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

Calendar

TaxonomyBrowse
Info
ImagesLinksBooksData

Genus Efferia

Robber fly - Efferia aestuans BG1348 D0570 - Efferia aestuans - female WBC robberfly 3, right side - Efferia - female A taste of things to come - Efferia aestuans - female unknown fly in texas 4/13/13 - Efferia robber fly sp. ? - Efferia - female Efferia albibarbis - male Efferia mortensoni? - Efferia - male
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon (Orthorrhapha)
Superfamily Asiloidea
Family Asilidae (Robber Flies)
Subfamily Asilinae
Genus Efferia
Synonyms and other taxonomic changes
Treated here broadly; species-groups used in the guide are sometimes recognized as separate genera Albibarbefferia, Aridefferia, Carinefferia, Nerax, Pogonioefferia, Tuberculefferia, e.g. in(1)
Explanation of Names
Efferia Coquillett 1893
from Latin efferus 'wild, savage'
Numbers
~110 spp. in our area, 185 total(1)
Size
more or less average in size, 15 to 25-30 mm(2)
Identification
Key to eastern spp.(3), key to others(4).
Range
in our area, the vast majority are restricted to sw. US, with some widely western spp. and just two widespread spp.; Nerax predominantly southeastern(1)
Internet References