Identification keys and hosts are given in Morgan (1984) and Archer (2003). Kunz (1994) treats this species as synonymous with C. ignita. Niehuis (2000) considers C. angustula to be a valid species consisting of two subspecies.
Cornwall to Kent and north to Cumbria and Northumberland.
Niehuis (2000) gives Norway, Finland, Denmark,The Netherlands, Belgium, Luxembourg, France, Spain, Germany, Switzerland, Italy, Poland, Czech Republic, Slovakia, Austria, Croatia,Turkey and China (Manchuria).
This coloured map is a test of a proposed new map type. Your comments welcome.