2015 July 27, Miroslav Barták, Štěpán Kubík, “Palaearctic species of Rhamphomyia (Pararhamphomyia) anfractuosa group (Diptera, Empididae)”, in ZooKeys[1], →DOI:
Face approximately 0.20 mm long and subequally wide in middle (strongly divergent ventrally), without setae.