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For Insects, Spiders & Their Kin
For the United States & Canada
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Subfamily Phthiriinae

Green insect on a cosmo, sucking out nectar - Poecilognathus Fly on plum - Neacreotrichus - male Tan and yellow fly - Poecilognathus Poecilognathus - ? - Poecilognathus Neacreotrichus sp.? - Neacreotrichus - female fly Nectar-feeding fly ID - Poecilognathus - male Bombyliidae
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)
to separate the nearctic tribes(2) :
Metapleuron with micro-pubescence........Phthiriini
Metapleuron bare........Poecilognathini
per (3),
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.