Chalcid Wasp Brachymeria tibialis

Caterpillar Hunter Wasp Delta dimidatipenne
Chalcid Wasps are parasitic wasps. Several species, including Brachymeria tibialis above, have a shortened abdomen and disproportionately large "thighs" (tibia). The thigh muscles are said to be used to hold open the jaws of the host caterpillar or a cut in the pupa when laying an egg. Brachymeria tibialis has recently become resident in the UK - this one on my kitchen window.

To be continued.