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This is a difficult genus and the three UK species require reference to the genitalia for accurate discrimination. C. albomarginatus is by far the most common.
The male genital segment is triangular in outline from behind, and this is the best diagnostic feature. Other features include the frons, which is dark between the inner keels (unlike C. williamsi), and perhaps the absence of dark streaks on the tibiae (this has yet to be confirmed as a useful feature). Both brachypterous and macropterous forms exist; in macropters, the veins have fine, pale hairs.
Common in a variety of grassland habitats across the UK. A common species in meadows and other grassland.
Adult: April to August
Length 2.0-4.0 mm
|Adult male: Dorset (May 2009) ©Mark Dunkling
|Adult female: Yorks (May 2008) ©Joe
||Adult female: south London (April 2007) ©Joe