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Orthorrhapha

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A new species of Sciapus from California, with a revised key to the species of Sciapus found in America north of Mexico
By G.C. Steyskal
Proceedings of the Entomological Society of Washington 68(4): 290-294, 1966
Full title: "A new species of Sciapus from California, with a revised key to the species of Sciapus found in America north of Mexico (Diptera: Dolichopodidae)."

Online here.

A revision of the North American species of the genus Argyra Macquart, two-winged flies of the family Dolichopodidae
By Van Duzee, M. C.
Proceedings of the United States National Museum, 66(2560): 1-43, 1925

Phylogenetic revision of Ablautus Loew (Diptera: Asilidae), A preliminary results analysis
By Galbraith E.J.
Fly Times 46: 10-16, 2011
Full text
has lateral habitus photos of all the 13 described spp. (all Nearctic)

Aphoebantus and its relatives Epacmus and Eucessia (Diptera: Bombyliidae)
By Melander A.L.
Ann. Ent. Soc. Am. 43: 1-45, 1950

The Dipterous genus Dolichopus in North America
By M. C. Van Duzee, F. R. Cole, and J. M. Aldrich
United States National Museum Bulletin 116, 1921
This is the last revision of the entire genus Dolichopus in North America (it will also work in Mexico, which has no additional species). Descriptions of all species are included. The key to species was supplemented a decade later(1) to account for species described in the 1920s, but dozens more species have been described since the 1930s.

Full text via Google books

Key to Nearctic Dolichopus Latreille (Diptera)
By M. C. Van Duzee and C. H. Curran
American Museum Novitates 683 and 684, 1934
This is the last key to the entire genus Dolichopus for North America. Robinson (1964) has a key to males of Southeastern species. Stekyskal (1973) has a key to "Group B."

Full text of vol. 683 at AMNH (males)
Full text of vol. 684 at AMNH (females)

A Revision of the North American Species of the Dipterous Genus Hydrophorus
By Aldrich, J. M.
Psyche 18:45-69, 1911
Google Books link from the genus page

downloadable PDF from the publisher

A revision of the Nearctic species of Liancalus Loew (Diptera, Dolichopodidae)
By Justin B. Runyon, Richard L. Hurley
ZooKeys 483: 97-147, 2015

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