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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


Subfamily Chrysopsinae - Deer Flies

Deer Fly - Chrysops sackeni - female unknown - Chrysops flavidus - female Deerfly - Chrysops - male Deer Fly - Chrysops - male Chrysopsinae - Deer Flies Chrysops aestuans female - Chrysops aestuans - female Fly - Chrysops vittatus - female Deer Fly  - Chrysops vittatus - male calvus/niger ventral view - Chrysops - female
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 Chrysopsinae (Deer Flies)
~120 spp. in 4 genera (90% of spp. are in Chrysops) in our area, arranged into 2 tribes, Bouvieromyiini (Merycomyia, 2 spp.) and Chrysopsini (Silvius, 11 spp. in 4 subgenera; Chrysops, ~100 spp. in 2 subgenera; and Neochrysops, 1 sp.)(1)
5-23 mm
Hind tibia (on legs) with apical spurs [cf. no spurs in Tabaninae]; 3rd segment of antenna (=flagellum) consisting of a long slender basal part (basal flagellomere) + 4 short apical flagellomeres [the other SF: Pangongiinae has flagellum divided into 7 or 8 flagellomeres].

Thus, a lateral view of the head to show antennae is most useful for identifying tabanids to subfamily
Throughout NA
Wetlands, including salt marshes.
spring to fall
Adults feed on plant nectar; females on vertebrate blood; larvae carnivorous and detritus feeders
Life Cycle
Larvae probably more than 1 year
Internet References
Tabanidae of Canada, east of the Rocky Mountains 1: Chrysopsinae and Pangoniinae. Keys to genera and species, maps, discussion...copiously illustrated with excellent images. This is a fastastic resource!