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''Ctesias serra'', commonly known as the cobweb beetle, is a species of 
beetle
Beetles are insects that form the order Coleoptera (), in the superorder Endopterygota. Their front pair of wings are hardened into wing-cases, elytra, distinguishing them from most other insects. The Coleoptera, with about 400,000 describ ...
native to England in the family Dermestidae.
The common name relates to the habit of the larva of taking trapped insects from spiderwebs.
The preferred habitat is beneath old thick bark.
References
Dermestidae Beetles described in 1792 Taxa named by Johan Christian Fabricius {{Dermestidae-stub