The descriptive text, below the map, is from the Cornish Red Data Book (2009). The map on this web page depicts the organisms distribution and shows the records made pre-2000 and those made since.
Range & Status
Widespread but widely scattered distribution from southern England to northern Scotland; however, most post-1960 records are from the New Forest where it can be numerous.
Recorded from The Lizard from 1928 onwards, most recently from Trevassack Quarry in 1981.
Habitat & Ecology
Occurs in old woodland with gravelly streams, in which the larvae may develop. The adult flies in June and July; the females suck the blood of grazing mammals and man.
Loss of its vulnerable habitat to forestry, draining or recreational use.
Uncertain, the recent record is outside the National Nature Reserve.
I.J. Bennallick, S. Board, C.N. French, P.A. Gainey, C. Neil, R. Parslow, A. Spalding and P.E. Tompsett. eds. 2009. Red Data Book for Cornwall and the Isles of Scilly. 2nd Edition.Croceago Press.
The Cornish Red Data Book Project was led by the Cornwall and Isles of Scilly Federation for Biological Recorders (CISFBR). The full text and species accounts (minus the maps) are available on the CISFBR website.