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 Spring 2021 gathering in Louisiana, April 28-May 2

National Moth Week 2020 photos of insects and people.

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

Discussion, 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

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama


Species Toxomerus marginatus

Toxomerus marginatus ? - Toxomerus marginatus - female Toxomerus marginatus - female Toxomerus marginatus? - Toxomerus marginatus - male Milesiini? - Toxomerus marginatus - male Shortage of black on my Toxomerus - Toxomerus marginatus - male Syrphid Fly - Toxomerus marginatus - male Toxomerus - Toxomerus marginatus - male - female Hoverflies - Toxomerus marginatus - male - female
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon ("Aschiza")
Family Syrphidae (Syrphid Flies)
Subfamily Syrphinae
Tribe Toxomerini
Genus Toxomerus
Species marginatus (Toxomerus marginatus)
Other Common Names
Margined Calligrapher(1)
Explanation of Names
Toxomerus marginatus (Say 1823)
5-6 mm
larva shown in(2), fig. 33
across Canada to C. America(3)
Adults found in diverse habitats -- forests, fields, meadows, savannas, prairies, marshes, bog, fens, deserts, stream margins, and alpine areas. They are highly adaptable and can occur in very disturbed habitats(1)
Larvae prey on aphids, thrips, small caterpillars
Life Cycle

When the pupa is exposed to heat, the adults look very pale and orange, if they develop under cold conditions, they turn much darker, sometimes nearly completely black. (Comment by Martin Hauser)
very common; larvae prey on many plant pests
Males have holoptic eyes
Works Cited
1.Field Guide to the Flower Flies of Northeastern North America
Jeffrey H. Skevington and Michelle M. Locke, Andrew D. Young, Kevin Moran, William J. Crins and Stephen A. Marshall. 2019. Princeton University Press.
2.Flower Flies (Syrphidae) and other biological control agents for aphids in vegetable crops
R. Bugg et al. 2008. UC ANR Publication 8285.
3.Thompson F.C., Pape T., Evenhuis N.L. (2013) Systema Dipterorum, Version 1.5