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For Insects, Spiders & Their Kin
For the United States & Canada
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Subfamily Chrysopsinae - Deer Flies

BG1497 C9350 - Chrysops upsilon - female Another Chrysops - Chrysops vittatus - female Chrysops cf. flavidus - Chrysops - female Tabanidae: Silvius gigantulus or Stonemyia? - Silvius gigantulus - female deer fly - Chrysops lateralis - female Chrysops flavidus? - Chrysops brunneus deer fly with small clear wing windows - Chrysops - male Chrysops
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!