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The genus Ribautiana is reasonably distinctive, and consists of only five UK species, which can all be separated by colour patterns. R. ulmi differs from most others in showing two black spots on the vertex, and one on the midline at the front of the pronotum; only R. debilis can also show these, and that species is distinctly smaller.
The corium-clavus boundary is marked only by a thin white vein, and not a broad white band. The scutellum can range from pale to dark, as shown here.
Although the species is characteristic of elm, it is also found quite commonly on oak, sallow, hazel and some other deciduous trees. It is known across the UK.
Adult: May to November
Length 3.5-4 mm
south London (September 2007) ©Joe
|Adult: south London (November 2008) ©Tristan Bantock||Adult:
south London (August 2007) ©Joe