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Oncopsis species are sexually dimorphic and also rather variable; identification can be complex. The genus is distinguished from Macropsis by the striations on the pronotum, which are parallel to the hind margin.
O. tristis occurs on birch but is slightly smaller than O. flavicollis and O. subangulata. In males, there is an obvious rounded brown spot on the forewing, in the region of the m-cu cross vein (arrowed, right). The apical cells are also darkened and there is usually a dark band across the middle of the face. Females have a very short ovipositor.
A common species on birch throughout the UK.
Adult: June to September
Length 4.0-4.5 mm
|Adult male: north London (August 2008) ©Tristan Bantock
|Adult male: north London (July 2008) ©Tristan Bantock
||Adult male: north London (July 2008) ©Tristan Bantock
|Adult female: Yorks (July 2008) ©Joe Botting
||Adult female: Yorks (July 2008) ©Joe Botting