Status: Vulnerable (RDB2).
Habitat: Ancient broad-leaved pasture-woodland, parkland and forests; favours open parkland over closed-canopy woodland.
Host plant: Oaks, sometimes hawthorns.
Overwintering: Unknown, although larvae may take a year to develop fully.
Food: Adults feed on oak leaves; larvae feed on oak litter and debris in holes in boles of old oaks.
Other notes: Similar to the common C. labiatus and the rare C. exiguus. Elytra dark brown to black. Front of head black.

Status: Common and widespread.
Habitat: Various
Host plant: Various
Overwintering: Development from egg to adult takes about one year.
Food: Usually birch leaves, also pollen and the leaves of other plants.
Other notes: Similar to the rarer C. querceti and C. exiguus.

Status: Endangered (RDB1), possibly extinct. A UK Biodiversity Action Plan (UK BAP) species.
Habitat: Wetlands, especially mixed fen or fen meadow.
Host plant: Various, especially sorrels
Overwintering: Unknown, although larval diapause may occur.
Food: Possibly leaves and fruit e.g. of Common Sorrel (Rumex acetosa).
Other notes: Similar to C. querceti and the much commoner C. labiatus but the pronotum is finely longitudinally ridged rathar than being smooth (and in C. labiatus especially, very shiny). In males, the front of the head is mostly yellow with a central black stripe, or separate black marks by antennae; in C. querceti and males of C. labiatus, the front of the head is black.

Status: Vulnerable (RDB2); a UK Biodiversity Action Plan (BAP) species.
Habitat: Broad-leaved woodland, especially on wet hillsides or in areas with quaking bogs.
Host plant: Willows, alder and downy birch.
Overwintering: Unknown
Food: Leaves of host plants.
Other notes: Head black with yellow marking on the top and front. Known mainly from two areas in Perthshire and Staffordshire. The 'bothnicus' variety is entirely black or dark brown, sometimes with a yellow mark on the pronotum.

Status: Endangered (RDB1), scattered in eastern England. UK Biodiversity Action Plan (BAP) species.
Habitat: Clearings and ride margins in broad-leaved woodland on south-facing slopes, calcareous grassland/downs, moorland.
Host plant: Birches and other trees
Overwintering: Unknown
Food: Leaves of host plants. Larvae also use catkins and fallen leaves.
Other notes: Pronotum black in males, orange in females. Elytra orange-red with a fine black suture; males sometimes with an indistinct black spot on the 'shoulder' and disc. Head with the top yellow-orange, sometimes mostly black in males.