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Subfamily Phthiriinae

Small Flys - Poecilognathus - male - female curve-billed fly - top - Tmemophlebia coquilletti - female Bee Fly - Neacreotrichus - male Winter Phthiriine - Acreophthiria - male Colorful little fly with long beak - Poecilognathus Bee Fly 7256 - Neacreotrichus - female Neacreotrichus ? Phthiriini nectar-robbing manzanita flowers - male
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.