Zodioninae

Distinguished from Conopinae by the open or narrowly closed cell R4+5 in the wing (Conopinae typically have a long petiolate cell R4+5). The laterally compressed, stalked abdomen differs from the more robust, dorsoventrally flattened abdomen of Physocephala and other conopines. Males lack the elongated fore tarsi found in some Conopinae genera.

Open, sunny habitats including meadows, grasslands, forest edges, and gardens. Often found near aggregations of solitary bees and wasps, their hosts. Adults frequent flowers for nectar, particularly Asteraceae and Apiaceae.

Primarily Holarctic, with greatest diversity in North America and the Palearctic region. Absent from Australia and most of the Neotropics; limited records from southern Africa.

Adults active from late spring through summer, with peak activity in June–August in temperate regions. Phenology tracks host bee and wasp availability.

Adults feed on nectar from flowers. Larvae are endoparasitoids of adult solitary bees (primarily Andrenidae, Halictidae, Colletidae) and some wasps (Sphecidae, Pompilidae), consuming the host from within.

• Andrenidae - larval parasitoidprimary host family
• Halictidae - larval parasitoidfrequent host
• Colletidae - larval parasitoidrecorded host
• Sphecidae - larval parasitoidoccasional host

Females intercept flying hosts and forcibly oviposit into the host abdomen. Larvae develop internally, consuming host tissues; mature larvae exit through host genital chamber or body wall to pupate in soil. Typically univoltine, with pupal diapause overwinter.

Females exhibit rapid, agile flight to pursue and intercept host bees in mid-air, grappling with the host to insert eggs. Adults are diurnal and visit flowers for nectar. Males perch on vegetation and engage in aerial pursuit of females.

Significant parasitoid of solitary bees, potentially regulating host populations. Adult nectar feeding contributes to pollination of visited flowers.

Minimal direct impact. Occasionally observed by beekeepers or pollinator researchers. Of interest in studies of bee parasitoid ecology and biological control theory.

• ConopinaeOverlapping distribution and flower-visiting behavior; distinguished by wing venation (long petiolate cell R4+5) and more robust, less compressed abdomen.
• PhysocephalaLarge conopine genus with similar wasp-mimicry; differs in wing venation and abdominal shape, and typically attacks different host groups (bumble bees, honey bees, social wasps).

• parasitoid
• bee parasite
• thick-headed fly
• Diptera
• solitary bee

• BugGuide
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life