Description and notes
Identification key and general biology are given in Morgan (1984). Kunz (1994) considers C. bicolor and C. illigeri (Wesmael 1839) to be the same species. Morgan (1984), however, separates these two names.
Only recorded from Jersey in the Channel Islands.
Overseas, the wasp occurs throughout northern, middle and eastern Europe (including Sweden, Finland, The Netherlands, Belgium, Luxembourg, France, Spain, Germany, Switzerland, Italy, Poland and Hungary).
Status (in Britain only)
This species is not regarded as scarce or threatened.
Associated with open sandy habitats such as coastal sand dunes and commons.
From the very few available records, it has been recorded during July and August and once during October.
The host is unknown.