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Species Turbopsebius diligens

Small-headed Fly? - Turbopsebius diligens Turbopsebius diligens (Osten Sacken, 1876) - Turbopsebius diligens - male Turbopsebius diligens (Osten Sacken, 1876) - Turbopsebius diligens - male Hairy Black Western Acrocerid - Turbopsebius diligens - male Hairy Black Western Acrocerid - Turbopsebius diligens - male Hairy Black Western Acrocerid - Turbopsebius diligens - male Small-headed Fly - Turbopsebius diligens - female Acrocerid? - Turbopsebius diligens
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon (Orthorrhapha)
Family Acroceridae (Small-headed Flies)
Genus Turbopsebius
Species diligens (Turbopsebius diligens)
Synonyms and other taxonomic changes
Opsebius diligens Osten Sacken 1877, Opsebius paucus Osten Sacken 1877, Opsebius hyalinus Cole 1919
Explanation of Names
Turbopsebius diligens (Osten Sacken 1877)
Identification
Body covered with dense white to orangish pile; female wings infuscated. Detailed description in(1)
can be distinguish from congeners by its western range and anal vein not reaching wing margin (either curves forward to meet the 6th vein and close the anal cell or ends well before the margin, near where it would typically curve forward towards the 6th vein)(2)

Figs. from(3)
Range
West of the Rocky Mts, BC to CA-AZ & Durango, Mexico(4)
Food
Recorded larval hosts: Hololena curta; Rualena sp.(5)
Remarks
T. diligens has a floating, undulating sort of flight and the habit of buzzing around in circles when it falls over on its back on a smooth surface, often doing this for some time before it can regain its feet; most of the time it is making a high, thin humming sound. When walking the long wings drag on the ground.(3)
Print References
Schlinger E.I. (1952). The emergence, feeding habits and host of Opsebius diligens Osten Sacken. Pan-Pacific Ent. 28: 7-12
Works Cited
1.New East Asian and American genera of the "Cyrtus-Opsebius" branch of the Acroceridae
Schlinger E.I. 1972. Pacif. Insects 14: 409-428.
2.A further contribution to the classification of the North American spider parasites of the family Acroceratidae (Diptera)
Sabrosky C.W. 1948. Am. Midl. Nat. 39: 382-430.
3.The dipterous family Cyrtidae in North America
Cole F.R. 1919. Trans. Am. Entomol. Soc. 45: 1-79.
4.Thompson F.C., Pape T., Evenhuis N.L. (2013) Systema Dipterorum, Version 1.5
5.The biology of Acroceridae (Diptera): true endoparasitoids of spiders
Schlinger E.I. 1987. In: Nentwig W. (ed.) Ecophysiology of spiders. Springer, Berlin. pp. 319-327.