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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
Cite: 611200 with citation markup [cite:611200]
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.

Steyskal has made modificatio
Steyskal has made modifications to his key in 1973. The key to the species of Amblypsilopis as treated in Steyskal's works are compiled in my forum post here. https://bugguide.net/node/view/1621647