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

Discussion, insects and people from the 2018 BugGuide 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

Photos of insects and people from the 2011 gathering in Iowa

Photos from the 2010 Workshop in Grinnell, Iowa

Photos from the 2009 gathering in Washington


Subfamily Phthiriinae

Beefly 2 - Poecilognathus unimaculatus Phthiriinae? - Acreophthiria - female Bombyliidae - Tmemophlebia-like ? - female Bomb OK male - Poecilognathus - male Poecilognathus? - Poecilognathus - male Tmemophlebia sp. - Tmemophlebia Bombyliidae -  Phthiriinae - female Poecilognathus unimaculatus
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon (Orthorrhapha)
Superfamily Asiloidea
Family Bombyliidae (Bee Flies)
Subfamily Phthiriinae
2 tribes, with 24 spp. in 6 genera in our area, ~120 spp. in 10 genera worldwide(1)
In the 1987 work of Hall & Evenhuis(2) the two nearctic tribes can be separated by:

    Metapleuron with micro-pubescence (plus genitalic characters only visible upon dissection)........Phthiriini

    Metapleuron bare (plus genitalic characters only visible upon dissection)........Poecilognathini

In the 1981 Manual of Neactic Diptera(3) key, these two tribes (referred to as subgenera Phthiria and Poecilognathus) are separated at couplet 31 by:

    Palpus short, rarely exceeding subcranial margin. R2+3 usually originating proximal to base of cell dm. Last sternite in male with small median notch.............Phthiria (Phthiria Meigen)

    Palpus extending at least as far as antennae. R2+3, originating opposite or distal to base of cell dm. Last sternite in male deeply concave on posterior margin.....Phthiria (Poecilognathus Jaennicke)
Worldwide, most diverse in NA(1)
Works Cited
1.Evenhuis N.L., Greathead D.J. (2015) World catalog of bee flies (Diptera: Bombyliidae) web site
2.Homeodactyla and Asilomorpha: Bombyliidae, Vol. 5, Part 13, in 'Flies of the Nearctic Region', edited by G. C. D. Griffiths
Jack C. Hall & Neal L. Evenhuis. 1980. E. Schweizerbartsche Verlagsbuchhandlung, Stuttgart.
3.Manual of Nearctic Diptera Volume 1
Varies for each chapter; edited by J.F. McAlpine, B.V. Petersen, G.E. Shewell, H.J. Teskey, J.R. Vockeroth, D.M. Wood. 1981. Research Branch Agriculture Canada.