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Oncopsis flavicollis Family: Cicadellidae 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.flavicollis and O.subangulata are very similar in size and general appearance. Both feed on birch and are often found together. Male: Similar to O. subangulata, but usually with strong dark markings on the face with prominent discoidal spots (arrowed below). These may be reduced in weakly pigmented specimens when separation from O. subangulata is more difficult. Female: Very variable with several colour forms, although the shape of the ovipositor is diagnostic; shorter and more curved than in O.subangulata (see below). A common type is yellow-green on the upper part of the face, forebody and anal veins, with the remainder of the forewing chestnut brown. Another type is uniformly brown. Nymphs are also very variable in colour and markings. A common species throughout Britain on birch.   Adult: May to September Length 4.5-5.5 mm
	Adult male: north London (May 2008) ©Tristan Bantock
Adult male: north London (May 2008) ©Tristan Bantock	Adult male: north London (May 2009) ©Tristan Bantock
Adult male: north London (May 2009) ©Tristan Bantock	Adult: Dorset (May 2009) ©Mark Dunkling
Adult female (brown form): London (June 2009) ©Tristan Bantock	Adult female: Berks (June 2009) ©Jonathan Michaelson
Adult female ovipositor: ©Tristan Bantock	O. flavicollis/subangulata nymph: London (May 2009) ©Tristan Bantock