Medium-sized narrowly built flies, 2.5-7 mm long, yellow, gray or black ground color, usually with brownish-marked wings and simple legs, rarely sexual dimorph. (McAlpine 1987, Merz 1998)
Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith
