Imantimyia albiseta
Identification: Face below antennae yellow (a broad yellow central band)
Frons - (dorsal surface of head) black with triangular orange markings extending posteriorly from a wide base at the level of the antennae to an apex just beyond the ocellar triangle, these triangular markings do not meet the eye margins and may be interrupted by a diffuse black band stretching from eye to eye at a distance approximately 1/6th of the distance between the antennae and the ocellar triangle
Head profile - black in the top half, yellow in the lower half, postgenal hairs comprising only a small triangular patch of short white hairs
(Sumner, 2008)
Distribution
Europe: Countries (published), online at Fauna Europaea, Occurrences at GBIF
UK: Recording Scheme map of occurrences 2016 (verified.) Online (NBN Atlas) via Easy maps or Interactive Atlas
Chandler (1975) reports that early stages have been found in the stems of Juncus effusus