are known for their -like appearance, hovering , and parasitic larval . visit flowers for nectar, while larvae develop as in the nests of solitary bees.

Pronunciation

How to pronounce Bombylius lancifer: //bɒmˈbɪliəs ˈlænsɪfər//

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Identification

Members of the Bombylius can be distinguished from the similar genus Systoechus by the location of the r-m on the wing. Within Bombylius, B. lancifer is distinguished from the more widespread B. major and B. mexicanus by subtle morphological differences; authoritative identification requires examination of wing venation and body proportions.

Habitat

Occurs in open, sunny including sand prairies, meadows, and forest edges. are often found on or near the ground in sandy substrates, particularly in areas where solitary bees nest.

Distribution

Western North America. Records from the iNaturalist platform indicate observations primarily from the western United States and Canada.

Seasonality

Active as in spring, consistent with the seasonal pattern observed in other Bombylius .

Diet

feed on nectar from flowers using their elongated . Larvae are parasitic, developing in the nests of solitary bees where they feed externally on larvae.

Host Associations

  • Solitary bees (Andrenidae, Colletidae, Halictidae) - larval Larvae parasitize nests of ground-nesting solitary bees, attaching externally to developing larvae

Life Cycle

Females deposit near or into burrows, sometimes hovering and flicking eggs into nest entrances. Larvae hatch and locate host , attaching to bee larvae and feeding externally as . occurs in the soil, with emerging the following spring. Some in the may pass two winters in the pupal stage.

Behavior

are strong, agile fliers capable of sustained hovering. They are skittish and difficult to approach closely. Males may hover in place as territorial or .

Ecological Role

contribute to pollination through flower visitation. Larvae function as agents of solitary , though this may also impact native bee .

Human Relevance

Harmless to humans and pets. are sometimes mistaken for bees due to their appearance, or feared as blood-suckers due to their long , but they do not bite or sting. May be noticed by naturalists and photographers in spring.

Similar Taxa

  • Bombylius majorLarger, more widespread with similar appearance and ; occurs across North America, Europe, and temperate Asia
  • Bombylius mexicanusSimilar spring activity period and general ; distinguished by subtle differences in wing venation and body proportions
  • Systoechus spp.Similar -like appearance but typically active in fall rather than spring; distinguished by r-m position on wing

More Details

Taxonomic note

Bombylius lancifer was described by Osten Sacken in 1877. Some sources list it as a synonym, but GBIF treats it as an accepted .

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Sources and further reading