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A small genus of two deltocephalines which requires careful separation from Mocydia crocea.
The two species are hard to separate, and females can be indistinguishable. The primary distinguishing feature is that the male anal tube (final abdominal segment) is much longer in M. attenuata, nearly as long as the rest of the abdomen. The presence of a dark spot in the clavus distinguishes M. attenuata (although some references state that it is present in some M. parvicauda specimens also). The facial features (below right) are shared by both, although M. parvicauda may lack the stripes and the dark patches near the eye.
Both species occur in grassy areas in southern Britain, with M. parvicauda preferring more acidic habitats.
Adult: June to November
Length 3.8-4.5 mm
|Adult: north London (April 2008) ©Tristan Bantock
|Adult: Huddersfield (Decmber 2008) ©Joe Botting
||Adult male underside, showing short anal tube: south London (November 2007) ©Joe Botting