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The two UK Stiroma species have two keels on the frons separated throughout, as in the related Criomorphus, but the vertex and pronotum are pale. There is a pair of black spots at the lower margin of the frons.
S. affinis is separated from the rarer S. bicarinata by genitalia characteristics, although the fore-body of the latter can be substantially darker. Macropters of both species are darker
Locally common in woodland areas across the southern half of Britain, perhaps associated with Fragaria or Geum.
Adult: June to September
Length 3-3.5 mm (macropters ~4.5 mm)
male: Yorkshire (June 2010) ©Joe
(May 2010) ©Joe
female: Yorkshire (June 2010) ©Joe