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A very common species, mostly flying between late June and August (strongly peaking in late July/early August) but I have recorded this species right up to the second half of October.
This is one of a group of relatively unmarked green lacewings that require examination of the hairs on the wing to identify. Firstly eliminate the Chrysoperla spp. (see Chrysoperla carnea for details - and remember, best to check both wings in case of abnormalities). Also check there is no black spot between the antennae and the second segment of the antennae is green. You are then left with the Nineta species, the commonest of which, vittata, is large and has a long swollen basal segment of the antennae. The other Nineta species are usually large (forewing >= 16mm) and if you happen across an unusually small example the species so far recorded in Norfolk has a concave costal edge to the forewing.
Unlike the similar Cunctochrysa species, flavifrons lacks a strong pale creamy stripe down the centre of the thorax and the hairs on the costa stick out more prominently. Compared to Chrysopidia ciliata these hairs are more angled, lying at around 45 degrees to the costa whereas they're closer to straight out on ciliata. The hairs on the costal cross-veins mostly point backwards but a few may point forwards too, however these hairs don't generally overlap like they do in ciliata as they are shorter. The palps are ringed with black whereas if they're dark at all on ciliata it should only be on the outer face.
