Javesella dubia

Length 2.5 mm (macropters ~3.5 mm). Javesella species occur as both macropterous and brachypterous forms, and show a variety of colouration; identifications must be made with care, and separation of species is not always possible from photos. J. dubia is a very common species, which is usually brachypterous. Males are frequently much darker than females. The body is often darker than in J. pellucida, and the wing membrane distinctly brown, with the apex somewhat asymmetric. Wing length in males is typically to around the base of the genital segment, which has a straight vertical edge in side view.

Males | females

Males can be identified by external structure of the genitals at 10-20X magnification; females can only be identified by examination of internal genital structure. 

Detailed examination of the specimen is needed to identify the species.

In grassy areas, but perhaps most particularly in woodland.

Adult: May to September.

Common and widespread in Britain.

Fairly frequent in Leicestershire and Rutland.