Frons width is determined by the width of the frons (fw) directly in front of the anterior ocellus, divided the width of the anterior ocellus (ao).
	Part of: Ferguson D, Yeates D (2014) A new species of Anabarhynchus (Diptera: Therevidae) from an ocean beach in south east Victoria. Biodiversity Data Journal 2: e4016. https://doi.org/10.3897/BDJ.2.e4016