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

See Moth submissions from National Moth Week 2023

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

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 Stomoxys calcitrans - Stable Fly

unknown Fly - Stomoxys calcitrans Stable Fly with parasites - Stomoxys calcitrans - female Small Fly- red eyes - Stomoxys calcitrans Unknown Fly - Stomoxys calcitrans Stable Fly - Stomoxys calcitrans Fly - Stomoxys calcitrans stable fly - Stomoxys calcitrans - female Stable Fly - Stomoxys calcitrans
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon (Calyptratae)
Superfamily Muscoidea
Family Muscidae (House Flies and kin)
Subfamily Muscinae
Tribe Stomoxyini (Blood-feeding Muscidae)
Genus Stomoxys
Species calcitrans (Stable Fly)
Other Common Names
Beach Fly, Dog Fly, Lawn-mower Fly(1)
Adults 5-7 mm(1)
closely resembles the common housefly (Musca domestica) but has a broader abdomen and can be identified by four characteristic longitudinal stripes across the thorax + several dark dorsal spots on the abdomen. The proboscis is black, long, and thin.
larvae & pupae have uniquely shaped triangular, widely spaced spiracles(1)
native to Eurasia & Africa, probably introduced into the New World during the colonial times(1)
larvae in decaying fibrous materials (straw bedding, wet hay/grass clippings, algal mats), cattle manure, soil mixed with manure and/or partially composted bedding, by-products of crop processing, etc.(1)
Adults of both sexes feed on blood during daytime; host specificity is low (mainly cattle and horses); the fully fed fly is sluggish and remains motionless near the host (Bishop 1913; Janovy & Roberts 2000)
Larvae feed on fecal materials and decaying organic matter, such as silage, rotting hay and grass clippings
Life Cycle
eggs take 1-4 days to develop. The larval stage lasts 11-30+ days; third-instar maggots pupate for 6-20 days(2)
Works Cited
1.Medical and Veterinary Entomology
Gary Mullen, Lance Durden. 2002. Academic Press.
2.Animal Diversity Web: Phylum Arthropoda