Tabanus catenatus

Distinguished from similar Tabanus species by its large size (19–25 mm) and geographic distribution in the eastern United States and southeastern Canada. The common name 'Chained Horse Fly' suggests pattern elements that may aid identification, though specific diagnostic features require examination of specimens. Differentiation from Tabanus atratus (black horse fly) and other large eastern Tabanus species requires careful comparison of body markings, eye patterns, and antennal structure.

Specific habitat preferences not documented in available sources. As a member of Tabanidae, likely associated with habitats near water sources where larvae develop and adults seek hosts.

Eastern United States and southeastern Canada. GBIF records include Vermont, USA.

Females are blood-feeders, requiring blood meals for egg development. Males feed on nectar and other sugar sources. Specific host animals not documented for this species.

Complete metamorphosis with egg, larval, pupal, and adult stages. Specific details for T. catenatus not documented; Tabanidae generally have aquatic or semi-aquatic larvae.

Females act as biting pests of mammals, potentially including livestock and humans. Role as pollinators possible for males through nectar feeding, though not documented for this species specifically.

Potential pest species due to blood-feeding behavior of females; large size may make bites particularly noticeable. Specific economic or medical impact not documented.

• Tabanus atratusSimilar large size (20–25 mm) and eastern North American distribution; distinguished by all-black coloration and distinctly hooked antennae in T. atratus.
• Tabanus americanusLargest North American horse fly (up to 30 mm); overlaps in range and requires size and structural comparison for differentiation.

• Tabanidae
• horse fly
• biting fly
• eastern North America
• hematophagy

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Diptera | Beetles In The Bush | Page 3