M. sequax - http://www.flickr.com/photos/qwertyqwertyqwerty/
Micropterna sequax is a species of Caddis Fly.
This species is widespread in Britain, and can be very common at lights. This species breeds in clear streams. In Britain there are several similar species.
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M. sequax - http://www.flickr.com/photos/qwertyqwertyqwerty/
Micropterna sequax