Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Upcoming Events

Photos of insects and people from the 2022 BugGuide gathering in New Mexico, July 20-24

National Moth Week was July 23-31, 2022! See moth submissions.

Photos of insects and people from the Spring 2021 gathering in Louisiana, April 28-May 2

Photos of insects and people from the 2019 gathering in Louisiana, July 25-27

Photos of insects and people from the 2018 gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Previous events


Species Hybomitra difficilis

BG718 C7333 - Hybomitra difficilis - female BG853 C7874 - Hybomitra difficilis - female Striped Eyes - Hybomitra difficilis - female Striped Eyes - Hybomitra difficilis - female Deer/Horse Fly? - Hybomitra difficilis Horse Fly - Hybomitra difficilis - female Unknown Tabanid - Hybomitra difficilis Unknown Tabanid - Hybomitra difficilis
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon (Orthorrhapha)
Infraorder Tabanomorpha
Family Tabanidae (Horse and Deer Flies)
Subfamily Tabaninae (Horse Flies)
Tribe Tabanini
Genus Hybomitra
Species difficilis (Hybomitra difficilis)
Explanation of Names
Hybomitra difficilis (Wiedemann 1828)
~13 mm(1)
Eyes apparently bare; subcallus denuded & shining(1)
e US (VT-FL to IL-OK)(1)(2)
May-Jul in WV(3)
Drees et al.(3) regard it as common, and a serious pest; Pechuman et al.(1) consider it generally uncommon, but sometimes locally abundant.
Works Cited
1.The Diptera, or true flies, of Illinois I. Tabanidae
Pechuman, L.L., D.W. Webb, & H.J. Teskey. 1983. Illinois Natural History Survey Bulletin 33: 1-121.
2.A Catalog of the Diptera of America North of Mexico
Alan Stone, et al. 1965. United States Department of Agriculture.
3.Horse flies and deer flies of West Virginia: an illustrated key (Diptera, Tabanidae)
Drees, B.M., L. Butler, and L.L. Pechuman. 1980. West Virginia University Agricultural and Forestry Experiment Station Bulletin 674.