Reinstated on the British list by Tony Irwin, 2016 who differentiates it from Ch. pallida. Workers should re-examine Ch. pallida specimens.
Amendment of records thus re-identified is not possible on online databases (NBN Atlas, GBIF) hence my use of GIS-produced maps on this site. If I receive such amendments to records previously submitted I will correct those
Records were specified by Irwin only in terms of locations within Vice Counties - hence the peculiar map.
Keys: Shatalkin & Merz, 2010 & Wang, 1988
Collin, 1944 (who first suggested that this was the same as Ch. pallida)
Shatalkin & Merz, 2010: MALE Head: Antenna with postpedicel yellow, rarely with a narrow or wide brownish dorsal margin. Arista rather long setulose (as in Hennig, 1941, fig. 19, right illustration); Palpus yellow. Thorax: Mesonotum yellow, with a medial and a pair of lateral brown to black, narrow to wide stripes which may be conspicuous or more or less reduced or even almost absent. Subscutellum at least medially brown to black. Katepisternum yellow or with brown spot of various size. Male terminalia: Aedeagus rather narrow, triangular. Paramere with four large teeth (figs 6-7).
Also see Irwin, 2016
Roháček et al. 2016: Largely unknown. Adults occur in June and July in Switzerland, from lowland to about 1600 m (Shatalkin & Merz 2010). The specimens examined were collected in June, from low vegetation in forested and (less frequently) open habitats.