An all-black species with bifasciate wings. Identification is not too difficult using Day (1988), but it should be noted that the captions to figures 40 and 42 are transposed. The generic name refers to the tufts of forward-pointing bristles on the maxilla of the female; these are used to pack the nest entrance with old spider silk.
Concentrated on Hampshire, Surrey and Sussex, with a few other records from further north. A record from North Wiltshire in Falk, (1991) is based on a misidentification.
Overseas, the species is found in northern and central Europe, and eastwards to central Asia (Wolf 1972).