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Notes on southeastern North American species of Condylostylus and Sciapus (Diptera: Dolichopodidae)
By G.C. Steyskal
The Florida Entomologist, 56 (4): 359-360, 1973
Cite: 611202 with citation markup [cite:611202]
Online here.

"Additional characters to separate Condylostylus caudatus (Wiedemann) and C. graenicheri (Van Duzee) and revisions to the author's 1966 key to North American species of Sciapus are given."